Refactoring: Makefiles Generators: Add support for various depends scanners

Source/cmLocalGenerator.h

@@ -43,6 +43,13 @@ enum class cmSourceOutputKind
   OutputOrByproduct
 };
 
+/** What scanner to use for dependencies lookup.  */
+enum class cmDependencyScannerKind
+{
+  CMake,
+  Compiler
+};
+
 /** Target and source file which have a specific output.  */
 struct cmSourcesWithOutput
 {

Source/cmLocalUnixMakefileGenerator3.cxx

@@ -2049,16 +2049,18 @@ std::string cmLocalUnixMakefileGenerator3::GetTargetDirectory(
 }
 
 cmLocalUnixMakefileGenerator3::ImplicitDependLanguageMap const&
-cmLocalUnixMakefileGenerator3::GetImplicitDepends(const cmGeneratorTarget* tgt)
+cmLocalUnixMakefileGenerator3::GetImplicitDepends(
+  const cmGeneratorTarget* tgt, cmDependencyScannerKind scanner)
 {
-  return this->ImplicitDepends[tgt->GetName()];
+  return this->ImplicitDepends[tgt->GetName()][scanner];
 }
 
 void cmLocalUnixMakefileGenerator3::AddImplicitDepends(
   const cmGeneratorTarget* tgt, const std::string& lang,
-  const std::string& obj, const std::string& src)
+  const std::string& obj, const std::string& src,
+  cmDependencyScannerKind scanner)
 {
-  this->ImplicitDepends[tgt->GetName()][lang][obj].push_back(src);
+  this->ImplicitDepends[tgt->GetName()][scanner][lang][obj].push_back(src);
 }
 
 void cmLocalUnixMakefileGenerator3::CreateCDCommand(

Source/cmLocalUnixMakefileGenerator3.h

@@ -13,6 +13,7 @@
 
 #include "cmDepends.h"
 #include "cmLocalCommonGenerator.h"
+#include "cmLocalGenerator.h"
 
 class cmCustomCommand;
 class cmCustomCommandGenerator;
@@ -152,23 +153,21 @@ public:
 
   // File pairs for implicit dependency scanning.  The key of the map
   // is the depender and the value is the explicit dependee.
-  struct ImplicitDependFileMap : public cmDepends::DependencyMap
-  {
-  };
-  struct ImplicitDependLanguageMap
-    : public std::map<std::string, ImplicitDependFileMap>
-  {
-  };
-  struct ImplicitDependTargetMap
-    : public std::map<std::string, ImplicitDependLanguageMap>
-  {
-  };
+  using ImplicitDependFileMap = cmDepends::DependencyMap;
+  using ImplicitDependLanguageMap =
+    std::map<std::string, ImplicitDependFileMap>;
+  using ImplicitDependScannerMap =
+    std::map<cmDependencyScannerKind, ImplicitDependLanguageMap>;
+  using ImplicitDependTargetMap =
+    std::map<std::string, ImplicitDependScannerMap>;
   ImplicitDependLanguageMap const& GetImplicitDepends(
-    cmGeneratorTarget const* tgt);
+    cmGeneratorTarget const* tgt,
+    cmDependencyScannerKind scanner = cmDependencyScannerKind::CMake);
 
-  void AddImplicitDepends(cmGeneratorTarget const* tgt,
-                          const std::string& lang, const std::string& obj,
-                          const std::string& src);
+  void AddImplicitDepends(
+    cmGeneratorTarget const* tgt, const std::string& lang,
+    const std::string& obj, const std::string& src,
+    cmDependencyScannerKind scanner = cmDependencyScannerKind::CMake);
 
   // write the target rules for the local Makefile into the stream
   void WriteLocalAllRules(std::ostream& ruleFileStream);

Source/cmMakefileTargetGenerator.cxx

@@ -23,6 +23,7 @@
 #include "cmGlobalUnixMakefileGenerator3.h"
 #include "cmLinkLineComputer.h" // IWYU pragma: keep
 #include "cmLocalCommonGenerator.h"
+#include "cmLocalGenerator.h"
 #include "cmLocalUnixMakefileGenerator3.h"
 #include "cmMakefile.h"
 #include "cmMakefileExecutableTargetGenerator.h"