[Git][ghc/ghc][ghc-8.8] Add a flag to indicate that gcc supports -no-pie

[Ben Gamari]

Ben Gamari pushed to branch ghc-8.8 at Glasgow Haskell Compiler / GHC


Commits:
597df8cd by Krzysztof Gogolewski at 2020-10-19T11:40:42+02:00
Add a flag to indicate that gcc supports -no-pie

Fixes #17919.

- - - - -


2 changed files:

- compiler/main/DynFlags.hs
- docs/users_guide/phases.rst


Changes:

=====================================
compiler/main/DynFlags.hs
=====================================
@@ -3011,6 +3011,8 @@ dynamic_flags_deps = [
                                               -- Don't pass -no-pie with -pgmc
                                               -- (see Trac #15319)
                                               sGccSupportsNoPie = False})))
+  , make_ord_flag defFlag "pgmc-supports-no-pie"
+      (noArg $ alterSettings $ \s -> s { sGccSupportsNoPie = True })
   , make_ord_flag defFlag "pgms"
       (hasArg (\f -> alterSettings (\s -> s { sPgm_s   = (f,[])})))
   , make_ord_flag defFlag "pgma"


=====================================
docs/users_guide/phases.rst
=====================================
@@ -172,6 +172,20 @@ the following flags:
 
     Pass ⟨option⟩ to the C compiler.
 
+.. ghc-flag:: -pgmc-supports-no-pie
+    :shortdesc: Indicate that the C compiler supports ``-no-pie``
+    :type: dynamic
+    :category: phase-options
+
+    When ``-pgmc`` is used, GHC by default will never pass the ``-no-pie``
+    command line flag. The rationale is that it is not known whether the
+    specified compiler will support it. This flag can be used to indicate
+    that ``-no-pie`` is supported. It has to be passed after ``-pgmc``.
+
+    This flag is not neccessary when ``-pgmc`` is not used, since GHC
+    remembers whether the default C compiler supports ``-no-pie`` in
+    an internal settings file.
+
 .. ghc-flag:: -optlo ⟨option⟩
     :shortdesc: pass ⟨option⟩ to the LLVM optimiser
     :type: dynamic



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/597df8cd2ed72889c41049488e5b62168fef13f9

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/597df8cd2ed72889c41049488e5b62168fef13f9
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