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configure: Fix check_exec_crash for ICL support

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Change the check_exec_crash test to use a function pointer instead of
simply calling the function. The EBP availability test will crash when
compiled with ICL likely due to compiler optimization shenanigans.

Originally the check_exec_crash code was moved out of main to fix a
problem with gcc's treatment of non-leaf main on x86_32. Libav already
moved the code out of main but the addition of the function pointer will
prevent any inlining which fixes the remaining problem.

A function pointer is used since it is compiler agnostic (as opposed to
say __attribute__ ((noinline)) which would only work with gcc compatible
compilers).

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Laurent 2013-05-25 06:01:29 -04:00 committed by Luca Barbato
parent 597208fde1
commit 9495cd170b
1 changed files with 2 additions and 1 deletions
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3
configure vendored
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@ -911,6 +911,7 @@ static void sighandler(int sig){
int foo(void){ int foo(void){
$code $code
} }
int (*func_ptr)(void) = foo;
int main(void){ int main(void){
signal(SIGILL, sighandler); signal(SIGILL, sighandler);
signal(SIGFPE, sighandler); signal(SIGFPE, sighandler);
@ -918,7 +919,7 @@ int main(void){
#ifdef SIGBUS #ifdef SIGBUS
signal(SIGBUS, sighandler); signal(SIGBUS, sighandler);
#endif #endif
foo(); return func_ptr();
} }
EOF EOF
} }