[Git][ghc/ghc][wip/ghc-toolchain-fixes] 6 commits: ghc-toolchain: Match CPP args with configure script

Matthew Pickering (@mpickering) gitlab at gitlab.haskell.org
Wed Jul 26 16:04:23 UTC 2023



Matthew Pickering pushed to branch wip/ghc-toolchain-fixes at Glasgow Haskell Compiler / GHC


Commits:
d06a6e02 by Matthew Pickering at 2023-07-26T17:03:49+01:00
ghc-toolchain: Match CPP args with configure script

At the moment we need ghc-toolchain to precisely match the output as
provided by the normal configure script. The normal configure script
(FP_HSCPP_CMD_WITH_ARGS) branches on whether we are using clang or gcc
so we match that logic exactly in ghc-toolchain.

The old implementation (which checks if certain flags are supported) is
better but for now we have to match to catch any potential errors in the
configuration.

Ticket: #23720

- - - - -
0dc0bcf7 by Matthew Pickering at 2023-07-26T17:03:49+01:00
configure: Fix `-Wl,--no-as-needed` check

The check was failing because the args supplied by $$1 were quoted which
failed because then the C compiler thought they were an input file.

Fixes #23720

- - - - -
be861800 by Matthew Pickering at 2023-07-26T17:03:49+01:00
configure: Add flag which turns ghc-toolchain check into error

We want to catch these errors in CI, but first we need to a flag which
turns this check into an error.

- - - - -
924a142a by Matthew Pickering at 2023-07-26T17:03:49+01:00
ci: Enable --enable-strict-ghc-toolchain-check for all CI jobs

This will cause any CI job to fail if we have a mismatch between what
ghc-toolchain reports and what ./configure natively reports. Fixing
these kinds of issues is highest priority for 9.10 release.

- - - - -
6b70f880 by Rodrigo Mesquita at 2023-07-26T17:03:49+01:00
Pass user-specified options to ghc-toolchain

The current user interface to configuring target toolchains is `./configure`.

In !9263 we added a new tool to configure target toolchains called
`ghc-toolchain`, but the blessed way of creating these toolchains is
still through configure.

However, we were not passing the user-specified options given with the
`./configure` invocation to the ghc-toolchain tool.

This commit remedies that by storing the user options and environment
variables in USER_* variables, which then get passed to GHC-toolchain.

The exception to the rule is the windows bundled toolchain, which
overrides the USER_* variables with whatever flags the windows bundled
toolchain requires to work.
We consider the bundled toolchain to be effectively the user specifying
options, since the actual user delegated that configuration work.

Closes #23678

- - - - -
0c2ba60d by Matthew Pickering at 2023-07-26T17:03:49+01:00
HACK: remove dependency on hadrian-ghci job

- - - - -


10 changed files:

- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- configure.ac
- m4/fp_cpp_cmd_with_args.m4
- m4/fp_hs_cpp_cmd_with_args.m4
- m4/fp_link_supports_no_as_needed.m4
- m4/fp_setup_windows_toolchain.m4
- m4/ghc_toolchain.m4
- utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cc.hs
- utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs


Changes:

=====================================
.gitlab/generate-ci/gen_ci.hs
=====================================
@@ -157,6 +157,7 @@ configureArgsStr bc = unwords $
   ++ ["--with-intree-gmp" | Just _ <- pure (crossTarget bc) ]
   ++ ["--with-system-libffi" | crossTarget bc == Just "wasm32-wasi" ]
   ++ ["--enable-ipe-data-compression" | withZstd bc ]
+  ++ ["--enable-strict-ghc-toolchain-check"]
 
 -- Compute the hadrian flavour from the BuildConfig
 mkJobFlavour :: BuildConfig -> Flavour
@@ -728,7 +729,7 @@ job arch opsys buildConfig = NamedJob { name = jobName, jobInfo = Job {..} }
 
     jobAllowFailure = False
     jobStage = "full-build"
-    jobNeeds = ["hadrian-ghc-in-ghci"]
+    jobNeeds = [] --["hadrian-ghc-in-ghci"]
 
 ---------------------------------------------------------------------------
 -- Job Modifiers


