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avx2 configure: Disable if static build

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This avoids a segfault like the following for at least some 4.8 versions
of gcc when configured with --static if avx2 instructions are also
enabled:

	Program received signal SIGSEGV, Segmentation fault.
	buffer_find_nonzero_offset_ifunc () at ./util/cutils.c:333
	333     {
	(gdb) bt
	#0  buffer_find_nonzero_offset_ifunc () at ./util/cutils.c:333
	#1  0x0000000000939c58 in __libc_start_main ()
	#2  0x0000000000419337 in _start ()

Signed-off-by: Aaron Lindsay <alindsay@codeaurora.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aaron Lindsay 2016-07-14 15:38:14 -04:00 committed by Peter Maydell
parent cf4b61d581
commit 71fcd8eb68
1 changed files with 10 additions and 7 deletions
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17
configure vendored
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@ -1788,7 +1788,9 @@ fi
##########################################
# avx2 optimization requirement check
cat > $TMPC << EOF
if test "$static" = "no" ; then
cat > $TMPC << EOF
#pragma GCC push_options
#pragma GCC target("avx2")
#include <cpuid.h>
@ -1801,12 +1803,13 @@ static void *bar_ifunc(void) {return (void*) bar;}
int foo(void *a) __attribute__((ifunc("bar_ifunc")));
int main(int argc, char *argv[]) { return foo(argv[0]);}
EOF
if compile_object "" ; then
if has readelf; then
if readelf --syms $TMPO 2>/dev/null |grep -q "IFUNC.*foo"; then
avx2_opt="yes"
fi
fi
if compile_object "" ; then
if has readelf; then
if readelf --syms $TMPO 2>/dev/null |grep -q "IFUNC.*foo"; then
avx2_opt="yes"
fi
fi
fi
fi
#########################################