tsan: remove unneeded ___chkstk_ms function from Go runtime

llvm-svn: 191161

compiler-rt/lib/tsan/go/buildgo.sh

@@ -26,7 +26,7 @@ SRCS="
 
 if [ "`uname -a | grep Linux`" != "" ]; then
 	SUFFIX="linux_amd64"
-	OSCFLAGS="-fPIC -ffreestanding -Wno-maybe-uninitialized"
+	OSCFLAGS="-fPIC -ffreestanding -Wno-maybe-uninitialized -Werror"
 	OSLDFLAGS="-lpthread -fPIC -fpie"
 	SRCS+="
 		../rtl/tsan_platform_linux.cc
@@ -65,7 +65,7 @@ for F in $SRCS; do
 	cat $F >> gotsan.cc
 done
 
-FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -m64 -Wall -Werror -fno-exceptions -fno-rtti -DTSAN_GO -DSANITIZER_GO -DTSAN_SHADOW_COUNT=4 $OSCFLAGS"
+FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -m64 -Wall -fno-exceptions -fno-rtti -DTSAN_GO -DSANITIZER_GO -DTSAN_SHADOW_COUNT=4 $OSCFLAGS"
 if [ "$DEBUG" == "" ]; then
 	FLAGS+=" -DTSAN_DEBUG=0 -O3 -fomit-frame-pointer"
 else

compiler-rt/lib/tsan/go/tsan_go.cc

@@ -186,40 +186,6 @@ void __tsan_finalizer_goroutine(ThreadState *thr) {
   AcquireGlobal(thr, 0);
 }
 
-#if SANITIZER_WINDOWS
-// MinGW gcc emits calls to the function.
-void ___chkstk_ms(void) {
-// The implementation must be along the lines of:
-// .code64
-// PUBLIC ___chkstk_ms
-//     //cfi_startproc()
-// ___chkstk_ms:
-//     push rcx
-//     //cfi_push(%rcx)
-//     push rax
-//     //cfi_push(%rax)
-//     cmp rax, PAGE_SIZE
-//     lea rcx, [rsp + 24]
-//     jb l_LessThanAPage
-// .l_MoreThanAPage:
-//     sub rcx, PAGE_SIZE
-//     or rcx, 0
-//     sub rax, PAGE_SIZE
-//     cmp rax, PAGE_SIZE
-//     ja l_MoreThanAPage
-// .l_LessThanAPage:
-//     sub rcx, rax
-//     or [rcx], 0
-//     pop rax
-//     //cfi_pop(%rax)
-//     pop rcx
-//     //cfi_pop(%rcx)
-//     ret
-//     //cfi_endproc()
-// END
-}
-#endif
-
 }  // extern "C"
 }  // namespace __tsan