=====================================
.gitlab/jobs.yaml
=====================================
@@ -29,12 +29,7 @@
     },
     "dependencies": [],
     "image": null,
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -56,7 +51,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-aarch64-darwin-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi ",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "LANG": "en_US.UTF-8",
       "MACOSX_DEPLOYMENT_TARGET": "11.0",
@@ -94,12 +89,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/aarch64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -121,7 +111,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-aarch64-linux-deb10-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "aarch64-linux-deb10-validate"
     }
@@ -155,12 +145,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/i386-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -182,7 +167,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-i386-linux-deb10-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "i386-linux-deb10-validate"
     }
@@ -216,12 +201,7 @@
     },
     "dependencies": [],
     "image": null,
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -243,7 +223,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-aarch64-darwin-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi ",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "LANG": "en_US.UTF-8",
       "MACOSX_DEPLOYMENT_TARGET": "11.0",
@@ -282,12 +262,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/aarch64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -309,7 +284,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-aarch64-linux-deb10-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "aarch64-linux-deb10-validate",
       "XZ_OPT": "-9"
@@ -344,12 +319,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/aarch64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -371,7 +341,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-aarch64-linux-deb10-validate+llvm",
       "BUILD_FLAVOUR": "validate+llvm",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "aarch64-linux-deb10-validate+llvm",
       "XZ_OPT": "-9"
@@ -406,12 +376,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/i386-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -433,7 +398,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-i386-linux-deb10-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "i386-linux-deb10-validate",
       "XZ_OPT": "-9"
@@ -468,12 +433,7 @@
     },
     "dependencies": [],
     "image": null,
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -495,7 +455,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-darwin-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi ",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "LANG": "en_US.UTF-8",
       "MACOSX_DEPLOYMENT_TARGET": "10.10",
@@ -537,12 +497,7 @@
     },
     "dependencies": [],
     "image": null,
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -564,7 +519,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-freebsd13-validate",
       "BUILD_FLAVOUR": "validate",
       "CABAL_INSTALL_VERSION": "3.8.1.0",
-      "CONFIGURE_ARGS": "--with-gmp-includes=/usr/local/include --with-gmp-libraries=/usr/local/lib --with-iconv-includes=/usr/local/include --with-iconv-libraries=/usr/local/lib ",
+      "CONFIGURE_ARGS": "--with-gmp-includes=/usr/local/include --with-gmp-libraries=/usr/local/lib --with-iconv-includes=/usr/local/include --with-iconv-libraries=/usr/local/lib --enable-strict-ghc-toolchain-check",
       "GHC_VERSION": "9.4.3",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "RUNTEST_ARGS": "",
@@ -601,12 +556,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_12:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -629,7 +579,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_12-int_native-validate+fully_static",
       "BROKEN_TESTS": "ghcilink002  encoding004 T10458 linker_unload_native",
       "BUILD_FLAVOUR": "validate+fully_static",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
+      "CONFIGURE_ARGS": "--disable-ld-override --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "INSTALL_CONFIGURE_ARGS": "--disable-ld-override",
       "RUNTEST_ARGS": "",
@@ -666,12 +616,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_12:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -694,7 +639,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_12-validate",
       "BROKEN_TESTS": "encoding004 T10458 linker_unload_native",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
+      "CONFIGURE_ARGS": "--disable-ld-override --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "INSTALL_CONFIGURE_ARGS": "--disable-ld-override",
       "RUNTEST_ARGS": "",
@@ -731,12 +676,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_12:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -759,7 +699,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_12-validate+fully_static",
       "BROKEN_TESTS": "ghcilink002  encoding004 T10458 linker_unload_native",
       "BUILD_FLAVOUR": "validate+fully_static",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
+      "CONFIGURE_ARGS": "--disable-ld-override --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "INSTALL_CONFIGURE_ARGS": "--disable-ld-override",
       "RUNTEST_ARGS": "",
@@ -796,12 +736,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_17-wasm:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -823,7 +758,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_17-wasm-cross_wasm32-wasi-release+fully_static",
       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "CROSS_TARGET": "wasm32-wasi",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
@@ -860,12 +795,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_17-wasm:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -887,7 +817,7 @@
       "BIGNUM_BACKEND": "native",
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_17-wasm-int_native-cross_wasm32-wasi-release+fully_static",
       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "CROSS_TARGET": "wasm32-wasi",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
@@ -924,12 +854,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_17-wasm:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -951,7 +876,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_17-wasm-unreg-cross_wasm32-wasi-release+fully_static",
       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--enable-unregisterised --with-intree-gmp --with-system-libffi",
+      "CONFIGURE_ARGS": "--enable-unregisterised --with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "CROSS_TARGET": "wasm32-wasi",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
@@ -988,12 +913,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-centos7:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -1015,7 +935,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-centos7-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-centos7-validate",
@@ -1051,12 +971,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -1078,7 +993,7 @@
       "BIGNUM_BACKEND": "native",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-int_native-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-int_native-validate",
       "XZ_OPT": "-9"
