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