[Clang][Sanitizers] Enable NSAN on X86_64 only (#95885)

This is a follow-up to #93783.
The current set of patches covers only x86_64,
therefore we should not enable this flag on arm64 yet.

Author: alexander-shaposhnikov

clang/lib/Driver/ToolChains/Darwin.cpp

@@ -3457,7 +3457,6 @@ SanitizerMask Darwin::getSupportedSanitizers() const {
   Res |= SanitizerKind::PointerCompare;
   Res |= SanitizerKind::PointerSubtract;
   Res |= SanitizerKind::Leak;
-  Res |= SanitizerKind::NumericalStability;
   Res |= SanitizerKind::Fuzzer;
   Res |= SanitizerKind::FuzzerNoLink;
   Res |= SanitizerKind::ObjCCast;
@@ -3474,6 +3473,10 @@ SanitizerMask Darwin::getSupportedSanitizers() const {
        isTargetTvOSSimulator() || isTargetWatchOSSimulator())) {
     Res |= SanitizerKind::Thread;
   }
+
+  if (IsX86_64)
+    Res |= SanitizerKind::NumericalStability;
+
   return Res;
 }
 

clang/lib/Driver/ToolChains/Linux.cpp

@@ -826,7 +826,7 @@ SanitizerMask Linux::getSupportedSanitizers() const {
   if (IsX86_64 || IsAArch64) {
     Res |= SanitizerKind::KernelHWAddress;
   }
-  if (IsX86_64 || IsAArch64)
+  if (IsX86_64)
     Res |= SanitizerKind::NumericalStability;
 
   // Work around "Cannot represent a difference across sections".

clang/test/Driver/fsanitize.c

@@ -462,17 +462,17 @@
 // RUN: %clang --target=x86_64-linux-gnu -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-X86-64-LINUX
 // CHECK-NSAN-X86-64-LINUX: "-fsanitize=numerical"
 
-// RUN: %clang --target=aarch64-unknown-linux-gnu -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-AARCH64-LINUX
-// CHECK-NSAN-AARCH64-LINUX: "-fsanitize=numerical"
+// RUN: not %clang --target=aarch64-unknown-linux-gnu -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-AARCH64-LINUX
+// CHECK-NSAN-AARCH64-LINUX: error: unsupported option '-fsanitize=numerical' for target 'aarch64-unknown-linux-gnu'
 
 // RUN: not %clang --target=mips-unknown-linux -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-MIPS-LINUX
 // CHECK-NSAN-MIPS-LINUX: error: unsupported option '-fsanitize=numerical' for target 'mips-unknown-linux'
 
 // RUN: %clang --target=x86_64-apple-macos -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-X86-64-MACOS
 // CHECK-NSAN-X86-64-MACOS: "-fsanitize=numerical"
 
-// RUN: %clang --target=arm64-apple-macos -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-ARM64-MACOS
-// CHECK-NSAN-ARM64-MACOS: "-fsanitize=numerical"
+// RUN: not %clang --target=arm64-apple-macos -fsanitize=numerical %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NSAN-ARM64-MACOS
+// CHECK-NSAN-ARM64-MACOS: error: unsupported option '-fsanitize=numerical' for target 'arm64-apple-macos'
 
 // RUN: %clang --target=x86_64-apple-darwin -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-X86-64-DARWIN
 // CHECK-TSAN-X86-64-DARWIN-NOT: unsupported option