2 dnl Copyright (C) 2011-2018 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_FABSF],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_FUNC_FABS])
12 dnl Persuade glibc <math.h> to declare fabsf().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 dnl Test whether fabsf() exists. We cannot assume that fabsf(), if it
16 dnl exists, is defined in the same library as fabs(). This is not the case
17 dnl on FreeBSD, NetBSD, OpenBSD.
18 gl_MATHFUNC([fabsf], [float], [(float)])
19 if test $gl_cv_func_fabsf_no_libm = no \
20 && test $gl_cv_func_fabsf_in_libm = no; then
22 FABSF_LIBM="$FABS_LIBM"
24 AC_SUBST([FABSF_LIBM])