@@ -1113,12 +1028,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -1140,7 +1050,7 @@
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       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--disable-tables-next-to-code",
+      "CONFIGURE_ARGS": "--disable-tables-next-to-code --enable-strict-ghc-toolchain-check",
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       "TEST_ENV": "x86_64-linux-deb10-no_tntc-validate",
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@@ -1175,12 +1085,7 @@
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-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1202,7 +1107,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-numa-slow-validate",
       "BUILD_FLAVOUR": "slow-validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "ENABLE_NUMA": "1",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-numa-slow-validate",
@@ -1238,12 +1143,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1265,7 +1165,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-unreg-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--enable-unregisterised",
+      "CONFIGURE_ARGS": "--enable-unregisterised --enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-unreg-validate",
       "XZ_OPT": "-9"
@@ -1300,12 +1200,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1327,7 +1222,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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       "TEST_ENV": "x86_64-linux-deb10-validate",
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@@ -1362,12 +1257,7 @@
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-    "needs": [
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-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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@@ -1389,7 +1279,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate+debug_info",
       "BUILD_FLAVOUR": "validate+debug_info",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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@@ -1424,12 +1314,7 @@
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-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1451,7 +1336,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate+llvm",
       "BUILD_FLAVOUR": "validate+llvm",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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       "TEST_ENV": "x86_64-linux-deb10-validate+llvm",
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@@ -1486,12 +1371,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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@@ -1513,7 +1393,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate+thread_sanitizer",
       "BUILD_FLAVOUR": "validate+thread_sanitizer",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-validate+thread_sanitizer",
@@ -1550,12 +1430,7 @@
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-    "needs": [
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-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1577,7 +1452,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-cross_aarch64-linux-gnu-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp",
+      "CONFIGURE_ARGS": "--with-intree-gmp --enable-strict-ghc-toolchain-check",
       "CROSS_EMULATOR": "qemu-aarch64 -L /usr/aarch64-linux-gnu",
       "CROSS_TARGET": "aarch64-linux-gnu",
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@@ -1614,12 +1489,7 @@
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-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1641,7 +1511,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-int_native-cross_javascript-unknown-ghcjs-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp",
+      "CONFIGURE_ARGS": "--with-intree-gmp --enable-strict-ghc-toolchain-check",
       "CONFIGURE_WRAPPER": "emconfigure",
       "CROSS_EMULATOR": "js-emulator",
       "CROSS_TARGET": "javascript-unknown-ghcjs",
@@ -1679,12 +1549,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1706,7 +1571,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb11-validate",
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@@ -1741,12 +1606,7 @@
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-    "needs": [
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-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
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@@ -1768,7 +1628,7 @@
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       "BUILD_FLAVOUR": "validate+boot_nonmoving_gc",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "--way=nonmoving --way=nonmoving_thr --way=nonmoving_thr_sanity",
       "TEST_ENV": "x86_64-linux-deb11-validate+boot_nonmoving_gc",
       "XZ_OPT": "-9"
@@ -1803,12 +1663,7 @@
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-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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@@ -1830,7 +1685,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb9-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb9-validate",
       "XZ_OPT": "-9"
@@ -1865,12 +1720,7 @@
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-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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     "rules": [
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         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -1892,7 +1742,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "LLC": "/bin/false",
       "OPT": "/bin/false",
       "RUNTEST_ARGS": "",
@@ -1929,12 +1779,7 @@
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-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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     "rules": [
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@@ -1956,7 +1801,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--haddock-base-url",
       "LLC": "/bin/false",
       "OPT": "/bin/false",
@@ -1994,12 +1839,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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     "rules": [
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@@ -2021,7 +1861,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-validate+debug_info",
       "BUILD_FLAVOUR": "validate+debug_info",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "LLC": "/bin/false",
       "OPT": "/bin/false",
       "RUNTEST_ARGS": "",
@@ -2058,12 +1898,7 @@
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-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
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@@ -2085,7 +1920,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-rocky8-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-rocky8-validate",
@@ -2121,12 +1956,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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     "rules": [
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@@ -2148,7 +1978,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-ubuntu18_04-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-ubuntu18_04-validate",
       "XZ_OPT": "-9"
@@ -2183,12 +2013,7 @@
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-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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     "rules": [
