| # printf-frexp.m4 serial 5 |
| dnl Copyright (C) 2007, 2009-2012 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 Check how to define printf_frexp() without linking with libm. |
| |
| AC_DEFUN([gl_FUNC_PRINTF_FREXP], |
| [ |
| AC_REQUIRE([gl_CHECK_FREXP_NO_LIBM]) |
| if test $gl_cv_func_frexp_no_libm = yes; then |
| gl_FUNC_FREXP_WORKS |
| case "$gl_cv_func_frexp_works" in |
| *yes) |
| AC_DEFINE([HAVE_FREXP_IN_LIBC], [1], |
| [Define if the frexp function is available in libc.]) |
| ;; |
| esac |
| fi |
| |
| AC_CACHE_CHECK([whether ldexp can be used without linking with libm], |
| [gl_cv_func_ldexp_no_libm], |
| [ |
| AC_LINK_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#include <math.h> |
| double x; |
| int y;]], |
| [[return ldexp (x, y) < 1;]])], |
| [gl_cv_func_ldexp_no_libm=yes], |
| [gl_cv_func_ldexp_no_libm=no]) |
| ]) |
| if test $gl_cv_func_ldexp_no_libm = yes; then |
| AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1], |
| [Define if the ldexp function is available in libc.]) |
| fi |
| ]) |
