[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
llvm · Jan 14, 2020 · 5d1b3ba · 5d1b3ba
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diff --git 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
@@ -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                  \