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Make configure test for tanh(-0.) == -0. committed in r62447 actually 

work.  (The test wasn't properly linked with libm.  Sigh.)
This commit is contained in:
Mark Dickinson 2008-04-22 00:54:27 +00:00
parent 60ffcbe88b
commit 7a3d8641a9
2 changed files with 9 additions and 5 deletions
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8
configure vendored
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@ -1,5 +1,5 @@
#! /bin/sh #! /bin/sh
# From configure.in Revision: 62145 . # From configure.in Revision: 62447 .
# Guess values for system-dependent variables and create Makefiles. # Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.61 for python 2.6. # Generated by GNU Autoconf 2.61 for python 2.6.
# #
@ -20852,6 +20852,9 @@ fi
# * Check for mathematical functions * # * Check for mathematical functions *
# ************************************ # ************************************
LIBS_SAVE=$LIBS
LIBS="$LIBS $LIBM"
# On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of # On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of
# -0. on some architectures. # -0. on some architectures.
{ echo "$as_me:$LINENO: checking whether tanh preserves the sign of zero" >&5 { echo "$as_me:$LINENO: checking whether tanh preserves the sign of zero" >&5
@ -20871,6 +20874,7 @@ cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */ /* end confdefs.h. */
#include <math.h> #include <math.h>
#include <stdlib.h>
int main() { int main() {
/* return 0 if either negative zeros don't exist /* return 0 if either negative zeros don't exist
on this platform or if negative zeros exist on this platform or if negative zeros exist
@ -20927,8 +20931,6 @@ _ACEOF
fi fi
LIBS_SAVE=$LIBS
LIBS="$LIBS $LIBM"
for ac_func in hypot for ac_func in hypot
do do

6
configure.in
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@ -2995,12 +2995,16 @@ fi],
# * Check for mathematical functions * # * Check for mathematical functions *
# ************************************ # ************************************
LIBS_SAVE=$LIBS
LIBS="$LIBS $LIBM"
# On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of # On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of
# -0. on some architectures. # -0. on some architectures.
AC_MSG_CHECKING(whether tanh preserves the sign of zero) AC_MSG_CHECKING(whether tanh preserves the sign of zero)
AC_CACHE_VAL(ac_cv_tanh_preserves_zero_sign, [ AC_CACHE_VAL(ac_cv_tanh_preserves_zero_sign, [
AC_TRY_RUN([ AC_TRY_RUN([
#include <math.h> #include <math.h>
#include <stdlib.h>
int main() { int main() {
/* return 0 if either negative zeros don't exist /* return 0 if either negative zeros don't exist
on this platform or if negative zeros exist on this platform or if negative zeros exist
@ -3020,8 +3024,6 @@ then
[Define if tanh(-0.) is -0., or if platform doesn't have signed zeros]) [Define if tanh(-0.) is -0., or if platform doesn't have signed zeros])
fi fi
LIBS_SAVE=$LIBS
LIBS="$LIBS $LIBM"
AC_REPLACE_FUNCS(hypot) AC_REPLACE_FUNCS(hypot)
AC_CHECK_FUNCS(acosh asinh atanh copysign expm1 finite isinf isnan log1p) AC_CHECK_FUNCS(acosh asinh atanh copysign expm1 finite isinf isnan log1p)