[clang] 5d1b3ba - [Driver] Ignore -fno-semantic-interposition

[Fangrui Song via cfe-commits]

Author: Fangrui Song
Date: 2020-01-14T12:09:13-08:00
New Revision: 5d1b3ba687690bbb37f911f66a2c2c5f19d60032

URL: https://github.com/llvm/llvm-project/commit/5d1b3ba687690bbb37f911f66a2c2c5f19d60032
DIFF: https://github.com/llvm/llvm-project/commit/5d1b3ba687690bbb37f911f66a2c2c5f19d60032.diff

LOG: [Driver] Ignore -fno-semantic-interposition

Fedora wants to build projects with -fno-semantic-interposition (e.g.
https://fedoraproject.org/wiki/Changes/PythonNoSemanticInterpositionSpeedup),
which is supported by GCC>=5.

Clang's current behavior is similar to -fno-semantic-interposition and
the end goal is to make it more so
(https://lists.llvm.org/pipermail/llvm-dev/2016-November/107625.html).
Ignore this option.

We should let users know -fsemantic-interposition is not currently
supported, so it should remain a hard error.

Reviewed By: serge-sans-paille

Differential Revision: https://reviews.llvm.org/D72724

Added: 
    

Modified: 
    clang/include/clang/Driver/Options.td
    clang/test/Driver/clang_f_opts.c

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 71b257094a98..385ddbf5e40d 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -3258,6 +3258,7 @@ defm inline_small_functions : BooleanFFlag<"inline-small-functions">,
 defm ipa_cp : BooleanFFlag<"ipa-cp">,
     Group<clang_ignored_gcc_optimization_f_Group>;
 defm ivopts : BooleanFFlag<"ivopts">, Group<clang_ignored_gcc_optimization_f_Group>;
+def : Flag<["-"], "fno-semantic-interposition">, Group<clang_ignored_f_Group>;
 defm non_call_exceptions : BooleanFFlag<"non-call-exceptions">, Group<clang_ignored_f_Group>;
 defm peel_loops : BooleanFFlag<"peel-loops">, Group<clang_ignored_gcc_optimization_f_Group>;
 defm permissive : BooleanFFlag<"permissive">, Group<clang_ignored_f_Group>;

diff  --git a/clang/test/Driver/clang_f_opts.c b/clang/test/Driver/clang_f_opts.c
index 970b4e934e78..7038a2b52f66 100644
--- a/clang/test/Driver/clang_f_opts.c
+++ b/clang/test/Driver/clang_f_opts.c
@@ -251,6 +251,7 @@
 // RUN:     -fexec-charset=UTF-8                                             \
 // RUN:     -fivopts -fno-ivopts                                              \
 // RUN:     -fnon-call-exceptions -fno-non-call-exceptions                    \
+// RUN:     -fno-semantic-interposition                                       \
 // RUN:     -fpermissive -fno-permissive                                      \
 // RUN:     -fdefer-pop -fno-defer-pop                                        \
 // RUN:     -fprefetch-loop-arrays -fno-prefetch-loop-arrays                  \