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@@ -2210,7 +2035,7 @@
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       "BIN_DIST_NAME": "ghc-x86_64-linux-ubuntu20_04-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-ubuntu20_04-validate",
       "XZ_OPT": "-9"
@@ -2241,12 +2066,7 @@
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-    "needs": [
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-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
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@@ -2268,7 +2088,7 @@
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       "BUILD_FLAVOUR": "validate",
       "CABAL_INSTALL_VERSION": "3.8.1.0",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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       "HADRIAN_ARGS": "--docs=no-sphinx",
       "LANG": "en_US.UTF-8",
@@ -2303,12 +2123,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
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-    ],
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@@ -2330,7 +2145,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-windows-validate",
       "BUILD_FLAVOUR": "validate",
       "CABAL_INSTALL_VERSION": "3.8.1.0",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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       "HADRIAN_ARGS": "--docs=no-sphinx",
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@@ -2369,12 +2184,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
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@@ -2396,7 +2206,7 @@
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       "BIN_DIST_NAME": "ghc-aarch64-darwin-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi ",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--hash-unit-ids --docs=no-sphinx",
       "IGNORE_PERF_FAILURES": "all",
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@@ -2436,12 +2246,7 @@
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-    "needs": [
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-        "job": "hadrian-ghc-in-ghci"
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@@ -2463,7 +2268,7 @@
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       "BIN_DIST_NAME": "ghc-aarch64-linux-deb10-release+no_split_sections",
       "BUILD_FLAVOUR": "release+no_split_sections",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--hash-unit-ids",
       "IGNORE_PERF_FAILURES": "all",
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@@ -2500,12 +2305,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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-        "job": "hadrian-ghc-in-ghci"
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       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
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       "BUILD_FLAVOUR": "release+fully_static+no_split_sections",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
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       "BROKEN_TESTS": "encoding004 T10458 linker_unload_native",
       "BUILD_FLAVOUR": "release+no_split_sections",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
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       "BUILD_FLAVOUR": "release+no_split_sections",
-      "CONFIGURE_ARGS": "",
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
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       "BUILD_FLAVOUR": "release+debug_info",
-      "CONFIGURE_ARGS": "",
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-        "job": "hadrian-ghc-in-ghci"
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       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
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-        "job": "hadrian-ghc-in-ghci"
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       "BUILD_FLAVOUR": "release+boot_nonmoving_gc",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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       "BUILD_FLAVOUR": "release+no_split_sections",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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-        "job": "hadrian-ghc-in-ghci"
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       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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@@ -3282,12 +3027,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-release+debug_info",
       "BUILD_FLAVOUR": "release+debug_info",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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@@ -3348,12 +3088,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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-        "job": "hadrian-ghc-in-ghci"
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       "BIN_DIST_NAME": "ghc-x86_64-linux-rocky8-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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@@ -3478,12 +3208,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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       "BIN_DIST_NAME": "ghc-x86_64-linux-ubuntu18_04-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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@@ -3542,12 +3267,7 @@
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       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
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@@ -3602,12 +3322,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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@@ -3629,7 +3344,7 @@
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@@ -3665,12 +3380,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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@@ -3692,7 +3402,7 @@
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       "BUILD_FLAVOUR": "release",
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@@ -3732,12 +3442,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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@@ -3800,12 +3505,7 @@
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-        "job": "hadrian-ghc-in-ghci"
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+      "CONFIGURE_ARGS": "--with-gmp-includes=/usr/local/include --with-gmp-libraries=/usr/local/lib --with-iconv-includes=/usr/local/include --with-iconv-libraries=/usr/local/lib --enable-strict-ghc-toolchain-check",
       "GHC_VERSION": "9.4.3",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "RUNTEST_ARGS": "",
@@ -3863,12 +3563,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_12:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -3891,7 +3586,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_12-validate+fully_static",
       "BROKEN_TESTS": "ghcilink002  encoding004 T10458 linker_unload_native",
       "BUILD_FLAVOUR": "validate+fully_static",
-      "CONFIGURE_ARGS": "--disable-ld-override ",
+      "CONFIGURE_ARGS": "--disable-ld-override --enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "INSTALL_CONFIGURE_ARGS": "--disable-ld-override",
       "RUNTEST_ARGS": "",
