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# copysign.m4 serial 1
dnl Copyright (C) 2011-2023 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_COPYSIGN],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Determine COPYSIGN_LIBM.
gl_MATHFUNC([copysign], [double], [(double, double)])
if test $gl_cv_func_copysign_no_libm = no \
&& test $gl_cv_func_copysign_in_libm = no; then
HAVE_COPYSIGN=0
COPYSIGN_LIBM=
fi
AC_SUBST([COPYSIGN_LIBM])
])
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