-# round.m4 serial 8
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# round.m4 serial 11
+dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_ROUND],
[
+ m4_divert_text([DEFAULTS], [gl_round_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare round().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
exit (x < 0.5 && round (x) != 0.0);
}]])], [gl_cv_func_round_works=yes], [gl_cv_func_round_works=no],
[case "$host_os" in
- netbsd*) gl_cv_func_round_works="guessing no";;
- *) gl_cv_func_round_works="guessing yes";;
+ netbsd* | aix*) gl_cv_func_round_works="guessing no";;
+ *) gl_cv_func_round_works="guessing yes";;
esac
])
LIBS="$save_LIBS"
if test "$ROUND_LIBM" = missing; then
REPLACE_ROUND=1
fi
+ m4_ifdef([gl_FUNC_ROUND_IEEE], [
+ if test $gl_round_required = ieee && test $REPLACE_ROUND = 0; then
+ AC_CACHE_CHECK([whether round works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_round_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $ROUND_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_DOUBLE_MINUS_ZERO_CODE[
+]gl_DOUBLE_SIGNBIT_CODE[
+int main()
+{
+ /* Test whether round (-0.0) is -0.0. */
+ if (signbitd (minus_zerod) && !signbitd (round (minus_zerod)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_round_ieee=yes],
+ [gl_cv_func_round_ieee=no],
+ [gl_cv_func_round_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_round_ieee" in
+ *yes) ;;
+ *) REPLACE_ROUND=1 ;;
+ esac
+ fi
+ ])
else
HAVE_DECL_ROUND=0
fi
if test $HAVE_DECL_ROUND = 0 || test $REPLACE_ROUND = 1; then
- AC_LIBOBJ([round])
+ dnl Find libraries needed to link lib/round.c.
gl_FUNC_FLOOR_LIBS
gl_FUNC_CEIL_LIBS
ROUND_LIBM=