1 # getline.m4 serial 19 2 3 dnl Copyright (C) 1998-2003, 2005-2007, 2009 Free Software Foundation, Inc. 4 dnl 5 dnl This file is free software; the Free Software Foundation 6 dnl gives unlimited permission to copy and/or distribute it, 7 dnl with or without modifications, as long as this notice is preserved. 8 9 AC_PREREQ([2.59]) 10 11 dnl See if there's a working, system-supplied version of the getline function. 12 dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems 13 dnl have a function by that name in -linet that doesn't have anything 14 dnl to do with the function we need. 15 AC_DEFUN([gl_FUNC_GETLINE], 16 [ 17 AC_REQUIRE([gl_STDIO_H_DEFAULTS]) 18 19 dnl Persuade glibc <stdio.h> to declare getline(). 20 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 21 22 AC_CHECK_DECLS_ONCE([getline]) 23 24 gl_getline_needs_run_time_check=no 25 AC_CHECK_FUNC([getline], 26 dnl Found it in some library. Verify that it works. 27 gl_getline_needs_run_time_check=yes, 28 am_cv_func_working_getline=no) 29 if test $gl_getline_needs_run_time_check = yes; then 30 AC_CACHE_CHECK([for working getline function], [am_cv_func_working_getline], 31 [echo fooN |tr -d '\012'|tr N '\012' > conftest.data 32 AC_TRY_RUN([ 33 # include <stdio.h> 34 # include <stdlib.h> 35 # include <string.h> 36 int main () 37 { /* Based on a test program from Karl Heuer. */ 38 char *line = NULL; 39 size_t siz = 0; 40 int len; 41 FILE *in = fopen ("./conftest.data", "r"); 42 if (!in) 43 return 1; 44 len = getline (&line, &siz, in); 45 exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1); 46 } 47 ], am_cv_func_working_getline=yes dnl The library version works. 48 , am_cv_func_working_getline=no dnl The library version does NOT work. 49 , dnl We're cross compiling. Assume it works on glibc2 systems. 50 [AC_EGREP_CPP([Lucky GNU user], 51 [ 52 #include <features.h> 53 #ifdef __GNU_LIBRARY__ 54 #if (__GLIBC__ >= 2) 55 Lucky GNU user 56 #endif 57 #endif 58 ], 59 [am_cv_func_working_getline=yes], 60 [am_cv_func_working_getline=no])] 61 )]) 62 fi 63 64 if test $ac_cv_have_decl_getline = no; then 65 HAVE_DECL_GETLINE=0 66 fi 67 68 if test $am_cv_func_working_getline = no; then 69 REPLACE_GETLINE=1 70 AC_LIBOBJ([getline]) 71 72 gl_PREREQ_GETLINE 73 fi 74 ]) 75 76 # Prerequisites of lib/getline.c. 77 AC_DEFUN([gl_PREREQ_GETLINE], 78 [ 79 gl_FUNC_GETDELIM 80 ]) 81
