1# strtok_r.m4 serial 15
2dnl Copyright (C) 2002-2004, 2006-2007, 2009-2020 Free Software Foundation,
3dnl Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8AC_DEFUN([gl_FUNC_STRTOK_R],
9[
10  dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'.
11  AC_REQUIRE([AC_C_RESTRICT])
12
13  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
14  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
15  AC_CHECK_FUNCS([strtok_r])
16  if test $ac_cv_func_strtok_r = yes; then
17    HAVE_STRTOK_R=1
18    dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault
19    dnl when the second argument to strtok_r is a constant string that has
20    dnl exactly one byte and compiling with optimization.  This bug is, for
21    dnl example, present in the glibc 2.7-18 package in Debian "lenny".
22    dnl See <https://sourceware.org/bugzilla/show_bug.cgi?id=5614>.
23    AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],
24      [AC_RUN_IFELSE(
25         [AC_LANG_PROGRAM([[
26              #ifndef __OPTIMIZE__
27              # define __OPTIMIZE__ 1
28              #endif
29              #undef __OPTIMIZE_SIZE__
30              #undef __NO_INLINE__
31              #include <stdlib.h>
32              #include <string.h>
33            ]],
34            [[static const char dummy[] = "\177\01a";
35              char delimiters[] = "xxxxxxxx";
36              char *save_ptr = (char *) dummy;
37              strtok_r (delimiters, "x", &save_ptr);
38              strtok_r (NULL, "x", &save_ptr);
39              return 0;
40            ]])
41         ],
42         [gl_cv_func_strtok_r_works=yes],
43         [gl_cv_func_strtok_r_works=no],
44         [case "$host_os" in
45                           # Guess no on glibc systems.
46            *-gnu* | gnu*) gl_cv_func_strtok_r_works="guessing no" ;;
47                           # Guess yes on native Windows.
48            mingw*)        gl_cv_func_strtok_r_works="guessing yes" ;;
49            *)             gl_cv_func_strtok_r_works="guessing yes" ;;
50          esac
51         ])
52      ])
53    case "$gl_cv_func_strtok_r_works" in
54      *no)
55        dnl We could set REPLACE_STRTOK_R=1 here, but it's only the macro
56        dnl version in <bits/string2.h> which is wrong. The code compiled
57        dnl into libc is fine.
58        UNDEFINE_STRTOK_R=1
59        ;;
60    esac
61  else
62    HAVE_STRTOK_R=0
63  fi
64  AC_CHECK_DECLS_ONCE([strtok_r])
65  if test $ac_cv_have_decl_strtok_r = no; then
66    HAVE_DECL_STRTOK_R=0
67  fi
68])
69
70# Prerequisites of lib/strtok_r.c.
71AC_DEFUN([gl_PREREQ_STRTOK_R], [
72  :
73])
74