@@ -3927,12 +3622,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_17-wasm:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -3954,7 +3644,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_17-wasm-cross_wasm32-wasi-release+fully_static",
       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "CROSS_TARGET": "wasm32-wasi",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
@@ -3990,12 +3680,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_17-wasm:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "allow_failure": true,
@@ -4018,7 +3703,7 @@
       "BIGNUM_BACKEND": "native",
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_17-wasm-int_native-cross_wasm32-wasi-release+fully_static",
       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi",
+      "CONFIGURE_ARGS": "--with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "CROSS_TARGET": "wasm32-wasi",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
@@ -4054,12 +3739,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-alpine3_17-wasm:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "allow_failure": true,
@@ -4082,7 +3762,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-alpine3_17-wasm-unreg-cross_wasm32-wasi-release+fully_static",
       "BUILD_FLAVOUR": "release+fully_static",
-      "CONFIGURE_ARGS": "--enable-unregisterised --with-intree-gmp --with-system-libffi",
+      "CONFIGURE_ARGS": "--enable-unregisterised --with-intree-gmp --with-system-libffi --enable-strict-ghc-toolchain-check",
       "CROSS_TARGET": "wasm32-wasi",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
@@ -4118,12 +3798,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4145,7 +3820,7 @@
       "BIGNUM_BACKEND": "native",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-int_native-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-int_native-validate"
     }
@@ -4179,12 +3854,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "allow_failure": true,
@@ -4207,7 +3877,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-no_tntc-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--disable-tables-next-to-code",
+      "CONFIGURE_ARGS": "--disable-tables-next-to-code --enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-no_tntc-validate"
     }
@@ -4241,12 +3911,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4268,7 +3933,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-numa-slow-validate",
       "BUILD_FLAVOUR": "slow-validate",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "ENABLE_NUMA": "1",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-numa-slow-validate"
@@ -4303,12 +3968,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4330,7 +3990,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-unreg-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--enable-unregisterised",
+      "CONFIGURE_ARGS": "--enable-unregisterised --enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-unreg-validate"
     }
@@ -4364,12 +4024,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && ($CI_MERGE_REQUEST_LABELS =~ /.*IPE.*/) && (\"true\" == \"true\")",
@@ -4391,7 +4046,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--enable-ipe-data-compression",
+      "CONFIGURE_ARGS": "--enable-ipe-data-compression --enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-validate"
     }
@@ -4425,12 +4080,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4452,7 +4102,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate+debug_info",
       "BUILD_FLAVOUR": "validate+debug_info",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-validate+debug_info"
     }
@@ -4486,12 +4136,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && ($CI_MERGE_REQUEST_LABELS =~ /.*LLVM backend.*/) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4513,7 +4158,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate+llvm",
       "BUILD_FLAVOUR": "validate+llvm",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-validate+llvm"
     }
@@ -4547,12 +4192,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "allow_failure": true,
@@ -4575,7 +4215,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb10-validate+thread_sanitizer",
       "BUILD_FLAVOUR": "validate+thread_sanitizer",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "HADRIAN_ARGS": "--docs=none",
       "RUNTEST_ARGS": "",
       "TEST_ENV": "x86_64-linux-deb10-validate+thread_sanitizer",
@@ -4611,12 +4251,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb11:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4638,7 +4273,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-cross_aarch64-linux-gnu-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp",
+      "CONFIGURE_ARGS": "--with-intree-gmp --enable-strict-ghc-toolchain-check",
       "CROSS_EMULATOR": "qemu-aarch64 -L /usr/aarch64-linux-gnu",
       "CROSS_TARGET": "aarch64-linux-gnu",
       "RUNTEST_ARGS": "",
@@ -4674,12 +4309,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb11:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4701,7 +4331,7 @@
       "BIGNUM_BACKEND": "native",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-int_native-cross_javascript-unknown-ghcjs-validate",
       "BUILD_FLAVOUR": "validate",
-      "CONFIGURE_ARGS": "--with-intree-gmp",
+      "CONFIGURE_ARGS": "--with-intree-gmp --enable-strict-ghc-toolchain-check",
       "CONFIGURE_WRAPPER": "emconfigure",
       "CROSS_EMULATOR": "js-emulator",
       "CROSS_TARGET": "javascript-unknown-ghcjs",
@@ -4738,12 +4368,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb11:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(($CI_MERGE_REQUEST_LABELS =~ /.*full-ci.*/) || ($CI_MERGE_REQUEST_LABELS =~ /.*marge_bot_batch_merge_job.*/)) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && ($CI_MERGE_REQUEST_LABELS =~ /.*non-moving GC.*/) && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4765,7 +4390,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-validate+boot_nonmoving_gc",
       "BUILD_FLAVOUR": "validate+boot_nonmoving_gc",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "RUNTEST_ARGS": "--way=nonmoving --way=nonmoving_thr --way=nonmoving_thr_sanity",
       "TEST_ENV": "x86_64-linux-deb11-validate+boot_nonmoving_gc"
     }
@@ -4799,12 +4424,7 @@
     },
     "dependencies": [],
     "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-fedora33:$DOCKER_REV",
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4826,7 +4446,7 @@
       "BIGNUM_BACKEND": "gmp",
       "BIN_DIST_NAME": "ghc-x86_64-linux-fedora33-release",
       "BUILD_FLAVOUR": "release",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "LLC": "/bin/false",
       "OPT": "/bin/false",
       "RUNTEST_ARGS": "",
@@ -4858,12 +4478,7 @@
     },
     "dependencies": [],
     "image": null,
-    "needs": [
-      {
-        "artifacts": false,
-        "job": "hadrian-ghc-in-ghci"
-      }
-    ],
+    "needs": [],
     "rules": [
       {
         "if": "(\"true\" == \"true\") && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
@@ -4885,7 +4500,7 @@
       "BIN_DIST_NAME": "ghc-x86_64-windows-validate",
       "BUILD_FLAVOUR": "validate",
       "CABAL_INSTALL_VERSION": "3.8.1.0",
-      "CONFIGURE_ARGS": "",
+      "CONFIGURE_ARGS": "--enable-strict-ghc-toolchain-check",
       "GHC_VERSION": "9.4.3",
       "HADRIAN_ARGS": "--docs=no-sphinx",
       "LANG": "en_US.UTF-8",


