[Driver] Error when using msan on Android (#122540)

Msan is not supported on Android as mentioned in google/sanitizers#1381.
We proactively give the warning saying it is unsupported to fix
android/ndk#1958.

Author: Sharjeel-Khan

clang/lib/Driver/ToolChains/Linux.cpp

@@ -823,6 +823,7 @@ SanitizerMask Linux::getSupportedSanitizers() const {
   const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64;
   const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz;
   const bool IsHexagon = getTriple().getArch() == llvm::Triple::hexagon;
+  const bool IsAndroid = getTriple().isAndroid();
   SanitizerMask Res = ToolChain::getSupportedSanitizers();
   Res |= SanitizerKind::Address;
   Res |= SanitizerKind::PointerCompare;
@@ -831,7 +832,6 @@ SanitizerMask Linux::getSupportedSanitizers() const {
   Res |= SanitizerKind::Fuzzer;
   Res |= SanitizerKind::FuzzerNoLink;
   Res |= SanitizerKind::KernelAddress;
-  Res |= SanitizerKind::Memory;
   Res |= SanitizerKind::Vptr;
   Res |= SanitizerKind::SafeStack;
   if (IsX86_64 || IsMIPS64 || IsAArch64 || IsLoongArch64)
@@ -857,6 +857,8 @@ SanitizerMask Linux::getSupportedSanitizers() const {
   }
   if (IsX86_64)
     Res |= SanitizerKind::NumericalStability;
+  if (!IsAndroid)
+    Res |= SanitizerKind::Memory;
 
   // Work around "Cannot represent a difference across sections".
   if (getTriple().getArch() == llvm::Triple::ppc64)

clang/test/Driver/fsanitize.c

@@ -399,6 +399,11 @@
 // RUN: %clang --target=arm-linux-androideabi %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ANDROID-NO-ASAN
 // CHECK-ANDROID-NO-ASAN: "-mrelocation-model" "pic"
 
+// RUN: not %clang --target=aarch64-linux-android -fsanitize=memory %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-MSAN-ANDROID
+// RUN: not %clang --target=i386-linux-android -fsanitize=memory %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-MSAN-ANDROID
+// RUN: not %clang --target=x86_64-linux-android -fsanitize=memory %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-MSAN-ANDROID
+// CHECK-MSAN-ANDROID: unsupported option '-fsanitize=memory' for target
+
 // RUN: %clang --target=x86_64-linux-gnu %s -fsanitize=undefined -### 2>&1 | FileCheck %s --check-prefix=CHECK-RECOVER-UBSAN
 // RUN: %clang --target=x86_64-linux-gnu %s -fsanitize=undefined -fsanitize-recover -### 2>&1 | FileCheck %s --check-prefix=CHECK-RECOVER-UBSAN
 // RUN: %clang --target=x86_64-linux-gnu %s -fsanitize=undefined -fsanitize-recover=all -### 2>&1 | FileCheck %s --check-prefix=CHECK-RECOVER-UBSAN