Ninja: Refactor Fortran rejection logic

Delay rejection of Fortran until after we've determined the version of
the `ninja` tool to be used.  This will later allow us to enable Fortran
support based on the version of ninja.

While at it, make the rejection an immediate fatal error.  Also provide
a stack trace so readers know what code tried to enable Fortran.

1 files changed, 13 insertions, 3 deletions

diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index b913621..8146ea5 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -561,12 +561,22 @@ void cmGlobalNinjaGenerator::FindMakeProgram(cmMakefile* mf)
   }
 }
 
+bool cmGlobalNinjaGenerator::CheckLanguages(
+  std::vector<std::string> const& languages, cmMakefile* mf) const
+{
+  if (std::find(languages.begin(), languages.end(), "Fortran") !=
+      languages.end()) {
+    mf->IssueMessage(cmake::FATAL_ERROR,
+                     "The Ninja generator does not support Fortran yet.");
+    cmSystemTools::SetFatalErrorOccured();
+    return false;
+  }
+  return true;
+}
+
 void cmGlobalNinjaGenerator::EnableLanguage(
   std::vector<std::string> const& langs, cmMakefile* mf, bool optional)
 {
-  if (std::find(langs.begin(), langs.end(), "Fortran") != langs.end()) {
-    cmSystemTools::Error("The Ninja generator does not support Fortran yet.");
-  }
   this->cmGlobalGenerator::EnableLanguage(langs, mf, optional);
   for (std::vector<std::string>::const_iterator l = langs.begin();
        l != langs.end(); ++l) {