Xcode: Fix custom command work-dir placeholders in "new build system"

The placeholders for `CONFIGURATION` and `EFFECTIVE_PLATFORM_NAME` need
to be handled in the `WORKING_DIRECTORY` of custom commands just as we
already do for the `COMMAND`.

Fixes: #21483

Source/cmGlobalXCodeGenerator.cxx

@@ -1965,6 +1965,15 @@ cmXCodeObject* cmGlobalXCodeGenerator::CreateRunScriptBuildPhase(
   return buildPhase;
 }
 
+namespace {
+void ReplaceScriptVars(std::string& cmd)
+{
+  cmSystemTools::ReplaceString(cmd, "$(CONFIGURATION)", "$CONFIGURATION");
+  cmSystemTools::ReplaceString(cmd, "$(EFFECTIVE_PLATFORM_NAME)",
+                               "$EFFECTIVE_PLATFORM_NAME");
+}
+}
+
 std::string cmGlobalXCodeGenerator::ConstructScript(
   cmCustomCommandGenerator const& ccg)
 {
@@ -1975,6 +1984,7 @@ std::string cmGlobalXCodeGenerator::ConstructScript(
     wd = lg->GetCurrentBinaryDirectory();
   }
   wd = lg->ConvertToOutputFormat(wd, cmOutputConverter::SHELL);
+  ReplaceScriptVars(wd);
   script = cmStrCat(script, "  cd ", wd, "\n");
   for (unsigned int c = 0; c < ccg.GetNumberOfCommands(); ++c) {
     std::string cmd = ccg.GetCommand(c);
@@ -1984,9 +1994,7 @@ std::string cmGlobalXCodeGenerator::ConstructScript(
     cmSystemTools::ReplaceString(cmd, "/./", "/");
     cmd = lg->ConvertToOutputFormat(cmd, cmOutputConverter::SHELL);
     ccg.AppendArguments(c, cmd);
-    cmSystemTools::ReplaceString(cmd, "$(CONFIGURATION)", "$CONFIGURATION");
-    cmSystemTools::ReplaceString(cmd, "$(EFFECTIVE_PLATFORM_NAME)",
-                                 "$EFFECTIVE_PLATFORM_NAME");
+    ReplaceScriptVars(cmd);
     script = cmStrCat(script, "  ", cmd, '\n');
   }
   return script;

Tests/RunCMake/add_custom_command/PrintDir.cmake

@@ -0,0 +1 @@
+message(STATUS "WorkingDir='${CMAKE_CURRENT_BINARY_DIR}'")

Tests/RunCMake/add_custom_command/RunCMakeTest.cmake

@@ -27,3 +27,18 @@ set(RunCMake_TEST_NO_CLEAN 1)
 run_cmake_command(AssigningMultipleTargets-build ${CMAKE_COMMAND} --build .)
 unset(RunCMake_TEST_BINARY_DIR)
 unset(RunCMake_TEST_NO_CLEAN)
+
+if(NOT RunCMake_GENERATOR STREQUAL "Ninja Multi-Config")
+  run_cmake(WorkingDirectory)
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/WorkingDirectory-build)
+  set(RunCMake_TEST_NO_CLEAN 1)
+  if(RunCMake_GENERATOR_IS_MULTI_CONFIG)
+    set(RunCMake-stdout-file WorkingDirectory-build-multi-config-stdout.txt)
+  else()
+    set(RunCMake-stdout-file WorkingDirectory-build-single-config-stdout.txt)
+  endif()
+  run_cmake_command(WorkingDirectory-build ${CMAKE_COMMAND} --build . --config Debug)
+  unset(RunCMake-stdout-file)
+  unset(RunCMake_TEST_BINARY_DIR)
+  unset(RunCMake_TEST_NO_CLEAN)
+endif()

Tests/RunCMake/add_custom_command/WorkingDirectory-build-multi-config-stdout.txt

@@ -0,0 +1 @@
+-- WorkingDir='[^']*/Tests/RunCMake/add_custom_command/WorkingDirectory-build/Debug'

Tests/RunCMake/add_custom_command/WorkingDirectory-build-single-config-stdout.txt

@@ -0,0 +1 @@
+-- WorkingDir='[^']*/Tests/RunCMake/add_custom_command/WorkingDirectory-build'

Tests/RunCMake/add_custom_command/WorkingDirectory.cmake

@@ -0,0 +1,9 @@
+add_custom_target(mkdir COMMAND ${CMAKE_COMMAND} -E make_directory "${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>")
+add_custom_command(
+  OUTPUT out.txt
+  COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_SOURCE_DIR}/PrintDir.cmake
+  WORKING_DIRECTORY ${CMAKE_CFG_INTDIR}
+  )
+set_property(SOURCE out.txt PROPERTY SYMBOLIC 1)
+add_custom_target(drive ALL DEPENDS out.txt)
+add_dependencies(drive mkdir)