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Use a more bulletproof test for whether finite() and isinf() are present.

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It seems that recent gcc versions can optimize away calls to these functions
even when the functions do not exist on the platform, resulting in a bogus
positive result.  Avoid this by using a non-constant argument and ensuring
that the function result is not simply discarded.  Per report from
François Laupretre.
This commit is contained in:
Tom Lane
2006-01-12 19:23:41 +00:00
parent 34b0ac6ada
commit e2c60a2cfe
2 changed files with 18 additions and 10 deletions
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10
configure vendored
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@ -14241,7 +14241,6 @@ fi
# do this one the hard way in case isinf() is a macro
echo "$as_me:$LINENO: checking for isinf" >&5
echo $ECHO_N "checking for isinf... $ECHO_C" >&6
if test "${ac_cv_func_isinf+set}" = set; then
@ -14253,12 +14252,14 @@ _ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <math.h>
double glob_double;
int
main ()
{
double x = 0.0; int res = isinf(x);
return isinf(glob_double) ? 0 : 1;
;
return 0;
}
@ -15138,11 +15139,14 @@ _ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <math.h>
double glob_double;
int
main ()
{
int dummy=finite(1.0);
return finite(glob_double) ? 0 : 1;
;
return 0;
}