=====================================
configure.ac
=====================================
@@ -42,6 +42,15 @@ dnl works as expected, since we're slightly modifying how Autoconf
 dnl interprets build/host/target and how this interacts with $CC tests
 test -n "$target_alias" && ac_tool_prefix=$target_alias-
 
+dnl ----------------------------------------------------------
+dnl ** Store USER specified environment variables to pass them on to
+dnl ** ghc-toolchain (in m4/ghc-toolchain.m4)
+USER_CFLAGS="$CFLAGS"
+USER_LDFLAGS="$LDFLAGS"
+USER_LIBS="$LIBS"
+USER_CXXFLAGS="$CXXFLAGS"
+
+
 dnl ----------------------------------------------------------
 dnl ** Find unixy sort and find commands,
 dnl ** which are needed by FP_SETUP_PROJECT_VERSION
@@ -171,6 +180,14 @@ AC_ARG_ENABLE(ghc-toolchain,
 )
 AC_SUBST([EnableGhcToolchain])
 
+AC_ARG_ENABLE(strict-ghc-toolchain-check,
+[AS_HELP_STRING([--enable-strict-ghc-toolchain-check],
+                [Whether to raise an error if the output of ghc-toolchain differs from configure])],
+  [FP_CAPITALIZE_YES_NO(["$enableval"], [EnableStrictGhcToolchainCheck])],
+  [EnableStrictGhcToolchainCheck=NO]
+)
+AC_SUBST([EnableStrictGhcToolchainCheck])
+
 dnl CC_STAGE0, LD_STAGE0, AR_STAGE0 are like the "previous" variable
 dnl CC, LD, AR (inherited by CC_STAGE[123], etc.)
 dnl but instead used by stage0 for bootstrapping stage1


