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-rw-r--r--llvm/lib/Target/X86/X86MCAsmInfo.cpp5
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86MCAsmInfo.cpp b/llvm/lib/Target/X86/X86MCAsmInfo.cpp
index b220cff54c8..bc56e71b649 100644
--- a/llvm/lib/Target/X86/X86MCAsmInfo.cpp
+++ b/llvm/lib/Target/X86/X86MCAsmInfo.cpp
@@ -56,7 +56,10 @@ X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
Data64bitsDirective = 0; // we can't emit a 64-bit unit
// Use ## as a comment string so that .s files generated by llvm can go
- // through the GCC preprocessor without causing an error.
+ // through the GCC preprocessor without causing an error. This is needed
+ // because "clang foo.s" runs the C preprocessor, which is usually reserved
+ // for .S files on other systems. Perhaps this is because the file system
+ // wasn't always case preserving or something.
CommentString = "##";
PCSymbol = ".";
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