diff options
| -rwxr-xr-x | configure | 76 | ||||
| -rw-r--r-- | configure.in | 26 | ||||
| -rw-r--r-- | pyconfig.h.in | 3 |
3 files changed, 105 insertions, 0 deletions
@@ -20851,6 +20851,82 @@ fi # ************************************ # * Check for mathematical functions * # ************************************ + +# On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of +# -0. on some architectures. +{ echo "$as_me:$LINENO: checking whether tanh preserves the sign of zero" >&5 +echo $ECHO_N "checking whether tanh preserves the sign of zero... $ECHO_C" >&6; } +if test "${ac_cv_tanh_preserves_zero_sign+set}" = set; then + echo $ECHO_N "(cached) $ECHO_C" >&6 +else + +if test "$cross_compiling" = yes; then + ac_cv_tanh_preserves_zero_sign=no +else + cat >conftest.$ac_ext <<_ACEOF +/* confdefs.h. */ +_ACEOF +cat confdefs.h >>conftest.$ac_ext +cat >>conftest.$ac_ext <<_ACEOF +/* end confdefs.h. */ + +#include <math.h> +int main() { + /* return 0 if either negative zeros don't exist + on this platform or if negative zeros exist + and tanh(-0.) == -0. */ + if (atan2(0., -1.) == atan2(-0., -1.) || + atan2(tanh(-0.), -1.) == atan2(-0., -1.)) exit(0); + else exit(1); +} + +_ACEOF +rm -f conftest$ac_exeext +if { (ac_try="$ac_link" +case "(($ac_try" in + *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;; + *) ac_try_echo=$ac_try;; +esac +eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5 + (eval "$ac_link") 2>&5 + ac_status=$? + echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); } && { ac_try='./conftest$ac_exeext' + { (case "(($ac_try" in + *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;; + *) ac_try_echo=$ac_try;; +esac +eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5 + (eval "$ac_try") 2>&5 + ac_status=$? + echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); }; }; then + ac_cv_tanh_preserves_zero_sign=yes +else + echo "$as_me: program exited with status $ac_status" >&5 +echo "$as_me: failed program was:" >&5 +sed 's/^/| /' conftest.$ac_ext >&5 + +( exit $ac_status ) +ac_cv_tanh_preserves_zero_sign=no +fi +rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext +fi + + +fi + +{ echo "$as_me:$LINENO: result: $ac_cv_tanh_preserves_zero_sign" >&5 +echo "${ECHO_T}$ac_cv_tanh_preserves_zero_sign" >&6; } +if test "$ac_cv_tanh_preserves_zero_sign" = yes +then + +cat >>confdefs.h <<\_ACEOF +#define TANH_PRESERVES_ZERO_SIGN 1 +_ACEOF + +fi + LIBS_SAVE=$LIBS LIBS="$LIBS $LIBM" diff --git a/configure.in b/configure.in index 05dd87a..4d72321 100644 --- a/configure.in +++ b/configure.in @@ -2994,6 +2994,32 @@ fi], # ************************************ # * Check for mathematical functions * # ************************************ + +# On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of +# -0. on some architectures. +AC_MSG_CHECKING(whether tanh preserves the sign of zero) +AC_CACHE_VAL(ac_cv_tanh_preserves_zero_sign, [ +AC_TRY_RUN([ +#include <math.h> +int main() { + /* return 0 if either negative zeros don't exist + on this platform or if negative zeros exist + and tanh(-0.) == -0. */ + if (atan2(0., -1.) == atan2(-0., -1.) || + atan2(tanh(-0.), -1.) == atan2(-0., -1.)) exit(0); + else exit(1); +} +], +ac_cv_tanh_preserves_zero_sign=yes, +ac_cv_tanh_preserves_zero_sign=no, +ac_cv_tanh_preserves_zero_sign=no)]) +AC_MSG_RESULT($ac_cv_tanh_preserves_zero_sign) +if test "$ac_cv_tanh_preserves_zero_sign" = yes +then + AC_DEFINE(TANH_PRESERVES_ZERO_SIGN, 1, + [Define if tanh(-0.) is -0., or if platform doesn't have signed zeros]) +fi + LIBS_SAVE=$LIBS LIBS="$LIBS $LIBM" AC_REPLACE_FUNCS(hypot) diff --git a/pyconfig.h.in b/pyconfig.h.in index 425ebee..8c9fd16 100644 --- a/pyconfig.h.in +++ b/pyconfig.h.in @@ -921,6 +921,9 @@ (which you can't on SCO ODT 3.0). */ #undef SYS_SELECT_WITH_SYS_TIME +/* Define if tanh(-0.) is -0., or if platform doesn't have signed zeros */ +#undef TANH_PRESERVES_ZERO_SIGN + /* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */ #undef TIME_WITH_SYS_TIME |