2 dnl Copyright (C) 2011-2020 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_COPYSIGN],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
11 dnl Determine COPYSIGN_LIBM.
12 gl_MATHFUNC([copysign], [double], [(double, double)])
13 if test $gl_cv_func_copysign_no_libm = no \
14 && test $gl_cv_func_copysign_in_libm = no; then
18 AC_SUBST([COPYSIGN_LIBM])