cmGeneratorTarget: Convert GetAppleArchs output argument to return value

Source/cmFileAPICodemodel.cxx

@@ -1355,8 +1355,8 @@ CompileData Target::BuildCompileData(cmSourceFile* sf)
   }
 
   // Add precompile headers compile options.
-  std::vector<std::string> architectures;
-  this->GT->GetAppleArchs(this->Config, architectures);
+  std::vector<std::string> architectures =
+    this->GT->GetAppleArchs(this->Config);
   if (architectures.empty()) {
     architectures.emplace_back();
   }

Source/cmGeneratorTarget.cxx

@@ -3448,11 +3448,12 @@ std::string cmGeneratorTarget::GetCompilePDBDirectory(
   return "";
 }
 
-void cmGeneratorTarget::GetAppleArchs(const std::string& config,
-                                      std::vector<std::string>& archVec) const
+std::vector<std::string> cmGeneratorTarget::GetAppleArchs(
+  std::string const& config) const
 {
+  std::vector<std::string> archVec;
   if (!this->IsApple()) {
-    return;
+    return archVec;
   }
   cmValue archs = nullptr;
   if (!config.empty()) {
@@ -3469,6 +3470,7 @@ void cmGeneratorTarget::GetAppleArchs(const std::string& config,
   if (archVec.empty()) {
     this->Makefile->GetDefExpandList("_CMAKE_APPLE_ARCHS_DEFAULT", archVec);
   }
+  return archVec;
 }
 
 void cmGeneratorTarget::AddExplicitLanguageFlags(std::string& flags,

Source/cmGeneratorTarget.h

@@ -484,8 +484,7 @@ public:
       holding object files for the given configuration.  */
   std::string GetObjectDirectory(std::string const& config) const;
 
-  void GetAppleArchs(const std::string& config,
-                     std::vector<std::string>& archVec) const;
+  std::vector<std::string> GetAppleArchs(std::string const& config) const;
 
   void AddExplicitLanguageFlags(std::string& flags,
                                 cmSourceFile const& sf) const;

Source/cmGlobalXCodeGenerator.cxx

@@ -2513,8 +2513,7 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmGeneratorTarget* gtgt,
   }
 
   // Set target-specific architectures.
-  std::vector<std::string> archs;
-  gtgt->GetAppleArchs(configName, archs);
+  std::vector<std::string> archs = gtgt->GetAppleArchs(configName);
 
   if (!archs.empty()) {
     // Enable ARCHS attribute.

Source/cmLocalGenerator.cxx

@@ -1873,8 +1873,7 @@ void cmLocalGenerator::AddArchitectureFlags(std::string& flags,
 {
   // Only add Apple specific flags on Apple platforms
   if (target->IsApple() && this->EmitUniversalBinaryFlags) {
-    std::vector<std::string> archs;
-    target->GetAppleArchs(config, archs);
+    std::vector<std::string> archs = target->GetAppleArchs(config);
     if (!archs.empty() &&
         (lang == "C" || lang == "CXX" || lang == "OBJC" || lang == "OBJCXX" ||
          lang == "ASM")) {
@@ -2594,7 +2593,7 @@ void cmLocalGenerator::AddPchDependencies(cmGeneratorTarget* target)
 
       std::vector<std::string> architectures;
       if (!this->GetGlobalGenerator()->IsXcode()) {
-        target->GetAppleArchs(config, architectures);
+        architectures = target->GetAppleArchs(config);
       }
       if (architectures.empty()) {
         architectures.emplace_back();

Source/cmMakefileTargetGenerator.cxx

@@ -541,8 +541,8 @@ void cmMakefileTargetGenerator::WriteTargetLanguageFlags()
     *this->FlagFileStream << language << "_DEFINES = " << defines << "\n\n";
     *this->FlagFileStream << language << "_INCLUDES = " << includes << "\n\n";
 
-    std::vector<std::string> architectures;
-    this->GeneratorTarget->GetAppleArchs(this->GetConfigName(), architectures);
+    std::vector<std::string> architectures =
+      this->GeneratorTarget->GetAppleArchs(this->GetConfigName());
     architectures.emplace_back();
 
     for (const std::string& arch : architectures) {
@@ -671,8 +671,8 @@ void cmMakefileTargetGenerator::WriteObjectRuleFiles(
   std::string configUpper = cmSystemTools::UpperCase(config);
 
   // Add precompile headers dependencies
-  std::vector<std::string> architectures;
-  this->GeneratorTarget->GetAppleArchs(config, architectures);
+  std::vector<std::string> architectures =
+    this->GeneratorTarget->GetAppleArchs(config);
   if (architectures.empty()) {
     architectures.emplace_back();
   }

Source/cmNinjaTargetGenerator.cxx

@@ -169,9 +169,9 @@ std::string cmNinjaTargetGenerator::ComputeFlagsForObject(
   cmSourceFile const* source, const std::string& language,
   const std::string& config)
 {
-  std::vector<std::string> architectures;
   std::unordered_map<std::string, std::string> pchSources;
-  this->GeneratorTarget->GetAppleArchs(config, architectures);
+  std::vector<std::string> architectures =
+    this->GeneratorTarget->GetAppleArchs(config);
   if (architectures.empty()) {
     architectures.emplace_back();
   }
@@ -1390,8 +1390,8 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatement(
   // Add precompile headers dependencies
   std::vector<std::string> depList;
 
-  std::vector<std::string> architectures;
-  this->GeneratorTarget->GetAppleArchs(config, architectures);
+  std::vector<std::string> architectures =
+    this->GeneratorTarget->GetAppleArchs(config);
   if (architectures.empty()) {
     architectures.emplace_back();
   }