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# getline.m4 serial 19
dnl Copyright (C) 1998-2003, 2005-2007, 2009 Free Software Foundation, Inc.
dnl
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_PREREQ([2.59])
dnl See if there's a working, system-supplied version of the getline function.
dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
dnl have a function by that name in -linet that doesn't have anything
dnl to do with the function we need.
AC_DEFUN([gl_FUNC_GETLINE],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
dnl Persuade glibc <stdio.h> to declare getline().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS_ONCE([getline])
gl_getline_needs_run_time_check=no
AC_CHECK_FUNC([getline],
dnl Found it in some library. Verify that it works.
gl_getline_needs_run_time_check=yes,
am_cv_func_working_getline=no)
if test $gl_getline_needs_run_time_check = yes; then
AC_CACHE_CHECK([for working getline function], [am_cv_func_working_getline],
[echo fooN |tr -d '\012'|tr N '\012' > conftest.data
AC_TRY_RUN([
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
int main ()
{ /* Based on a test program from Karl Heuer. */
char *line = NULL;
size_t siz = 0;
int len;
FILE *in = fopen ("./conftest.data", "r");
if (!in)
return 1;
len = getline (&line, &siz, in);
exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1);
}
], am_cv_func_working_getline=yes dnl The library version works.
, am_cv_func_working_getline=no dnl The library version does NOT work.
, dnl We're cross compiling. Assume it works on glibc2 systems.
[AC_EGREP_CPP([Lucky GNU user],
[
#include <features.h>
#ifdef __GNU_LIBRARY__
#if (__GLIBC__ >= 2)
Lucky GNU user
#endif
#endif
],
[am_cv_func_working_getline=yes],
[am_cv_func_working_getline=no])]
)])
fi
if test $ac_cv_have_decl_getline = no; then
HAVE_DECL_GETLINE=0
fi
if test $am_cv_func_working_getline = no; then
REPLACE_GETLINE=1
AC_LIBOBJ([getline])
gl_PREREQ_GETLINE
fi
])
# Prerequisites of lib/getline.c.
AC_DEFUN([gl_PREREQ_GETLINE],
[
gl_FUNC_GETDELIM
])
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