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.
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_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare roundl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare roundl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_DECLS([roundl], , , [#include <math.h>])
+ AC_CHECK_DECLS([roundl], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_roundl" = yes; then
gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);])
if test "$ROUNDL_LIBM" = missing; then
if test "$ac_cv_have_decl_roundl" = yes; then
gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);])
if test "$ROUNDL_LIBM" = missing; then
- if (signbitl (minus_zerol) && !signbitl (roundl (minus_zerol)))
- return 1;
- return 0;
+ if (signbitl (minus_zerol) && !signbitl (my_roundl (minus_zerol)))
+ result |= 1;
+ /* Test whether roundl (-0.3L) is -0.0L. */
+ if (signbitl (-0.3L) && !signbitl (my_roundl (-0.3L)))
+ result |= 2;
+ return result;
- AC_LIBOBJ([roundl])
- AC_CHECK_DECLS([ceill, floorl], , , [#include <math.h>])
+ dnl Find libraries needed to link lib/roundl.c.
+ AC_CHECK_DECLS([ceill, floorl], , , [[#include <math.h>]])