[flang] [clang] [llvm] [AArch64][Driver] Better handling of target feature dependencies (PR #78270)

[Tomas Matheson via cfe-commits]

================
@@ -1,20 +1,21 @@
 // RAS is off by default for v8a, but can be enabled by +ras (this is not architecturally valid)
 // RUN: %clang --target=aarch64-none-elf -march=armv8a+ras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-RAS %s
+// RUN: %clang --target=aarch64-none-elf -march=armv8.2a+ras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-RAS %s
 // RUN: %clang --target=aarch64-none-elf -march=armv8-a+ras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-RAS %s
 // RUN: %clang --target=aarch64-none-elf -mcpu=generic+ras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-RAS %s
 // RUN: %clang --target=aarch64-none-elf -mcpu=cortex-a75 -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-RAS %s
 // RUN: %clang --target=aarch64-none-elf -mcpu=cortex-a55 -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-RAS %s
 // CHECK-RAS: "-target-feature" "+ras"
 
-// RUN: %clang --target=aarch64-none-elf -march=armv8a+noras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-NORAS %s
-// RUN: %clang --target=aarch64-none-elf -mcpu=generic+noras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-NORAS %s
-// CHECK-NORAS: "-target-feature" "-ras"
+// RUN: %clang --target=aarch64-none-elf -march=armv8a+noras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-ABSENT %s
+// RUN: %clang --target=aarch64-none-elf -mcpu=generic+noras -### -c %s 2>&1 | FileCheck --check-prefix=CHECK-ABSENT %s
+// CHECK-ABSENT-NOT: "-target-feature" ++ras"
----------------
tmatheson-arm wrote:

typo?

https://github.com/llvm/llvm-project/pull/78270