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 ]) 39
