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

[Marge Bot]

 Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC


Commits:
e48cab2a by Krzysztof Gogolewski at 2020-10-09T08:43:49-04:00
Add a flag to indicate that gcc supports -no-pie

Fixes #17919.

- - - - -


2 changed files:

- compiler/GHC/Driver/Session.hs
- docs/users_guide/phases.rst


Changes:

=====================================
compiler/GHC/Driver/Session.hs
=====================================
@@ -2232,6 +2232,8 @@ dynamic_flags_deps = [
            -- (see #15319)
            toolSettings_ccSupportsNoPie = False
          }
+  , make_ord_flag defFlag "pgmc-supports-no-pie"
+      $ noArg $ alterToolSettings $ \s -> s { toolSettings_ccSupportsNoPie = True }
   , make_ord_flag defFlag "pgms"
       (HasArg (\_ -> addWarn "Object splitting was removed in GHC 8.8"))
   , make_ord_flag defFlag "pgma"


=====================================
docs/users_guide/phases.rst
=====================================
@@ -180,6 +180,20 @@ 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:: -optcxx ⟨option⟩
     :shortdesc: pass ⟨option⟩ to the C++ compiler
     :type: dynamic



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e48cab2a57f2342891f985bcb44817e17e985275

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e48cab2a57f2342891f985bcb44817e17e985275
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