2 dnl Copyright (C) 2002, 2003, 2004, 2007, 2009 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_STRTOK_R],
9 dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'.
10 AC_REQUIRE([AC_C_RESTRICT])
12 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
13 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
14 AC_CHECK_FUNCS([strtok_r])
15 if test $ac_cv_func_strtok_r = yes; then
16 dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault
17 dnl when the second argument to strtok_r is a constant string that has
18 dnl exactly one byte and compiling with optimization. This bug is, for
19 dnl example, present in the glibc 2.7-18 package in Debian "lenny".
20 dnl See <http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614>.
21 AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],
25 # define __OPTIMIZE__ 1
27 #undef __OPTIMIZE_SIZE__
32 [[char delimiters[] = "xxxxxxxx";
33 char *save_ptr = (char *) 0xd0d0;
34 strtok_r (delimiters, "x", &save_ptr);
35 strtok_r (NULL, "x", &save_ptr);
39 [gl_cv_func_strtok_r_works=yes],
40 [gl_cv_func_strtok_r_works=no],
44 # Guess no on glibc systems.
45 *-gnu*) gl_cv_func_strtok_r_works="guessing no";;
46 *) gl_cv_func_strtok_r_works="guessing yes";;
51 case "$gl_cv_func_strtok_r_works" in
53 dnl We could set REPLACE_STRTOK_R=1 and AC_LIBOBJ([strtok_r]) here,
54 dnl but it's only the macro version in <bits/string2.h> which is wrong.
55 dnl The code compiled into libc is fine.
62 AC_CHECK_DECLS_ONCE([strtok_r])
63 if test $ac_cv_have_decl_strtok_r = no; then
69 # Prerequisites of lib/strtok_r.c.
70 AC_DEFUN([gl_PREREQ_STRTOK_R], [