[Modules] Make r180934 more efficient by only loading top-level module maps in system header directories.
llvm-svn: 181643
diff --git a/clang/lib/Lex/HeaderSearch.cpp b/clang/lib/Lex/HeaderSearch.cpp
index b8556dd..8a99ed2 100644
--- a/clang/lib/Lex/HeaderSearch.cpp
+++ b/clang/lib/Lex/HeaderSearch.cpp
@@ -1146,6 +1146,20 @@
}
}
+void HeaderSearch::loadTopLevelSystemModules() {
+ // Load module maps for each of the header search directories.
+ for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
+ // We only care about normal system header directories.
+ if (!SearchDirs[Idx].isNormalDir() ||
+ SearchDirs[Idx].getDirCharacteristic() != SrcMgr::C_System) {
+ continue;
+ }
+
+ // Try to load a module map file for the search directory.
+ loadModuleMapFile(SearchDirs[Idx].getDir());
+ }
+}
+
void HeaderSearch::loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir) {
if (SearchDir.haveSearchedAllModuleMaps())
return;