[AArch64][PAC][clang][ELF] Support PAuth ABI core info (#85235)

Depends on #87545

Emit PAuth ABI compatibility tag values as llvm module flags:
- `aarch64-elf-pauthabi-platform`
- `aarch64-elf-pauthabi-version`

For platform 0x10000002 (llvm_linux), the version value bits correspond
to the following LangOptions defined in #85232:

- bit 0: `PointerAuthIntrinsics`;
- bit 1: `PointerAuthCalls`;
- bit 2: `PointerAuthReturns`;
- bit 3: `PointerAuthAuthTraps`;
- bit 4: `PointerAuthVTPtrAddressDiscrimination`;
- bit 5: `PointerAuthVTPtrTypeDiscrimination`;
- bit 6: `PointerAuthInitFini`.

---------

Co-authored-by: Ahmed Bougacha <ahmed@bougacha.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 948fe08..dbb5f56 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -3346,11 +3346,31 @@ static void GeneratePointerAuthArgs(const LangOptions &Opts,
                                     ArgumentConsumer Consumer) {
   if (Opts.PointerAuthIntrinsics)
     GenerateArg(Consumer, OPT_fptrauth_intrinsics);
+  if (Opts.PointerAuthCalls)
+    GenerateArg(Consumer, OPT_fptrauth_calls);
+  if (Opts.PointerAuthReturns)
+    GenerateArg(Consumer, OPT_fptrauth_returns);
+  if (Opts.PointerAuthAuthTraps)
+    GenerateArg(Consumer, OPT_fptrauth_auth_traps);
+  if (Opts.PointerAuthVTPtrAddressDiscrimination)
+    GenerateArg(Consumer, OPT_fptrauth_vtable_pointer_address_discrimination);
+  if (Opts.PointerAuthVTPtrTypeDiscrimination)
+    GenerateArg(Consumer, OPT_fptrauth_vtable_pointer_type_discrimination);
+  if (Opts.PointerAuthInitFini)
+    GenerateArg(Consumer, OPT_fptrauth_init_fini);
 }
 
 static void ParsePointerAuthArgs(LangOptions &Opts, ArgList &Args,
                                  DiagnosticsEngine &Diags) {
   Opts.PointerAuthIntrinsics = Args.hasArg(OPT_fptrauth_intrinsics);
+  Opts.PointerAuthCalls = Args.hasArg(OPT_fptrauth_calls);
+  Opts.PointerAuthReturns = Args.hasArg(OPT_fptrauth_returns);
+  Opts.PointerAuthAuthTraps = Args.hasArg(OPT_fptrauth_auth_traps);
+  Opts.PointerAuthVTPtrAddressDiscrimination =
+      Args.hasArg(OPT_fptrauth_vtable_pointer_address_discrimination);
+  Opts.PointerAuthVTPtrTypeDiscrimination =
+      Args.hasArg(OPT_fptrauth_vtable_pointer_type_discrimination);
+  Opts.PointerAuthInitFini = Args.hasArg(OPT_fptrauth_init_fini);
 }
 
 /// Check if input file kind and language standard are compatible.