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# strtok_r.m4 serial 15
dnl Copyright (C) 2002-2004, 2006-2007, 2009-2020 Free Software Foundation,
dnl Inc.
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_DEFUN([gl_FUNC_STRTOK_R],
[
dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'.
AC_REQUIRE([AC_C_RESTRICT])
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS([strtok_r])
if test $ac_cv_func_strtok_r = yes; then
HAVE_STRTOK_R=1
dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault
dnl when the second argument to strtok_r is a constant string that has
dnl exactly one byte and compiling with optimization. This bug is, for
dnl example, present in the glibc 2.7-18 package in Debian "lenny".
dnl See <https://sourceware.org/bugzilla/show_bug.cgi?id=5614>.
AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
#ifndef __OPTIMIZE__
# define __OPTIMIZE__ 1
#endif
#undef __OPTIMIZE_SIZE__
#undef __NO_INLINE__
#include <stdlib.h>
#include <string.h>
]],
[[static const char dummy[] = "\177\01a";
char delimiters[] = "xxxxxxxx";
char *save_ptr = (char *) dummy;
strtok_r (delimiters, "x", &save_ptr);
strtok_r (NULL, "x", &save_ptr);
return 0;
]])
],
[gl_cv_func_strtok_r_works=yes],
[gl_cv_func_strtok_r_works=no],
[case "$host_os" in
# Guess no on glibc systems.
*-gnu* | gnu*) gl_cv_func_strtok_r_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_strtok_r_works="guessing yes" ;;
*) gl_cv_func_strtok_r_works="guessing yes" ;;
esac
])
])
case "$gl_cv_func_strtok_r_works" in
*no)
dnl We could set REPLACE_STRTOK_R=1 here, but it's only the macro
dnl version in <bits/string2.h> which is wrong. The code compiled
dnl into libc is fine.
UNDEFINE_STRTOK_R=1
;;
esac
else
HAVE_STRTOK_R=0
fi
AC_CHECK_DECLS_ONCE([strtok_r])
if test $ac_cv_have_decl_strtok_r = no; then
HAVE_DECL_STRTOK_R=0
fi
])
# Prerequisites of lib/strtok_r.c.
AC_DEFUN([gl_PREREQ_STRTOK_R], [
:
])
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