1# getline.m4 serial 15 2 3dnl Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006 Free Software 4dnl Foundation, Inc. 5dnl 6dnl This file is free software; the Free Software Foundation 7dnl gives unlimited permission to copy and/or distribute it, 8dnl with or without modifications, as long as this notice is preserved. 9 10AC_PREREQ(2.52) 11 12dnl See if there's a working, system-supplied version of the getline function. 13dnl We can't just do AC_REPLACE_FUNCS(getline) because some systems 14dnl have a function by that name in -linet that doesn't have anything 15dnl to do with the function we need. 16AC_DEFUN([gl_FUNC_GETLINE], 17[ 18 dnl Persuade glibc <stdio.h> to declare getline(). 19 AC_REQUIRE([AC_GNU_SOURCE]) 20 21 AC_CHECK_DECLS([getline]) 22 23 gl_getline_needs_run_time_check=no 24 AC_CHECK_FUNC(getline, 25 dnl Found it in some library. Verify that it works. 26 gl_getline_needs_run_time_check=yes, 27 am_cv_func_working_getline=no) 28 if test $gl_getline_needs_run_time_check = yes; then 29 AC_CACHE_CHECK([for working getline function], am_cv_func_working_getline, 30 [echo fooN |tr -d '\012'|tr N '\012' > conftest.data 31 AC_TRY_RUN([ 32# include <stdio.h> 33# include <stdlib.h> 34# include <string.h> 35 int main () 36 { /* Based on a test program from Karl Heuer. */ 37 char *line = NULL; 38 size_t siz = 0; 39 int len; 40 FILE *in = fopen ("./conftest.data", "r"); 41 if (!in) 42 return 1; 43 len = getline (&line, &siz, in); 44 exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1); 45 } 46 ], am_cv_func_working_getline=yes dnl The library version works. 47 , am_cv_func_working_getline=no dnl The library version does NOT work. 48 , dnl We're cross compiling. Assume it works on glibc2 systems. 49 [AC_EGREP_CPP([Lucky GNU user], 50 [ 51#include <features.h> 52#ifdef __GNU_LIBRARY__ 53 #if (__GLIBC__ >= 2) 54 Lucky GNU user 55 #endif 56#endif 57 ], 58 [am_cv_func_working_getline=yes], 59 [am_cv_func_working_getline=no])] 60 )]) 61 fi 62 63 if test $am_cv_func_working_getline = no; then 64 dnl We must choose a different name for our function, since on ELF systems 65 dnl a broken getline() in libc.so would override our getline() in 66 dnl libgettextlib.so. 67 AC_DEFINE([getline], [gnu_getline], 68 [Define to a replacement function name for getline().]) 69 AC_LIBOBJ(getline) 70 71 gl_PREREQ_GETLINE 72 fi 73]) 74 75# Prerequisites of lib/getline.c. 76AC_DEFUN([gl_PREREQ_GETLINE], 77[ 78 gl_FUNC_GETDELIM 79]) 80