Modules: add command line option fmodules-disable-diagnostic-validation

With PCH+Module, sometimes compiler gives a hard error:
Module file ‘<some-file path>.pcm' is out of date and needs to be rebuilt

This happens when we have a pch importing a module and the module gets
overwritten by another compiler instance after we build the pch (one example is
that both compiler instances hash to the same pcm file but use different
diagnostic options). When we try to load the pch later on, the compiler notices
that the imported module is out of date (modification date, size do not match)
but it can't handle this out of date pcm (i.e it does not know how to rebuild
the pch).

This commit introduces a new command line option so for PCH + module, we can
turn on this option and if two compiler instances only differ in diagnostic
options, the latter instance will not invalidate the original pcm.

rdar://26675801
Differential Revision: http://reviews.llvm.org/D22773

llvm-svn: 276769

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index 5267a3b..babaa2d 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -608,11 +608,15 @@ void DumpModuleInfoAction::ExecuteAction() {
   llvm::raw_ostream &Out = OutFile.get()? *OutFile.get() : llvm::outs();
 
   Out << "Information for module file '" << getCurrentFile() << "':\n";
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
   DumpModuleInfoListener Listener(Out);
+  HeaderSearchOptions &HSOpts =
+      PP.getHeaderSearchInfo().getHeaderSearchOpts();
   ASTReader::readASTFileControlBlock(
       getCurrentFile(), getCompilerInstance().getFileManager(),
       getCompilerInstance().getPCHContainerReader(),
-      /*FindModuleFileExtensions=*/true, Listener);
+      /*FindModuleFileExtensions=*/true, Listener,
+      HSOpts.ModulesValidateDiagnosticOptions);
 }
 
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