Refactor `.def` file lookup

Return a `cmSourceFile const*` from GetModuleDefinitionFile so that
callers can get more information than just the path to the file.

Source/cmCommonTargetGenerator.cxx

@@ -81,7 +81,7 @@ void cmCommonTargetGenerator::AddFeatureFlags(
 //----------------------------------------------------------------------------
 void cmCommonTargetGenerator::AddModuleDefinitionFlag(std::string& flags)
 {
-  if(this->ModuleDefinitionFile.empty())
+  if(!this->ModuleDefinitionFile)
     {
     return;
     }
@@ -98,7 +98,7 @@ void cmCommonTargetGenerator::AddModuleDefinitionFlag(std::string& flags)
   // vs6's "cl -link" pass it to the linker.
   std::string flag = defFileFlag;
   flag += (this->LocalGenerator->ConvertToLinkReference(
-             this->ModuleDefinitionFile));
+             this->ModuleDefinitionFile->GetFullPath()));
   this->LocalGenerator->AppendFlags(flags, flag);
 }
 

Source/cmCommonTargetGenerator.h

@@ -54,7 +54,7 @@ protected:
   std::string ConfigName;
 
   // The windows module definition source file (.def), if any.
-  std::string ModuleDefinitionFile;
+  cmSourceFile const* ModuleDefinitionFile;
 
   // Target-wide Fortran module output directory.
   bool FortranModuleDirectoryComputed;

Source/cmGeneratorTarget.cxx

@@ -2095,12 +2095,18 @@ cmGeneratorTarget::CompileInfo const* cmGeneratorTarget::GetCompileInfo(
 }
 
 //----------------------------------------------------------------------------
-std::string
+cmSourceFile const*
 cmGeneratorTarget::GetModuleDefinitionFile(const std::string& config) const
 {
-  std::string data;
+  std::vector<cmSourceFile const*> data;
-  IMPLEMENT_VISIT_IMPL(ModuleDefinitionFile, COMMA std::string)
+  IMPLEMENT_VISIT_IMPL(ModuleDefinitionFile,
-  return data;
+                       COMMA std::vector<cmSourceFile const*>)
+  if(!data.empty())
+    {
+    return data.front();
+    }
+
+  return 0;
 }
 
 bool cmGeneratorTarget::IsDLLPlatform() const

Source/cmGeneratorTarget.h

@@ -220,7 +220,7 @@ public:
   cmLocalGenerator* LocalGenerator;
   cmGlobalGenerator const* GlobalGenerator;
 
-  std::string GetModuleDefinitionFile(const std::string& config) const;
+  cmSourceFile const* GetModuleDefinitionFile(const std::string& config) const;
 
   /** Return whether or not the target is for a DLL platform.  */
   bool IsDLLPlatform() const;

Source/cmMakefileTargetGenerator.cxx

@@ -1497,9 +1497,9 @@ void cmMakefileTargetGenerator
   this->AppendTargetDepends(depends);
 
   // Add a dependency on the link definitions file, if any.
-  if(!this->ModuleDefinitionFile.empty())
+  if(this->ModuleDefinitionFile)
     {
-    depends.push_back(this->ModuleDefinitionFile);
+    depends.push_back(this->ModuleDefinitionFile->GetFullPath());
     }
 
   // Add a dependency on user-specified manifest files, if any.

Source/cmNinjaTargetGenerator.cxx

@@ -195,9 +195,10 @@ cmNinjaDeps cmNinjaTargetGenerator::ComputeLinkDeps() const
   std::transform(deps.begin(), deps.end(), result.begin(), MapToNinjaPath());
 
   // Add a dependency on the link definitions file, if any.
-  if(!this->ModuleDefinitionFile.empty())
+  if(this->ModuleDefinitionFile)
     {
-    result.push_back(this->ConvertToNinjaPath(this->ModuleDefinitionFile));
+    result.push_back(this->ConvertToNinjaPath(
+        this->ModuleDefinitionFile->GetFullPath()));
     }
 
   // Add a dependency on user-specified manifest files, if any.

Source/cmVisualStudio10TargetGenerator.cxx

@@ -2642,10 +2642,11 @@ cmVisualStudio10TargetGenerator::ComputeLinkOptions(std::string const& config)
 
   if(this->MSTools)
     {
-    std::string def = this->GeneratorTarget->GetModuleDefinitionFile("");
+    if (cmSourceFile const* defsrc =
-    if(!def.empty())
+        this->GeneratorTarget->GetModuleDefinitionFile(""))
       {
-      linkOptions.AddFlag("ModuleDefinitionFile", def.c_str());
+      linkOptions.AddFlag("ModuleDefinitionFile",
+                          defsrc->GetFullPath().c_str());
       }
     linkOptions.AppendFlag("IgnoreSpecificDefaultLibraries",
                            "%(IgnoreSpecificDefaultLibraries)");