Frontend: Add -cxx-system-include option which can be used to specify an

explicit list for the C++ system include directories at the -cc1 level, as an
alternative to the horrible AddDefaultCPlusPlusIncludePaths().

llvm-svn: 113505

1 files changed, 7 insertions, 2 deletions

diff --git a/clang/lib/Frontend/InitHeaderSearch.cpp b/clang/lib/Frontend/InitHeaderSearch.cpp
index 139e244a6c4..88f663cae43 100644
--- a/clang/lib/Frontend/InitHeaderSearch.cpp
+++ b/clang/lib/Frontend/InitHeaderSearch.cpp
@@ -772,8 +772,13 @@ AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple) {
 void InitHeaderSearch::AddDefaultSystemIncludePaths(const LangOptions &Lang,
                                                     const llvm::Triple &triple,
                                             const HeaderSearchOptions &HSOpts) {
-  if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes)
-    AddDefaultCPlusPlusIncludePaths(triple);
+  if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes) {
+    if (!HSOpts.CXXSystemIncludes.empty()) {
+      for (unsigned i = 0, e = HSOpts.CXXSystemIncludes.size(); i != e; ++i)
+        AddPath(HSOpts.CXXSystemIncludes[i], System, true, false, false);
+    } else
+      AddDefaultCPlusPlusIncludePaths(triple);
+  }
 
   AddDefaultCIncludePaths(triple, HSOpts);