From 865c17fb28f8c3275fd94da6ee4ac51472ec874a Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Wed, 12 Sep 2018 06:51:18 -0700
Subject: closes bpo-34640: Remove the TANH_PRESERVES_ZERO_SIGN configure
 check. (GH-9206)

---
 configure | 47 -----------------------------------------------
 1 file changed, 47 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 9520446d5d..fe642c439a 100755
--- a/configure
+++ b/configure
@@ -14163,53 +14163,6 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
-# On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of
-# -0. on some architectures.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether tanh preserves the sign of zero" >&5
-$as_echo_n "checking whether tanh preserves the sign of zero... " >&6; }
-if ${ac_cv_tanh_preserves_zero_sign+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-if test "$cross_compiling" = yes; then :
-  ac_cv_tanh_preserves_zero_sign=no
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#include <math.h>
-#include <stdlib.h>
-int main() {
-    /* return 0 if either negative zeros don't exist
-       on this platform or if negative zeros exist
-       and tanh(-0.) == -0. */
-  if (atan2(0., -1.) == atan2(-0., -1.) ||
-      atan2(tanh(-0.), -1.) == atan2(-0., -1.)) exit(0);
-  else exit(1);
-}
-
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-  ac_cv_tanh_preserves_zero_sign=yes
-else
-  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.beam conftest.$ac_ext
-fi
-
-fi
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_tanh_preserves_zero_sign" >&5
-$as_echo "$ac_cv_tanh_preserves_zero_sign" >&6; }
-if test "$ac_cv_tanh_preserves_zero_sign" = yes
-then
-
-$as_echo "#define TANH_PRESERVES_ZERO_SIGN 1" >>confdefs.h
-
-fi
-LIBS=$LIBS_SAVE
-
 # For multiprocessing module, check that sem_open
 # actually works.  For FreeBSD versions <= 7.2,
 # the kernel module that provides POSIX semaphores
-- 
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