| # ldexpf.m4 serial 2 |
| dnl Copyright (C) 2011-2020 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_LDEXPF], |
| [ |
| AC_REQUIRE([gl_MATH_H_DEFAULTS]) |
| AC_REQUIRE([gl_FUNC_LDEXP]) |
| |
| dnl Persuade glibc <math.h> to declare ldexpf(). |
| AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
| |
| dnl Test whether ldexpf() exists. We cannot assume that ldexpf(), if it |
| dnl exists, is defined in the same library as ldexp(). This is not the case |
| dnl on FreeBSD, NetBSD, OpenBSD. |
| gl_MATHFUNC([ldexpf], [float], [(float, int)]) |
| if test $gl_cv_func_ldexpf_no_libm = no \ |
| && test $gl_cv_func_ldexpf_in_libm = no; then |
| HAVE_LDEXPF=0 |
| LDEXPF_LIBM="$LDEXP_LIBM" |
| fi |
| AC_SUBST([LDEXPF_LIBM]) |
| ]) |