Messages in this thread | | | Date | Thu, 11 Jan 2018 17:58:07 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/3] objtool: Ignore retpoline alternatives |
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On Thu, Jan 11, 2018 at 10:48:26AM -0600, Josh Poimboeuf wrote: > I think I heard that retpolines won't be ported to anything older than > GCC 4.9, so maybe it's safe to use '%='. I don't remember when it was > introduced into GCC though.
root@interlagos:~/tmp# gcc-4.8 -o test test.c root@interlagos:~/tmp# ./test 11
--- test.c
#include <stdio.h>
void main(void) { int val;
asm ("mov $(%=),%0" : "=A" (val));
printf("%d\n", val); }
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