[clang] [llvm] [llvm][AArch64] Do not inline a function with different signing scheme. (PR #80642)

[Nick Desaulniers via cfe-commits]

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@@ -0,0 +1,43 @@
+; Testcase to check that module with different branch-target-enforcement can
+; be mixed.
+;
+; RUN: llvm-as %s -o %t1.bc
+; RUN: llvm-as %p/Inputs/foo.ll -o %t2.bc
+; RUN: llvm-lto -exported-symbol main \
+; RUN:          -exported-symbol foo \
+; RUN:          -filetype=obj \
+; RUN:           %t2.bc %t1.bc \
+; RUN:           -o %t1.exe 2>&1
+; RUN: llvm-objdump -d %t1.exe | FileCheck --check-prefix=CHECK-DUMP %s
+; RUN: llvm-readelf -n %t1.exe | FileCheck --allow-empty --check-prefix=CHECK-PROP %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-gnu"
+
+declare i32 @foo();
+
+define i32 @main() {
+entry:
+  %add = call i32 @foo()
+  ret i32 %add
+}
+
+!llvm.module.flags = !{!0, !1, !2, !3 }
+!0 = !{i32 8, !"branch-target-enforcement", i32 0}
+!1 = !{i32 8, !"sign-return-address", i32 0}
+!2 = !{i32 8, !"sign-return-address-all", i32 0}
+!3 = !{i32 8, !"sign-return-address-with-bkey", i32 0}
+
+; CHECK-DUMP: <foo>:
+; CHECK-DUMP:     paciasp
+; CHECK-DUMP:     mov     w0, #0x2a
+; CHECK-DUMP:     autiasp
+; CHECK-DUMP:     ret
+; CHECK-DUMP: <main>:
+; CHECK-DUMP-NOT:  paciasp
+; CHECK-DUMP:      str     x30,
+; CHECK-DUMP:      bl      0x14 <main+0x4>
+
+; `main` doesn't support PAC sign-return-address while `foo` does, so in the binary
+; we should not see anything.
+; CHECK-PROP-NOT:   Proper ties: aarch64 feature: PAC
----------------
nickdesaulniers wrote:

is there an extra whitespace in `Proper` and `ties`?

https://github.com/llvm/llvm-project/pull/80642