diff --git a/include/clang/Lex/ModuleLoader.h b/include/clang/Lex/ModuleLoader.h
index ae79650d1fd0b7744ef8cf00aa383ecb6a50d904..70770d17e9ffa4abb0fc048315afc1dbe15b38cc 100644
--- a/include/clang/Lex/ModuleLoader.h
+++ b/include/clang/Lex/ModuleLoader.h
@@ -31,13 +31,22 @@ typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation> > ModuleIdPath;
/// \brief Describes the result of attempting to load a module.
class ModuleLoadResult {
- llvm::PointerIntPair<Module *, 1, bool> Storage;
-
public:
- ModuleLoadResult() : Storage() { }
+ enum LoadResultKind {
+ // We either succeeded or failed to load the named module.
+ Normal,
+ // The module exists, but does not actually contain the named submodule.
+ // This should only happen if the named submodule was inferred from an
+ // umbrella directory, but not actually part of the umbrella header.
+ MissingExpected,
+ // The module exists but cannot be imported due to a configuration mismatch.
+ ConfigMismatch
+ };
+ llvm::PointerIntPair<Module *, 2, LoadResultKind> Storage;
- ModuleLoadResult(Module *module, bool missingExpected)
- : Storage(module, missingExpected) { }
+ ModuleLoadResult() : Storage() { }
+ ModuleLoadResult(Module *M) : Storage(M, Normal) {}
+ ModuleLoadResult(LoadResultKind Kind) : Storage(nullptr, Kind) {}
operator Module *() const { return Storage.getPointer(); }
@@ -45,7 +54,11 @@ public:
/// actually a submodule that we expected to see (based on implying the
/// submodule from header structure), but didn't materialize in the actual
/// module.
- bool isMissingExpected() const { return Storage.getInt(); }
+ bool isMissingExpected() const { return Storage.getInt() == MissingExpected; }
+
+ /// \brief Determines whether the module failed to load due to a configuration
+ /// mismatch with an explicitly-named .pcm file from the command line.
+ bool isConfigMismatch() const { return Storage.getInt() == ConfigMismatch; }
};
/// \brief Abstract interface for a module loader.
diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index d314f6d18a6198529b160979137d53db9511a836..991e9ef990a0bce6a4206587382929cec0a13d6c 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -1393,8 +1393,21 @@ bool CompilerInstance::loadModuleFile(StringRef FileName) {
if (Module *M = CI.getPreprocessor()
.getHeaderSearchInfo()
.getModuleMap()
- .findModule(II->getName()))
+ .findModule(II->getName())) {
M->HasIncompatibleModuleFile = true;
+
+ // Mark module as available if the only reason it was unavailable
+ // was missing headers.
+ SmallVector<Module *, 2> Stack;
+ Stack.push_back(M);
+ while (!Stack.empty()) {
+ Module *Current = Stack.pop_back_val();
+ if (Current->IsMissingRequirement) continue;
+ Current->IsAvailable = true;
+ Stack.insert(Stack.end(),
+ Current->submodule_begin(), Current->submodule_end());
+ }
+ }
}
LoadedModules.clear();
}
@@ -1498,7 +1511,7 @@ CompilerInstance::loadModule(SourceLocation ImportLoc,
if (Module && Module->HasIncompatibleModuleFile) {
// We tried and failed to load a module file for this module. Fall
// back to textual inclusion for its headers.
- return ModuleLoadResult(nullptr, /*missingExpected*/true);
+ return ModuleLoadResult::ConfigMismatch;
}
getDiagnostics().Report(ModuleNameLoc, diag::err_module_build_disabled)
@@ -1705,7 +1718,7 @@ CompilerInstance::loadModule(SourceLocation ImportLoc,
<< Module->getFullModuleName()
<< SourceRange(Path.front().second, Path.back().second);
- return ModuleLoadResult(nullptr, true);
+ return ModuleLoadResult::MissingExpected;
}
// Check whether this module is available.
@@ -1739,7 +1752,7 @@ CompilerInstance::loadModule(SourceLocation ImportLoc,
}
LastModuleImportLoc = ImportLoc;
- LastModuleImportResult = ModuleLoadResult(Module, false);
+ LastModuleImportResult = ModuleLoadResult(Module);
return LastModuleImportResult;
}
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index 7fc008274bdb4f2ba671be6015e81e90bdcb93ec..85504de3d15d864eefe996f922f19ded13ef2741 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -1866,10 +1866,7 @@ void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc,
// unavailable, diagnose the situation and bail out.
// FIXME: Remove this; loadModule does the same check (but produces
// slightly worse diagnostics).
- if (!SuggestedModule.getModule()->isAvailable() &&
- !SuggestedModule.getModule()
- ->getTopLevelModule()
- ->HasIncompatibleModuleFile) {
+ if (!SuggestedModule.getModule()->isAvailable()) {
Module::Requirement Requirement;
Module::UnresolvedHeaderDirective MissingHeader;
Module *M = SuggestedModule.getModule();
@@ -1918,9 +1915,12 @@ void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc,
else if (Imported.isMissingExpected()) {
// We failed to find a submodule that we assumed would exist (because it
// was in the directory of an umbrella header, for instance), but no
- // actual module exists for it (because the umbrella header is
+ // actual module containing it exists (because the umbrella header is
// incomplete). Treat this as a textual inclusion.
SuggestedModule = ModuleMap::KnownHeader();
+ } else if (Imported.isConfigMismatch()) {
+ // On a configuration mismatch, enter the header textually. We still know
+ // that it's part of the corresponding module.
} else {
// We hit an error processing the import. Bail out.
if (hadModuleLoaderFatalFailure()) {
diff --git a/test/Modules/config-mismatch.cpp b/test/Modules/config-mismatch.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..548e78452df3bc00b8a46bd8edee40708cddb67b
--- /dev/null
+++ b/test/Modules/config-mismatch.cpp
@@ -0,0 +1,10 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: echo 'module M { header "foo.h" header "bar.h" }' > %t/map
+// RUN: echo 'template<typename T> void f(T t) { int n; t.f(n); }' > %t/foo.h
+// RUN: touch %t/bar.h
+// RUN: %clang_cc1 -fmodules -fmodules-local-submodule-visibility -x c++ %t/map -emit-module -fmodule-name=M -o %t/pcm
+// RUN: %clang_cc1 -fmodules -fmodules-local-submodule-visibility -fmodule-map-file=%t/map -fmodule-file=%t/pcm -I%t %s -fsyntax-only -fexceptions -Wno-module-file-config-mismatch
+// RUN: rm %t/bar.h
+// RUN: %clang_cc1 -fmodules -fmodules-local-submodule-visibility -fmodule-map-file=%t/map -fmodule-file=%t/pcm -I%t %s -fsyntax-only -fexceptions -Wno-module-file-config-mismatch
+#include "foo.h"