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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 19:24:27 +00:00
parent 1fc010cc96
commit 1937d8d9ef
2 changed files with 18 additions and 10 deletions
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10
configure vendored
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@ -11819,7 +11819,6 @@ 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
@ -11828,7 +11827,9 @@ else
cat >conftest.$ac_ext <<_ACEOF
#line $LINENO "configure"
#include "confdefs.h"
#include <math.h>
double glob_double;
#ifdef F77_DUMMY_MAIN
# ifdef __cplusplus
@ -11839,7 +11840,7 @@ else
int
main ()
{
double x = 0.0; int res = isinf(x);
return isinf(glob_double) ? 0 : 1;
;
return 0;
}
@ -12454,7 +12455,10 @@ echo $ECHO_N "checking for finite... $ECHO_C" >&6
cat >conftest.$ac_ext <<_ACEOF
#line $LINENO "configure"
#include "confdefs.h"
#include <math.h>
double glob_double;
#ifdef F77_DUMMY_MAIN
# ifdef __cplusplus
extern "C"
@ -12464,7 +12468,7 @@ cat >conftest.$ac_ext <<_ACEOF
int
main ()
{
int dummy=finite(1.0);
return finite(glob_double) ? 0 : 1;
;
return 0;
}