ObjC: Add _COMPILE_LAUNCHER support

Fixes: #20178

Tests/RunCMake/CMakeLists.txt

@@ -530,6 +530,9 @@ if("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
   if(CMAKE_Fortran_COMPILER)
     list(APPEND CompilerLauncher_ARGS -DCMake_TEST_Fortran=1)
   endif()
+  if (APPLE AND CMAKE_C_COMPILER_ID MATCHES "Clang|GNU")
+    list(APPEND CompilerLauncher_ARGS -DCMake_TEST_OBJC=1)
+  endif()
   add_RunCMake_test(CompilerLauncher)
   add_RunCMake_test(ctest_labels_for_subprojects)
 endif()

Tests/RunCMake/CompilerLauncher/OBJC-Build-stdout.txt

@@ -0,0 +1 @@
+.*-E env USED_LAUNCHER=1.*

Tests/RunCMake/CompilerLauncher/OBJC-launch-Build-stdout.txt

@@ -0,0 +1 @@
+.*-E env USED_LAUNCHER=1.*

Tests/RunCMake/CompilerLauncher/OBJC-launch.cmake

@@ -0,0 +1,3 @@
+set(CTEST_USE_LAUNCHERS 1)
+include(CTestUseLaunchers)
+include(OBJC.cmake)

Tests/RunCMake/CompilerLauncher/OBJC.cmake

@@ -0,0 +1,4 @@
+enable_language(OBJC)
+set(CMAKE_OBJC_COMPILER_LAUNCHER "${CMAKE_COMMAND};-E;env;USED_LAUNCHER=1")
+set(CMAKE_VERBOSE_MAKEFILE TRUE)
+add_executable(main main.m)

Tests/RunCMake/CompilerLauncher/OBJCXX-Build-stdout.txt

@@ -0,0 +1 @@
+.*-E env USED_LAUNCHER=1.*

Tests/RunCMake/CompilerLauncher/OBJCXX-launch-Build-stdout.txt

@@ -0,0 +1 @@
+.*-E env USED_LAUNCHER=1.*

Tests/RunCMake/CompilerLauncher/OBJCXX-launch.cmake

@@ -0,0 +1,3 @@
+set(CTEST_USE_LAUNCHERS 1)
+include(CTestUseLaunchers)
+include(OBJCXX.cmake)

Tests/RunCMake/CompilerLauncher/OBJCXX.cmake

@@ -0,0 +1,4 @@
+enable_language(OBJCXX)
+set(CMAKE_OBJCXX_COMPILER_LAUNCHER "${CMAKE_COMMAND};-E;env;USED_LAUNCHER=1")
+set(CMAKE_VERBOSE_MAKEFILE TRUE)
+add_executable(main main.mm)

Tests/RunCMake/CompilerLauncher/RunCMakeTest.cmake

@@ -22,6 +22,9 @@ endif()
 if(CMake_TEST_Fortran)
   list(APPEND langs Fortran)
 endif()
+if(CMake_TEST_OBJC)
+  list(APPEND langs OBJC OBJCXX)
+endif()
 
 foreach(lang ${langs})
   run_compiler_launcher(${lang})

Tests/RunCMake/CompilerLauncher/main.m

@@ -0,0 +1,4 @@
+int main(void)
+{
+  return 0;
+}

Tests/RunCMake/CompilerLauncher/main.mm

@@ -0,0 +1,4 @@
+int main()
+{
+  return 0;
+}