[Git][ghc/ghc][wip/romes/target-has-rts-linker] configure: Drop unused AC_PROG_CPP

[Rodrigo Mesquita (@alt-romes)]

Rodrigo Mesquita pushed to branch wip/romes/target-has-rts-linker at Glasgow Haskell Compiler / GHC


Commits:
1aea4a06 by Rodrigo Mesquita at 2023-05-12T12:10:10+01:00
configure: Drop unused AC_PROG_CPP

In configure, we were calling `AC_PROG_CPP` but never making use of the
$CPP variable it sets or reads.

The issue is $CPP will show up in the --help output of configure,
falsely advertising a configuration option that does nothing.

The reason we don't use the $CPP variable is because HS_CPP_CMD is
expected to be a single command (without flags), but AC_PROG_CPP, when
CPP is unset, will set said variable to something like `/usr/bin/gcc -E`.
Instead, we configure HS_CPP_CMD through $CC.

- - - - -


1 changed file:

- configure.ac


Changes:

=====================================
configure.ac
=====================================
@@ -330,6 +330,18 @@ if test x"$TablesNextToCode" = xYES; then
 fi
 AC_SUBST(TablesNextToCode)
 
+dnl ** Does target have runtime linker support?
+dnl --------------------------------------------------------------
+case "$target" in
+    powerpc64-*|powerpc64le-*|powerpc-ibm-aix*|s390x-ibm-linux|riscv64-*|wasm*|javascript-*|loongarch64-*)
+        TargetHasRTSLinker=NO
+        ;;
+    *)
+        TargetHasRTSLinker=YES
+        ;;
+esac
+AC_SUBST(TargetHasRTSLinker)
+
 # Requires FPTOOLS_SET_PLATFORMS_VARS to be run first.
 FP_FIND_ROOT
 
@@ -465,9 +477,6 @@ MAYBE_OVERRIDE_STAGE0([ar],[AR_STAGE0])
 dnl make extensions visible to allow feature-tests to detect them lateron
 AC_USE_SYSTEM_EXTENSIONS
 
-dnl ** figure out how to invoke the C preprocessor (i.e. `gcc -E`)
-AC_PROG_CPP
-
 # --with-hs-cpp/--with-hs-cpp-flags
 FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
 AC_SUBST([HaskellCPPCmd])



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/1aea4a06554eb85db825ecaf51911a23695d6acc

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/1aea4a06554eb85db825ecaf51911a23695d6acc
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