Merge topic 'ninja-fix-subdir-objlib-languages'

07fc7b75 Tests: Test using objects from a language enabled in a subdirectory (#15325)
fdbfcfdf Ninja: Generate rules only for languages compiled in a target (#15325)

Source/cmNinjaNormalTargetGenerator.cxx

@@ -110,13 +110,26 @@ void cmNinjaNormalTargetGenerator::WriteLanguagesRules()
     << "\n\n";
 #endif
 
+  // Write rules for languages compiled in this target.
   std::set<std::string> languages;
-  this->GetTarget()->GetLanguages(languages,
-                  this->GetMakefile()->GetSafeDefinition("CMAKE_BUILD_TYPE"));
+  std::vector<cmSourceFile*> sourceFiles;
+  this->GetTarget()->GetSourceFiles(sourceFiles,
+    this->GetMakefile()->GetSafeDefinition("CMAKE_BUILD_TYPE"));
+  for(std::vector<cmSourceFile*>::const_iterator
+        i = sourceFiles.begin(); i != sourceFiles.end(); ++i)
+    {
+    const std::string& lang = (*i)->GetLanguage();
+    if(!lang.empty())
+      {
+      languages.insert(lang);
+      }
+    }
   for(std::set<std::string>::const_iterator l = languages.begin();
       l != languages.end();
       ++l)
+    {
     this->WriteLanguageRules(*l);
+    }
 }
 
 const char *cmNinjaNormalTargetGenerator::GetVisibleTypeName() const

Tests/CMakeLists.txt

@@ -251,6 +251,7 @@ if(BUILD_TESTING)
   endif()
   ADD_TEST_MACRO(COnly COnly)
   ADD_TEST_MACRO(CxxOnly CxxOnly)
+  ADD_TEST_MACRO(CxxSubdirC CxxSubdirC)
   ADD_TEST_MACRO(IPO COnly/COnly)
   ADD_TEST_MACRO(OutDir runtime/OutDir)
   ADD_TEST_MACRO(ObjectLibrary UseCshared)

Tests/CxxSubdirC/CMakeLists.txt

@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.0)
+project(CxxSubdirC CXX)
+add_subdirectory(Cdir)
+add_executable(CxxSubdirC main.cxx $<TARGET_OBJECTS:Cobj>)

Tests/CxxSubdirC/Cdir/CMakeLists.txt

@@ -0,0 +1,2 @@
+enable_language(C)
+add_library(Cobj OBJECT Cobj.c)

Tests/CxxSubdirC/Cdir/Cobj.c

@@ -0,0 +1 @@
+int Cobj(void) { return 0; }

Tests/CxxSubdirC/main.cxx

@@ -0,0 +1,2 @@
+extern "C" int Cobj(void);
+int main() { return Cobj(); }