[Modules] Resolve top-headers of modules lazily.

This allows resolving top-header filenames of modules to FileEntries when
we need them, not eagerly.

Note that that this breaks ABI for libclang functions
clang_Module_getTopLevelHeader / clang_Module_getNumTopLevelHeaders
but this is fine because they are experimental and not widely used yet.

llvm-svn: 176975

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Lex/ModuleMap.cpp b/clang/lib/Lex/ModuleMap.cpp
index 81cb94d..f9b4e2c 100644
--- a/clang/lib/Lex/ModuleMap.cpp
+++ b/clang/lib/Lex/ModuleMap.cpp
@@ -202,7 +202,7 @@ Module *ModuleMap::findModuleForHeader(const FileEntry *File) {
                            llvm::sys::path::stem(File->getName()), NameBuf);
         Result = findOrCreateModule(Name, Result, /*IsFramework=*/false,
                                     Explicit).first;
-        Result->TopHeaders.insert(File);
+        Result->addTopHeader(File);
         
         // If inferred submodules export everything they import, add a 
         // wildcard to the set of exports.