[asan] fix the non-x86 build

llvm-svn: 259745

compiler-rt/lib/sanitizer_common/sanitizer_linux.cc

@@ -1156,8 +1156,12 @@ void internal_join_thread(void *th) {}
 #endif
 
 bool GetSigContextWriteFlag(void *context) {
+#if defined(__x86_64__) || defined(__i386__)
   ucontext_t *ucontext = (ucontext_t*)context;
   return ucontext->uc_mcontext.gregs[REG_ERR] & 2;
+#else
+  return false;  // FIXME: Implement.
+#endif
 }
 
 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {

compiler-rt/test/asan/TestCases/Linux/segv_read_write.c

@@ -1,6 +1,7 @@
 // RUN: %clangxx_asan -O0 %s -o %t
 // RUN: not %run %t       2>&1 | FileCheck %s --check-prefix=READ
 // RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE
+// REQUIRES: x86_64-supported-target
 
 static volatile int sink;
 __attribute__((noinline)) void Read(int *ptr) { sink = *ptr; }