[Driver] Don't forward -m[no-]unaligned-access options to GCC when assembling/linking
Differential Revision: https://reviews.llvm.org/D45092
llvm-svn: 329810
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index a50e5bd..f70e5a5 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -85,6 +85,13 @@
A->getOption().matches(options::OPT_W_Group))
continue;
+ // Don't forward -mno-unaligned-access since GCC doesn't understand
+ // it and because it doesn't affect the assembly or link steps.
+ if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
+ (A->getOption().matches(options::OPT_munaligned_access) ||
+ A->getOption().matches(options::OPT_mno_unaligned_access)))
+ continue;
+
A->render(Args, CmdArgs);
}
}