fix PR6936: don't generate line marker directives when preprocessing

.S files.  "# 123" is passed through as-is, not treated as a line
marker in this mode.  No testcase, because it would be nasty and isn't
worth it.

llvm-svn: 102391

1 files changed, 9 insertions, 3 deletions

diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index ea0f8c08779..e035afd7077 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -501,7 +501,11 @@ void clang::InitializePreprocessor(Preprocessor &PP,
   InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(),
                           PP.getFileManager(), InitOpts);
 
-  Builder.append("# 1 \"<built-in>\" 3");
+  // Emit line markers for various builtin sections of the file.  We don't do
+  // this in asm preprocessor mode, because "# 4" is not a line marker directive
+  // in this mode.
+  if (!PP.getLangOptions().AsmPreprocessor)
+    Builder.append("# 1 \"<built-in>\" 3");
 
   // Install things like __POWERPC__, __GNUC__, etc into the macro table.
   if (InitOpts.UsePredefines)
@@ -510,7 +514,8 @@ void clang::InitializePreprocessor(Preprocessor &PP,
 
   // Add on the predefines from the driver.  Wrap in a #line directive to report
   // that they come from the command line.
-  Builder.append("# 1 \"<command line>\" 1");
+  if (!PP.getLangOptions().AsmPreprocessor)
+    Builder.append("# 1 \"<command line>\" 1");
 
   // Process #define's and #undef's in the order they are given.
   for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) {
@@ -536,7 +541,8 @@ void clang::InitializePreprocessor(Preprocessor &PP,
   }
 
   // Exit the command line and go back to <built-in> (2 is LC_LEAVE).
-  Builder.append("# 1 \"<built-in>\" 2");
+  if (!PP.getLangOptions().AsmPreprocessor)
+    Builder.append("# 1 \"<built-in>\" 2");
 
   // Copy PredefinedBuffer into the Preprocessor.
   PP.setPredefines(Predefines.str());