=====================================
m4/fp_cpp_cmd_with_args.m4
=====================================
@@ -45,6 +45,7 @@ AC_ARG_WITH(cpp-flags,
       # Use whatever flags were manually set, ignoring previously configured
       # flags; and add CPP_ARGS (which will be -E if CPP_CMD was not specified)
       CPP_ARGS="$CPP_ARGS $withval"
+      USER_CPP_ARGS="$withval"
   fi
 ],
 [


=====================================
m4/fp_hs_cpp_cmd_with_args.m4
=====================================
@@ -39,6 +39,7 @@ AC_ARG_WITH(hs-cpp-flags,
           AC_MSG_WARN([Request to use $withval will be ignored])
       else
           HS_CPP_ARGS=$withval
+          USER_HS_CPP_ARGS=$withval
       fi
   ],
 [


=====================================
m4/fp_link_supports_no_as_needed.m4
=====================================
@@ -8,9 +8,9 @@ AC_DEFUN([FP_LINK_SUPPORTS_NO_AS_NEEDED],
     AC_MSG_CHECKING([whether Cc linker supports -Wl,--no-as-needed])
     echo 'int f(int a) {return 2*a;}' > conftest.a.c
     echo 'int f(int a); int main(int argc, char **argv) {return f(0);}' > conftest.b.c
-    $CC -c -o conftest.a.o conftest.a.c > /dev/null 2>&1
-    $CC -c -o conftest.b.o conftest.b.c > /dev/null 2>&1
-    if "$CC" "$$1" -Wl,--no-as-needed -o conftest conftest.a.o conftest.b.o > /dev/null 2>&1
+    $CC -c -o conftest.a.o conftest.a.c  2>&1
+    $CC -c -o conftest.b.o conftest.b.c  2>&1
+    if "$CC" ${$1:+$$1} -Wl,--no-as-needed -o conftest conftest.a.o conftest.b.o 2>&1
     then
         $1="$$1 -Wl,--no-as-needed"
         AC_MSG_RESULT([yes])


=====================================
m4/fp_setup_windows_toolchain.m4
=====================================
@@ -127,4 +127,13 @@ AC_DEFUN([FP_SETUP_WINDOWS_TOOLCHAIN],[
     MergeObjsCmd=""
     MergeObjsArgs=""
     AC_PATH_PROG([Genlib],[genlib])
+
+
+    dnl We override the USER_* flags here since the user delegated
+    dnl configuration to the bundled windows toolchain, and these are the
+    dnl options required by the bundled windows toolchain.
+    USER_CFLAGS="$CFLAGS"
+    USER_CXXFLAGS="$CXXFLAGS"
+    USER_HS_CPP_ARGS="$HaskellCPPArgs"
+    USER_LDFLAGS="$CONF_GCC_LINKER_OPTS_STAGE2"
 ])


=====================================
m4/ghc_toolchain.m4
=====================================
@@ -93,6 +93,7 @@ AC_DEFUN([FIND_GHC_TOOLCHAIN],
     # the usual system locations, including the PATH, we are just explicit when
     # calling it through configure.
     rm -f acargs
+
     echo "--triple=$target" >> acargs
     echo "--output=$1/default.target.ghc-toolchain" >> acargs
     echo "--llvm-triple=$LlvmTarget" >> acargs
@@ -107,9 +108,20 @@ AC_DEFUN([FIND_GHC_TOOLCHAIN],
     echo "--merge-objs=$MergeObjsCmd" >> acargs
     echo "--readelf=$READELF" >> acargs
     echo "--windres=$WindresCmd" >> acargs
+
     ENABLE_GHC_TOOLCHAIN_NOT_ARG([locally-executable], [$CrossCompiling])
     ENABLE_GHC_TOOLCHAIN_ARG([unregisterised], [$Unregisterised])
     ENABLE_GHC_TOOLCHAIN_ARG([tables-next-to-code], [$TablesNextToCode])
+    ENABLE_GHC_TOOLCHAIN_ARG([ld-override], [$enable_ld_override])
+    ENABLE_GHC_TOOLCHAIN_ARG([libffi-adjustors], [$UseLibffiForAdjustors])
+
+    dnl We store USER_* variants of all user-specified flags to pass them over to ghc-toolchain.
+    ADD_GHC_TOOLCHAIN_ARG([cc-opt], [$USER_CFLAGS])
+    ADD_GHC_TOOLCHAIN_ARG([cc-link-opt], [$USER_LDFLAGS])
+    ADD_GHC_TOOLCHAIN_ARG([cc-link-opt], [$USER_LIBS])
+    ADD_GHC_TOOLCHAIN_ARG([cxx-opt], [$USER_CXXFLAGS])
+    ADD_GHC_TOOLCHAIN_ARG([cpp-opt], [$USER_CPP_ARGS])
+    ADD_GHC_TOOLCHAIN_ARG([hs-cpp-opt], [$USER_HS_CPP_ARGS])
 
     INVOKE_GHC_TOOLCHAIN()
 
