Allow a new syntax in a module requires-declaration:

  requires ! feature

The purpose of this is to allow (for instance) the module map for /usr/include
to exclude <tgmath.h> and <complex.h> when building in C++ (these headers are
instead provided by the C++ standard library in this case, and the glibc C
<tgmath.h> header would otherwise try to include <complex.h>, resulting in a
module cycle).

llvm-svn: 193549

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index 81eb642b7e5..a3ab1be4a97 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -246,11 +246,11 @@ bool GenerateModuleAction::BeginSourceFileAction(CompilerInstance &CI,
   }
 
   // Check whether we can build this module at all.
-  StringRef Feature;
-  if (!Module->isAvailable(CI.getLangOpts(), CI.getTarget(), Feature)) {
+  clang::Module::Requirement Requirement;
+  if (!Module->isAvailable(CI.getLangOpts(), CI.getTarget(), Requirement)) {
     CI.getDiagnostics().Report(diag::err_module_unavailable)
       << Module->getFullModuleName()
-      << Feature;
+      << Requirement.second << Requirement.first;
 
     return false;
   }