From 4e657713e97a0e0b0ea907d5f8348fc3fedad70a Mon Sep 17 00:00:00 2001
From: cryptoad <cryptoad@91177308-0d34-0410-b5e6-96231b3b80d8>
Date: Thu, 9 Aug 2018 20:01:11 +0000
Subject: [PATCH] [sanitizer] Remove rsp from the clobber list in
 internal_clone

Summary:
When compiling with WERROR=ON, a new fatal warning started popping up recently
(due to -Werror,-Winline-asm):
```
.../lib/sanitizer_common/sanitizer_linux.cc:1214:24: error: inline asm clobber list contains reserved registers: RSP [-Werror,-Winline-asm]
                       "syscall\n"
                       ^
<inline asm>:1:1: note: instantiated into assembly here
        syscall
^
.../lib/sanitizer_common/sanitizer_linux.cc:1214:24: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
                       "syscall\n"
                       ^
<inline asm>:1:1: note: instantiated into assembly here
        syscall
^
```

Removing `rsp` from the clobber list makes the warning go away, and does not
appear to have a functional impact. If there is another way to solve this, let
me know.

Reviewers: eugenis, vitalybuka

Reviewed By: eugenis

Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D50519

git-svn-id: http://llvm.org/svn/llvm-project/compiler-rt/trunk@339370 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/sanitizer_common/sanitizer_linux.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sanitizer_common/sanitizer_linux.cc b/lib/sanitizer_common/sanitizer_linux.cc
index 6b8b9fd2e..8d39c4d90 100644
--- a/lib/sanitizer_common/sanitizer_linux.cc
+++ b/lib/sanitizer_common/sanitizer_linux.cc
@@ -1244,7 +1244,7 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
                          "d"(parent_tidptr),
                          "r"(r8),
                          "r"(r10)
-                       : "rsp", "memory", "r11", "rcx");
+                       : "memory", "r11", "rcx");
   return res;
 }
 #elif defined(__mips__)
-- 
2.19.2