This is not considered a preprocessor directive in .S files:
# 4
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67233 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index 5a4d2ee..8e76b92 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -499,6 +499,8 @@
goto TryAgain;
case tok::numeric_constant: // # 7 GNU line marker directive.
+ if (getLangOptions().AsmPreprocessor)
+ break; // # 4 is not a preprocessor directive in .S files.
return HandleDigitDirective(Result);
default:
IdentifierInfo *II = Result.getIdentifierInfo();