1# getline.m4 serial 17 2 3dnl Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007 Free 4dnl Software 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([2.60]) 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 AC_REQUIRE([gl_STDIO_H_DEFAULTS]) 19 20 dnl Persuade glibc <stdio.h> to declare getline(). 21 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 22 23 AC_CHECK_DECLS_ONCE([getline]) 24 25 gl_getline_needs_run_time_check=no 26 AC_CHECK_FUNC(getline, 27 dnl Found it in some library. Verify that it works. 28 gl_getline_needs_run_time_check=yes, 29 am_cv_func_working_getline=no) 30 if test $gl_getline_needs_run_time_check = yes; then 31 AC_CACHE_CHECK([for working getline function], am_cv_func_working_getline, 32 [echo fooN |tr -d '\012'|tr N '\012' > conftest.data 33 AC_TRY_RUN([ 34# include <stdio.h> 35# include <stdlib.h> 36# include <string.h> 37 int main () 38 { /* Based on a test program from Karl Heuer. */ 39 char *line = NULL; 40 size_t siz = 0; 41 int len; 42 FILE *in = fopen ("./conftest.data", "r"); 43 if (!in) 44 return 1; 45 len = getline (&line, &siz, in); 46 exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1); 47 } 48 ], am_cv_func_working_getline=yes dnl The library version works. 49 , am_cv_func_working_getline=no dnl The library version does NOT work. 50 , dnl We're cross compiling. Assume it works on glibc2 systems. 51 [AC_EGREP_CPP([Lucky GNU user], 52 [ 53#include <features.h> 54#ifdef __GNU_LIBRARY__ 55 #if (__GLIBC__ >= 2) 56 Lucky GNU user 57 #endif 58#endif 59 ], 60 [am_cv_func_working_getline=yes], 61 [am_cv_func_working_getline=no])] 62 )]) 63 fi 64 65 if test $ac_cv_have_decl_getline = no; then 66 HAVE_DECL_GETLINE=0 67 fi 68 69 if test $am_cv_func_working_getline = no; then 70 REPLACE_GETLINE=1 71 AC_LIBOBJ([getline]) 72 73 gl_PREREQ_GETLINE 74 fi 75]) 76 77# Prerequisites of lib/getline.c. 78AC_DEFUN([gl_PREREQ_GETLINE], 79[ 80 gl_FUNC_GETDELIM 81]) 82