XCode: Use -j build option when job capacity is specified by user

Fixes: #18304

Source/cmGlobalXCodeGenerator.cxx

@@ -503,16 +503,15 @@ cmGlobalXCodeGenerator::GenerateBuildCommand(
     }
   }
 
-  if (this->XcodeBuildSystem >= BuildSystem::Twelve) {
+  if ((this->XcodeBuildSystem >= BuildSystem::Twelve) ||
+      (jobs != cmake::NO_BUILD_PARALLEL_LEVEL)) {
     makeCommand.Add("-parallelizeTargets");
   }
   makeCommand.Add("-configuration", (config.empty() ? "Debug" : config));
 
-  if (jobs != cmake::NO_BUILD_PARALLEL_LEVEL) {
-    makeCommand.Add("-jobs");
-    if (jobs != cmake::DEFAULT_BUILD_PARALLEL_LEVEL) {
-      makeCommand.Add(std::to_string(jobs));
-    }
+  if ((jobs != cmake::NO_BUILD_PARALLEL_LEVEL) &&
+      (jobs != cmake::DEFAULT_BUILD_PARALLEL_LEVEL)) {
+    makeCommand.Add("-jobs", std::to_string(jobs));
   }
 
   if (this->XcodeVersion >= 70) {

Tests/RunCMake/CommandLine/RunCMakeTest.cmake

@@ -201,8 +201,8 @@ function(run_BuildDir)
   run_cmake_command(BuildDir--build--parallel-large ${CMAKE_COMMAND} -E chdir ..
     ${CMAKE_COMMAND} --build BuildDir-build --parallel 4294967293)
 
-  # No default jobs for Xcode and FreeBSD build command
-  if(NOT RunCMake_GENERATOR MATCHES "Xcode" AND NOT CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
+  # No default jobs for FreeBSD build command
+  if(NOT CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
     run_cmake_command(BuildDir--build-jobs-no-number ${CMAKE_COMMAND} -E chdir ..
       ${CMAKE_COMMAND} --build BuildDir-build -j)
     run_cmake_command(BuildDir--build-jobs-no-number-trailing--target ${CMAKE_COMMAND} -E chdir ..