| Ying Wang | 0543663 | 2013-04-05 16:01:00 -0700 | [diff] [blame] | 1 | # printf-frexp.m4 serial 5 |
| 2 | dnl Copyright (C) 2007, 2009-2012 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 | dnl Check how to define printf_frexp() without linking with libm. |
| 8 | |
| 9 | AC_DEFUN([gl_FUNC_PRINTF_FREXP], |
| 10 | [ |
| 11 | AC_REQUIRE([gl_CHECK_FREXP_NO_LIBM]) |
| 12 | if test $gl_cv_func_frexp_no_libm = yes; then |
| 13 | gl_FUNC_FREXP_WORKS |
| 14 | case "$gl_cv_func_frexp_works" in |
| 15 | *yes) |
| 16 | AC_DEFINE([HAVE_FREXP_IN_LIBC], [1], |
| 17 | [Define if the frexp function is available in libc.]) |
| 18 | ;; |
| 19 | esac |
| 20 | fi |
| 21 | |
| 22 | AC_CACHE_CHECK([whether ldexp can be used without linking with libm], |
| 23 | [gl_cv_func_ldexp_no_libm], |
| 24 | [ |
| 25 | AC_LINK_IFELSE( |
| 26 | [AC_LANG_PROGRAM( |
| 27 | [[#include <math.h> |
| 28 | double x; |
| 29 | int y;]], |
| 30 | [[return ldexp (x, y) < 1;]])], |
| 31 | [gl_cv_func_ldexp_no_libm=yes], |
| 32 | [gl_cv_func_ldexp_no_libm=no]) |
| 33 | ]) |
| 34 | if test $gl_cv_func_ldexp_no_libm = yes; then |
| 35 | AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1], |
| 36 | [Define if the ldexp function is available in libc.]) |
| 37 | fi |
| 38 | ]) |