| 1 | # copysign.m4 serial 1 |
| 2 | dnl Copyright (C) 2011-2014 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. |
| 6 | |
| 7 | AC_DEFUN([gl_FUNC_COPYSIGN], |
| 8 | [ |
| 9 | AC_REQUIRE([gl_MATH_H_DEFAULTS]) |
| 10 | |
| 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 |
| 15 | HAVE_COPYSIGN=0 |
| 16 | COPYSIGN_LIBM= |
| 17 | fi |
| 18 | AC_SUBST([COPYSIGN_LIBM]) |
| 19 | ]) |