[PATCH] strace: Fix crash caused over-optimization

[Daniel Santos]

Recent versions of gcc are optimizing away the TLS buffer allocated in
main, so we need to tell gcc that it's really used.
---
 winsup/utils/strace.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/utils/strace.cc b/winsup/utils/strace.cc
index beab67b90..1e581b4a4 100644
--- a/winsup/utils/strace.cc
+++ b/winsup/utils/strace.cc
@@ -1192,6 +1192,8 @@ main (int argc, char **argv)
   char buf[CYGTLS_PADSIZE];
 
   memset (buf, 0, sizeof (buf));
+  /* Prevent buf from being optimized away.  */
+  __asm__ __volatile__("" :: "m" (buf));
   exit (main2 (argc, argv));
 }
 
-- 
2.11.0