diff options
Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
| -rw-r--r-- | clang/lib/Frontend/InitPreprocessor.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index d3989049432..45760ae15e4 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -70,6 +70,15 @@ static void AddImplicitInclude(MacroBuilder &Builder, StringRef File) { Builder.append(Twine("#include \"") + File + "\""); } +/// AddImplicitSystemIncludeIfExists - Add an implicit system \#include of the +/// specified file to the predefines buffer: precheck with __has_include. +static void AddImplicitSystemIncludeIfExists(MacroBuilder &Builder, + StringRef File) { + Builder.append(Twine("#if __has_include( <") + File + ">)"); + Builder.append(Twine("#include <") + File + ">"); + Builder.append(Twine("#endif")); +} + static void AddImplicitIncludeMacros(MacroBuilder &Builder, StringRef File) { Builder.append(Twine("#__include_macros \"") + File + "\""); // Marker token to stop the __include_macros fetch loop. @@ -1133,6 +1142,13 @@ void clang::InitializePreprocessor( if (!PP.getLangOpts().AsmPreprocessor) Builder.append("# 1 \"<built-in>\" 2"); + // Process -fsystem-include-if-exists directives. + for (unsigned i = 0, + e = InitOpts.FSystemIncludeIfExists.size(); i != e; ++i) { + const std::string &Path = InitOpts.FSystemIncludeIfExists[i]; + AddImplicitSystemIncludeIfExists(Builder, Path); + } + // If -imacros are specified, include them now. These are processed before // any -include directives. for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) |
