Features: Refactor <LANG>_STANDARD update

In order to support generator expressions in target COMPILE_FEATURES
we apply them at generate time.  Move this step to the beginning of
generation instead of doing it on demand while collecting flags.
This avoids repeating the process unnecessarily, and will then allow
`cmLocalGenerator::AddCompilerRequirementFlag` to be used any time
during generation.

1 files changed, 13 insertions, 0 deletions

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index a0f677b..3f50e32 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -2919,6 +2919,19 @@ void cmGeneratorTarget::ComputeTargetManifest(const std::string& config) const
   }
 }
 
+bool cmGeneratorTarget::ComputeCompileFeatures(std::string const& config) const
+{
+  std::vector<std::string> features;
+  this->GetCompileFeatures(features, config);
+  for (std::vector<std::string>::const_iterator it = features.begin();
+       it != features.end(); ++it) {
+    if (!this->Makefile->AddRequiredTargetFeature(this->Target, *it)) {
+      return false;
+    }
+  }
+  return true;
+}
+
 std::string cmGeneratorTarget::GetImportedLibName(
   std::string const& config) const
 {