+dnl Checks for buggy strtok_r.
+dnl
+dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
+dnl with optimization that can cause segfaults:
+dnl
+dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
+AC_DEFUN([OVS_CHECK_STRTOK_R],
+ [AC_CACHE_CHECK(
+ [whether strtok_r macro segfaults on some inputs],
+ [ovs_cv_strtok_r_bug],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([#include <stdio.h>
+ #include <string.h>
+ ],
+ [[char string[] = ":::";
+ char *save_ptr = (char *) 0xc0ffee;
+ char *token1, *token2;
+ token1 = strtok_r(string, ":", &save_ptr);
+ token2 = strtok_r(NULL, ":", &save_ptr);
+ freopen ("/dev/null", "w", stdout);
+ printf ("%s %s\n", token1, token2);
+ return 0;
+ ]])],
+ [ovs_cv_strtok_r_bug=no],
+ [ovs_cv_strtok_r_bug=yes],
+ [ovs_cv_strtok_r_bug=yes])])
+ if test $ovs_cv_strtok_r_bug = yes; then
+ AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
+ [Define if strtok_r macro segfaults on some inputs])
+ fi
+])
+