1 # copysignl.m4 serial 2
2 dnl Copyright (C) 2011 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_COPYSIGNL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 dnl Determine COPYSIGNL_LIBM.
13 gl_MATHFUNC([copysignl], [long double], [(long double, long double)])
14 if test $gl_cv_func_copysignl_no_libm = no \
15 && test $gl_cv_func_copysignl_in_libm = no; then
17 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
18 AC_REQUIRE([gl_FUNC_COPYSIGN])
19 COPYSIGNL_LIBM="$COPYSIGN_LIBM"
24 AC_SUBST([COPYSIGNL_LIBM])