1# strtok_r.m4 serial 16 2dnl Copyright (C) 2002-2004, 2006-2007, 2009-2021 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_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