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# floor.m4 serial 3
dnl Copyright (C) 2007, 2009 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_FLOOR],
[
dnl Test whether floor() can be used without libm.
gl_FUNC_FLOOR_LIBS
if test "$FLOOR_LIBM" = "?"; then
FLOOR_LIBM=
fi
AC_SUBST([FLOOR_LIBM])
])
# Determines the libraries needed to get the floor() function.
# Sets FLOOR_LIBM.
AC_DEFUN([gl_FUNC_FLOOR_LIBS],
[
gl_CACHE_VAL_SILENT([gl_cv_func_floor_libm], [
gl_cv_func_floor_libm=?
AC_TRY_LINK([
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
double x;],
[x = floor(x);],
[gl_cv_func_floor_libm=])
if test "$gl_cv_func_floor_libm" = "?"; then
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_TRY_LINK([
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
double x;],
[x = floor(x);],
[gl_cv_func_floor_libm="-lm"])
LIBS="$save_LIBS"
fi
])
FLOOR_LIBM="$gl_cv_func_floor_libm"
])
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