X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fstrtok_r.m4;h=59ea3d7c92e8102432cd264bec96fb8535b0cef1;hb=91d0cb58387e1e52b7023bcd0b01c1337c0fb9c8;hp=390b7faf477468c4bdcddfb929bc8de3699791bf;hpb=854a5d353795189e727ba52631ec5b5862cbcb8f;p=gnulib.git

diff --git a/m4/strtok_r.m4 b/m4/strtok_r.m4
index 390b7faf4..59ea3d7c9 100644
--- a/m4/strtok_r.m4
+++ b/m4/strtok_r.m4
@@ -1,19 +1,74 @@
-# strtok_r.m4 serial 1
-dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# strtok_r.m4 serial 13
+dnl Copyright (C) 2002-2004, 2006-2007, 2009-2011 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],
 [
-  AC_REPLACE_FUNCS(strtok_r)
-  AC_CHECK_DECLS_ONCE(strtok_r)
-  gl_PREREQ_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 $ac_cv_func_strtok_r = yes; then
+    HAVE_STRTOK_R=1
+    dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault
+    dnl when the second argument to strtok_r is a constant string that has
+    dnl exactly one byte and compiling with optimization.  This bug is, for
+    dnl example, present in the glibc 2.7-18 package in Debian "lenny".
+    dnl See <http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614>.
+    AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],
+      [AC_RUN_IFELSE(
+         [AC_LANG_PROGRAM([[
+              #ifndef __OPTIMIZE__
+              # define __OPTIMIZE__ 1
+              #endif
+              #undef __OPTIMIZE_SIZE__
+              #undef __NO_INLINE__
+              #include <stdlib.h>
+              #include <string.h>
+            ]],
+            [[static const char dummy[] = "\177\01a";
+              char delimiters[] = "xxxxxxxx";
+              char *save_ptr = (char *) dummy;
+              strtok_r (delimiters, "x", &save_ptr);
+              strtok_r (NULL, "x", &save_ptr);
+              return 0;
+            ]])
+         ],
+         [gl_cv_func_strtok_r_works=yes],
+         [gl_cv_func_strtok_r_works=no],
+         [
+changequote(,)dnl
+          case "$host_os" in
+                    # Guess no on glibc systems.
+            *-gnu*) gl_cv_func_strtok_r_works="guessing no";;
+            *)      gl_cv_func_strtok_r_works="guessing yes";;
+          esac
+changequote([,])dnl
+         ])
+      ])
+    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.h and lib/strtok_r.c.
+# Prerequisites of lib/strtok_r.c.
 AC_DEFUN([gl_PREREQ_STRTOK_R], [
-  AC_REQUIRE([gl_C_RESTRICT])
+  :
 ])