Add check for C99 round function to configure, and define
a fallback function if round doesn't exist.
diff --git a/Include/pymath.h b/Include/pymath.h
index 8872e8a..816691a 100644
--- a/Include/pymath.h
+++ b/Include/pymath.h
@@ -22,6 +22,10 @@
extern double copysign(double, double);
#endif
+#ifndef HAVE_ROUND
+extern double round(double);
+#endif
+
#ifndef HAVE_ACOSH
extern double acosh(double);
#endif
diff --git a/Python/pymath.c b/Python/pymath.c
index 2e049be..eb06eb2 100644
--- a/Python/pymath.c
+++ b/Python/pymath.c
@@ -69,6 +69,19 @@
}
#endif /* HAVE_COPYSIGN */
+#ifndef HAVE_ROUND
+double
+round(double x)
+{
+ double absx, y;
+ absx = fabs(x);
+ y = floor(absx);
+ if (absx - y >= 0.5)
+ y += 1.0;
+ return copysign(y, x);
+}
+#endif /* HAVE_ROUND */
+
#ifndef HAVE_LOG1P
#include <float.h>
diff --git a/configure b/configure
index f4ee310..de5c354 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
#! /bin/sh
-# From configure.in Revision: 71274 .
+# From configure.in Revision: 71663 .
# Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.61 for python 3.1.
#
@@ -22310,7 +22310,8 @@
-for ac_func in acosh asinh atanh copysign expm1 finite hypot log1p
+
+for ac_func in acosh asinh atanh copysign expm1 finite hypot log1p round
do
as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
{ echo "$as_me:$LINENO: checking for $ac_func" >&5
diff --git a/configure.in b/configure.in
index b3bd00f..7f7dc7f 100644
--- a/configure.in
+++ b/configure.in
@@ -3337,7 +3337,7 @@
[Define if tanh(-0.) is -0., or if platform doesn't have signed zeros])
fi
-AC_CHECK_FUNCS([acosh asinh atanh copysign expm1 finite hypot log1p])
+AC_CHECK_FUNCS([acosh asinh atanh copysign expm1 finite hypot log1p round])
AC_CHECK_DECLS([isinf, isnan, isfinite], [], [], [[#include <math.h>]])
LIBS=$LIBS_SAVE
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 72f5fb3..1807d80 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -521,6 +521,9 @@
/* Define if you have readline 4.0 */
#undef HAVE_RL_PRE_INPUT_HOOK
+/* Define to 1 if you have the `round' function. */
+#undef HAVE_ROUND
+
/* Define to 1 if you have the `select' function. */
#undef HAVE_SELECT