Xcode: Use correct Object Library paths for cross-SDK builds

When calculating Object Library paths take a look at the
`XCODE_EMIT_EFFECTIVE_PLATFORM_NAME` property to enable builds with
different SDKs. Otherwise a hard-coded architecture could be chosen.

Fixes: #16040

2 files changed, 5 insertions, 5 deletions

diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
index 45c1764..9037961 100644
--- a/Source/cmGlobalXCodeGenerator.cxx
+++ b/Source/cmGlobalXCodeGenerator.cxx
@@ -147,7 +147,7 @@ cmGlobalXCodeGenerator::cmGlobalXCodeGenerator(
   this->XcodeBuildCommandInitialized = false;
 
   this->ObjectDirArchDefault = "$(CURRENT_ARCH)";
-  this->ComputeObjectDirArch();
+  this->ObjectDirArch = this->ObjectDirArchDefault;
 
   cm->GetState()->SetIsGeneratorMultiConfig(true);
 }
@@ -3087,12 +3087,12 @@ void cmGlobalXCodeGenerator::ComputeArchitectures(cmMakefile* mf)
     }
   }
 
-  this->ComputeObjectDirArch();
+  this->ComputeObjectDirArch(mf);
 }
 
-void cmGlobalXCodeGenerator::ComputeObjectDirArch()
+void cmGlobalXCodeGenerator::ComputeObjectDirArch(cmMakefile* mf)
 {
-  if (this->Architectures.size() > 1) {
+  if (this->Architectures.size() > 1 || this->UseEffectivePlatformName(mf)) {
     this->ObjectDirArch = "$(CURRENT_ARCH)";
   } else if (!this->Architectures.empty()) {
     this->ObjectDirArch = this->Architectures[0];
diff --git a/Source/cmGlobalXCodeGenerator.h b/Source/cmGlobalXCodeGenerator.h
index f38fa3c..e69793b 100644
--- a/Source/cmGlobalXCodeGenerator.h
+++ b/Source/cmGlobalXCodeGenerator.h
@@ -247,7 +247,7 @@ private:
                                         const cmGeneratorTarget* t) const;
 
   void ComputeArchitectures(cmMakefile* mf);
-  void ComputeObjectDirArch();
+  void ComputeObjectDirArch(cmMakefile* mf);
 
   void addObject(cmXCodeObject* obj);
   std::string PostBuildMakeTarget(std::string const& tName,