cmTarget: Add HasKnownObjectFileLocation() shorthand

Allow `cmGlobalGenerator`s to decide `HasKnownObjectFileLocation()` per given
`cmTarget`

- `cmGlobalGenerator::HasKnownObjectFileLocation()` now takes an optional `cmGeneratorTarget`
- `cmTarget::HasKnownObjectFileLocation()` added as a shorthand

Source/cmExportBuildFileGenerator.cxx

@@ -195,7 +195,7 @@ cmStateEnums::TargetType cmExportBuildFileGenerator::GetExportTargetType(
   // to support transitive usage requirements on other targets that
   // use the object library.
   if (targetType == cmStateEnums::OBJECT_LIBRARY &&
-      !this->LG->GetGlobalGenerator()->HasKnownObjectFileLocation(nullptr)) {
+      !target->Target->HasKnownObjectFileLocation(nullptr)) {
     targetType = cmStateEnums::INTERFACE_LIBRARY;
   }
   return targetType;

Source/cmFileAPICodemodel.cxx

@@ -1728,7 +1728,7 @@ Json::Value Target::DumpArtifacts()
 
   // Object libraries have only object files as artifacts.
   if (this->GT->GetType() == cmStateEnums::OBJECT_LIBRARY) {
-    if (!this->GT->GetGlobalGenerator()->HasKnownObjectFileLocation(nullptr)) {
+    if (!this->GT->Target->HasKnownObjectFileLocation(nullptr)) {
       return artifacts;
     }
     std::vector<cmSourceFile const*> objectSources;

Source/cmGeneratorExpressionNode.cxx

@@ -1785,7 +1785,7 @@ static const struct TargetObjectsNode : public cmGeneratorExpressionNode
     {
       std::string reason;
       if (!context->EvaluateForBuildsystem &&
-          !gg->HasKnownObjectFileLocation(&reason)) {
+          !gt->Target->HasKnownObjectFileLocation(&reason)) {
         std::ostringstream e;
         e << "The evaluation of the TARGET_OBJECTS generator expression "
              "is only suitable for consumption by CMake (limited"

Source/cmGlobalGenerator.h

@@ -459,10 +459,13 @@ public:
 
   virtual bool IsNinja() const { return false; }
 
-  /** Return true if we know the exact location of object files.
-      If false, store the reason in the given string.
-      This is meaningful only after EnableLanguage has been called.  */
-  virtual bool HasKnownObjectFileLocation(std::string*) const { return true; }
+  /** Return true if we know the exact location of object files for the given
+     cmTarget. If false, store the reason in the given string. This is
+     meaningful only after EnableLanguage has been called.  */
+  virtual bool HasKnownObjectFileLocation(cmTarget const&, std::string*) const
+  {
+    return true;
+  }
 
   virtual bool UseFolderProperty() const;
 

Source/cmGlobalXCodeGenerator.cxx

@@ -4924,7 +4924,7 @@ bool cmGlobalXCodeGenerator::IsMultiConfig() const
 }
 
 bool cmGlobalXCodeGenerator::HasKnownObjectFileLocation(
-  std::string* reason) const
+  cmTarget const&, std::string* reason) const
 {
   if (this->ObjectDirArch.find('$') != std::string::npos) {
     if (reason != nullptr) {

Source/cmGlobalXCodeGenerator.h

@@ -107,7 +107,8 @@ public:
 
   bool IsXcode() const override { return true; }
 
-  bool HasKnownObjectFileLocation(std::string* reason) const override;
+  bool HasKnownObjectFileLocation(cmTarget const&,
+                                  std::string* reason) const override;
 
   bool IsIPOSupported() const override { return true; }
 

Source/cmInstallCommand.cxx

@@ -919,8 +919,7 @@ bool HandleTargetsMode(std::vector<std::string> const& args,
         if (!objectArgs.GetDestination().empty()) {
           // Verify that we know where the objects are to install them.
           std::string reason;
-          if (!helper.Makefile->GetGlobalGenerator()
-                 ->HasKnownObjectFileLocation(&reason)) {
+          if (!target.HasKnownObjectFileLocation(&reason)) {
             status.SetError(
               cmStrCat("TARGETS given OBJECT library \"", target.GetName(),
                        "\" whose objects may not be installed", reason, "."));

Source/cmTarget.cxx

@@ -691,6 +691,11 @@ bool cmTarget::IsAndroidGuiExecutable() const
           this->impl->IsAndroid && this->GetPropertyAsBool("ANDROID_GUI"));
 }
 
+bool cmTarget::HasKnownObjectFileLocation(std::string* reason) const
+{
+  return this->GetGlobalGenerator()->HasKnownObjectFileLocation(*this, reason);
+}
+
 std::vector<cmCustomCommand> const& cmTarget::GetPreBuildCommands() const
 {
   return this->impl->PreBuildCommands;

Source/cmTarget.h

@@ -220,6 +220,8 @@ public:
   //! Return whether this target is a GUI executable on Android.
   bool IsAndroidGuiExecutable() const;
 
+  bool HasKnownObjectFileLocation(std::string* reason = nullptr) const;
+
   //! Get a backtrace from the creation of the target.
   cmListFileBacktrace const& GetBacktrace() const;