================
@@ -797,6 +798,21 @@ bool AArch64Arm64ECCallLowering::runOnModule(Module &Mod) {
// Check if this module has the cfguard flag and read its value.
CFGuardModuleFlag = M->getControlFlowGuardMode();
+ // Warn if the module flag requests an unsupported CFGuard mechanism.
+ if (CFGuardModuleFlag == ControlFlowGuardMode::Enabled) {
+ if (auto *CI = mdconst::dyn_extract_or_null<ConstantInt>(
+ Mod.getModuleFlag("cfguard-mechanism"))) {
----------------
dpaoliello wrote:
Fair enough. Added docs for both the existing `cfguard` and new
`cfguard-mechanism` flags.
https://github.com/llvm/llvm-project/pull/176276
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