@@ -151,6 +163,11 @@ AC_DEFUN([VALIDATE_GHC_TOOLCHAIN],[
           In light of it, if you've spotted this difference, please report a GHC bug at
                 https://www.haskell.org/ghc/reportabug
       ])
+
+    case "$EnableStrictGhcToolchainCheck" in
+        YES)
+      AC_MSG_ERROR([Failing due to --enable-strict-ghc-toolchain-check])
+    esac
     fi
 ])
 


=====================================
utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cc.hs
=====================================
@@ -37,21 +37,7 @@ findCc :: String -- ^ The llvm target to use if Cc supports --target
 findCc llvmTarget progOpt = checking "for C compiler" $ do
     -- TODO: We keep the candidate order we had in configure, but perhaps
     -- there's a more optimal one
-    ccProgram' <- findProgram "C compiler" progOpt ["gcc", "clang", "cc"]
-
-    -- FIXME: This is a dreadful hack!
-    -- In reality, configure should pass these options to ghc-toolchain when
-    -- using the bundled windows toolchain, and ghc-toolchain should drop this around.
-    -- See #23678
-    let ccProgram = if "mingw32" `isInfixOf` llvmTarget && takeBaseName (prgPath ccProgram') == "clang"
-                    -- we inline the is-windows check here because we need Cc to call parseTriple
-         then
-           -- Signal that we are linking against UCRT with the _UCRT macro. This is
-           -- necessary on windows clang to ensure correct behavior when
-           -- MinGW-w64 headers are in the header include path (#22159).
-           ccProgram' & _prgFlags %++ "--rtlib=compiler-rt -D_UCRT"
-         else
-           ccProgram'
+    ccProgram <- findProgram "C compiler" progOpt ["gcc", "clang", "cc"]
 
     cc' <- ignoreUnusedArgs $ Cc {ccProgram}
     cc  <- ccSupportsTarget llvmTarget cc'


=====================================
utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs
=====================================
@@ -4,6 +4,7 @@ module GHC.Toolchain.Tools.Cpp (HsCpp(..), findHsCpp, Cpp(..), findCpp) where
 
 import Control.Monad
 import System.FilePath
+import Data.List(isInfixOf)
 
 import GHC.Toolchain.Prelude
 import GHC.Toolchain.Program
@@ -38,11 +39,30 @@ findHsCpp progOpt cc = checking "for Haskell C preprocessor" $ do
 -- | Given a C preprocessor, figure out how it should be invoked to preprocess
 -- Haskell source.
 findHsCppArgs :: Program -> M [String]
-findHsCppArgs cpp = withTempDir $ \dir -> do
+findHsCppArgs cpp = do
+
+  (_, stdout0, stderr0) <- readProgram cpp ["-x", "c", "/dev/null", "-dM", "-E"]
+
+  if "__clang__" `isInfixOf` stdout0 || "__clang__" `isInfixOf` stderr0
+     then return ["-undef", "-traditional", "-Wno-invalid-pp-token", "-Wno-unicode", "-Wno-trigraphs"]
+     else do
+        (_, stdout1, stderr1) <- readProgram cpp ["-v"]
+        if "gcc" `isInfixOf` stdout1 || "gcc" `isInfixOf` stderr1
+          then return ["-undef", "-traditional"]
+          else do
+            logDebug "Can't recognize your CPP program, you may need to set --with-hs-cpp-flags=FLAGS explicitly"
+            return []
+
+
+{- TODO: We want to just check which flags are accepted rather than branching on which compiler
+         we are using but this does not match what ./configure does (#23720)
+
+         When we retire configure then this more precise logic can be reinstated.
+  withTmpDir $ \dir -> do
   let tmp_h = dir </> "tmp.h"
 
       -- Werror to ensure that unrecognized warnings result in an error
-      checkFlag flag =
+  let checkFlag flag =
           checking ("for "++flag++" support") $ callProgram cpp ["-Werror", flag, tmp_h]
 
       tryFlag flag =
@@ -56,6 +76,7 @@ findHsCppArgs cpp = withTempDir $ \dir -> do
       , tryFlag "-Wno-unicode"
       , tryFlag "-Wno-trigraphs"
       ]
+      -}
 
 ----- C preprocessor -----
 



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e485d938fb36d3985571b71cd00ec09e06082cd1...0c2ba60da2991a08bdd01af9d3d267da1c9f5086

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e485d938fb36d3985571b71cd00ec09e06082cd1...0c2ba60da2991a08bdd01af9d3d267da1c9f5086
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