On 11/17/2013 09:36 AM, Olivier Langlois wrote:
Hi,
This is probably more a gcc issue and maybe I am not the first one
reporting you the issue but a bunch of tests are segfaulting when
building pixman 0.32.2. If I comment out the 4-5 lines of code in
test/utils-prng.h defining GCC_VECTOR_EXTENSIONS_SUPPORTED, the
segfaults goes away.
Hi,
I have kept looking on this problem. While removing gcc vector extension
code did help a lot, I was still having 2-3 segfaults.
from region-contains-test, matrix-test and stress-test.
I think that I have nailed the real problem. It comes from an
incompatibility between the assembly code in:
static uint32_t
call_test_function (uint32_t (*test_function)(int testnum, int verbose),
int testnum,
int verbose)
{
uint32_t retval;
#if defined (__GNUC__) && (defined (__i386) || defined (__i386__))
__asm__ (
/* Deliberately avoid aligning the stack to 16 bytes */
"pushl %1\n\t"
"pushl %2\n\t"
"call *%3\n\t"
"addl $8, %%esp\n\t"
: "=a" (retval)
: "r" (verbose),
"r" (testnum),
"r" (test_function)
: "edx", "ecx"); /* caller save registers */
#else
retval = test_function (testnum, verbose);
#endif
return retval;
}
and gcc switch -fstack-protector.
I had these CFLAGS: -D_FORTIFY_SOURCE=2 -fstack-protector
--param=ssp-buffer-size=4
by removing them, the crashes went away.
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