[Bug c/67265] [x86] 'asm' operand has impossible constraints with -fstack-check

[gnu at JonnyJD dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67265

--- Comment #1 from Johannes Dewender <gnu at JonnyJD dot net> ---
Created attachment 36210
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36210&action=edit
Makefile with failing, working and workaround flags

I found the bug using gcc 5.2.0 (Arch Linux), but I also tested gcc 5.1.0 and
gcc 4.9.2.
So this is not a brand new bug. Not sure if it did work as expected in versions
before that.