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(isinf, isnan): Use a volatile global to stop gcc

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optimizing out the test.  In particular this fixes solaris where there
isn't an isinf or isnan (though gcc still optimizes as if there is).
Reported by Hugh Sasse.
(AC_C_VOLATILE): New.
This commit is contained in:
Kevin Ryde 2007-01-22 22:55:09 +00:00
parent bedbbb191f
commit 84e4596bd0
1 changed files with 11 additions and 6 deletions
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17
configure.in
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@ -224,6 +224,9 @@ fi
AC_C_CONST
# "volatile" is used in a couple of tests below.
AC_C_VOLATILE
AC_C_INLINE
if test "$ac_cv_c_inline" != no; then
SCM_I_GSC_C_INLINE="\"${ac_cv_c_inline}\""
@ -958,17 +961,19 @@ AC_CHECK_FUNCS(asinh acosh atanh copysign finite sincos trunc)
# use <math.h> so doesn't detect on macro-only systems like HP-UX.
#
AC_MSG_CHECKING([for isinf])
AC_LINK_IFELSE(
[#include <math.h>
int main () { return (isinf(0.0) != 0); }],
AC_LINK_IFELSE(AC_LANG_SOURCE(
[[#include <math.h>
volatile double x = 0.0;
int main () { return (isinf(x) != 0); }]]),
[AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_ISINF, 1,
[Define to 1 if you have the `isinf' macro or function.])],
[AC_MSG_RESULT([no])])
AC_MSG_CHECKING([for isnan])
AC_LINK_IFELSE(
[#include <math.h>
int main () { return (isnan(0.0) != 0); }],
AC_LINK_IFELSE(AC_LANG_SOURCE(
[[#include <math.h>
volatile double x = 0.0;
int main () { return (isnan(x) != 0); }]]),
[AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_ISNAN, 1,
[Define to 1 if you have the `isnan' macro or function.])],