<rdar://problem/13426257> Introduce SDKSettings.plist as an input file dependency for PCH/modules.

When we're building a precompiled header or module against an SDK on
Darwin, there will be a file SDKSettings.plist in the sysroot. Since
stat()'ing every system header on which a module or PCH file depends
is performance suicide, we instead stat() just SDKSettings.plist. This
hack works well on Darwin; it's unclear how we want to handle this on
other platforms. If there is a canonical file, we should use it; if
not, we either have to take the performance hit of stat()'ing system
headers repeatedly or roll the dice by not checking anything.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177194 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/include/clang/Serialization/ASTWriter.h b/include/clang/Serialization/ASTWriter.h
index 1bbf74061f..3f76a9781f 100644
--- a/include/clang/Serialization/ASTWriter.h
+++ b/include/clang/Serialization/ASTWriter.h
@@ -48,6 +48,7 @@ class CXXCtorInitializer;
 class FileEntry;
 class FPOptions;
 class HeaderSearch;
+class HeaderSearchOptions;
 class IdentifierResolver;
 class MacroDefinition;
 class OpaqueValueExpr;
@@ -416,7 +417,9 @@ private:
   void WriteBlockInfoBlock();
   void WriteControlBlock(Preprocessor &PP, ASTContext &Context,
                          StringRef isysroot, const std::string &OutputFile);
-  void WriteInputFiles(SourceManager &SourceMgr, StringRef isysroot);
+  void WriteInputFiles(SourceManager &SourceMgr,
+                       HeaderSearchOptions &HSOpts,
+                       StringRef isysroot);
   void WriteSourceManagerBlock(SourceManager &SourceMgr,
                                const Preprocessor &PP,
                                StringRef isysroot);