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Try harder to detect unavailability of __builtin_mul_overflow(int64).

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Commit c04d35f44 didn't quite do the job here, because it still allowed
the compiler to deduce that the function call could be optimized away.
Prevent that by putting the arguments and results in global variables.

Discussion: https://postgr.es/m/20171213213754.pydkyjs6bt2hvsdb@alap3.anarazel.de
This commit is contained in:
Tom Lane
2017-12-17 11:52:22 -05:00
parent b31a9d7dd3
commit c6d21d56f1
2 changed files with 14 additions and 12 deletions
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9
configure vendored
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@ -14485,14 +14485,15 @@ else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
PG_INT64_TYPE a = 1;
PG_INT64_TYPE b = 1;
PG_INT64_TYPE result;
__builtin_mul_overflow(*(volatile PG_INT64_TYPE *) a, *(volatile PG_INT64_TYPE *) b, &result);
int oflo;
int
main ()
{
oflo = __builtin_mul_overflow(a, b, &result);
;
return 0;
}