| # copysign.m4 | |
| # serial 1 | |
| dnl Copyright (C) 2011-2026 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. | |
| dnl This file is offered as-is, without any warranty. | |
| 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]) | |
| ]) |