Implement support for the -undef command line option, patch by
Roman Divacky! PR5363
llvm-svn: 85932
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 2719fbb..ec5c106 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -443,7 +443,8 @@
/// environment ready to process a single file. This returns true on error.
///
bool clang::InitializePreprocessor(Preprocessor &PP,
- const PreprocessorInitOptions &InitOpts) {
+ const PreprocessorInitOptions &InitOpts,
+ bool undef_macros) {
std::vector<char> PredefineBuffer;
const char *LineDirective = "# 1 \"<built-in>\" 3\n";
@@ -451,8 +452,9 @@
LineDirective, LineDirective+strlen(LineDirective));
// Install things like __POWERPC__, __GNUC__, etc into the macro table.
- InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(),
- PredefineBuffer);
+ if (!undef_macros)
+ InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(),
+ PredefineBuffer);
// Add on the predefines from the driver. Wrap in a #line directive to report
// that they come from the command line.