[Driver] Reject -fptrauth-intrinsics on non-AArch64 targets

And add a driver test missing from the original patch #65996.

Author: MaskRay

clang/include/clang/Driver/Options.td

@@ -4105,12 +4105,8 @@ defm strict_return : BoolFOption<"strict-return",
             " of a non-void function as unreachable">,
   PosFlag<SetTrue>>;
 
-let Group = f_Group in {
-  let Visibility = [ClangOption,CC1Option] in {
-    def fptrauth_intrinsics : Flag<["-"], "fptrauth-intrinsics">,
-      HelpText<"Enable pointer authentication intrinsics">;
-  }
-  def fno_ptrauth_intrinsics : Flag<["-"], "fno-ptrauth-intrinsics">;
+let Flags = [TargetSpecific] in {
+defm ptrauth_intrinsics : OptInCC1FFlag<"ptrauth-intrinsics", "Enable pointer authentication intrinsics">;
 }
 
 def fenable_matrix : Flag<["-"], "fenable-matrix">, Group<f_Group>,

clang/lib/Driver/ToolChains/Clang.cpp

@@ -1776,6 +1776,9 @@ void Clang::AddAArch64TargetArgs(const ArgList &Args,
   }
 
   AddUnalignedAccessWarning(CmdArgs);
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fptrauth_intrinsics,
+                    options::OPT_fno_ptrauth_intrinsics);
 }
 
 void Clang::AddLoongArchTargetArgs(const ArgList &Args,
@@ -7258,10 +7261,6 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   // -fno-common is the default, set -fcommon only when that flag is set.
   Args.addOptInFlag(CmdArgs, options::OPT_fcommon, options::OPT_fno_common);
 
-  if (Args.hasFlag(options::OPT_fptrauth_intrinsics,
-                   options::OPT_fno_ptrauth_intrinsics, false))
-    CmdArgs.push_back("-fptrauth-intrinsics");
-
   // -fsigned-bitfields is default, and clang doesn't yet support
   // -funsigned-bitfields.
   if (!Args.hasFlag(options::OPT_fsigned_bitfields,

clang/test/Driver/aarch64-ptrauth.c

@@ -0,0 +1,5 @@
+// RUN: %clang -### -c --target=aarch64 -fno-ptrauth-intrinsics -fptrauth-intrinsics %s 2>&1 | FileCheck %s --check-prefix=INTRIN
+// INTRIN: "-cc1"{{.*}} "-fptrauth-intrinsics"
+
+// RUN: not %clang -### -c --target=x86_64 -fptrauth-intrinsics %s 2>&1 | FileCheck %s --check-prefix=ERR
+// ERR: error: unsupported option '-fptrauth-intrinsics' for target '{{.*}}'