* The MoreBacktrace code supplied by Apple doesn't work on 64 bit Intel

builds, so disable it there
  * On 10.4.8 (and possibly others), siginfo is NULL in the signal
    callback on 64 bit Intel builds, so account for that in the signal
    callback.

This commit was SVN r14045.

opal/mca/backtrace/darwin/configure.m4

@@ -32,6 +32,13 @@ AC_DEFUN([MCA_backtrace_darwin_CONFIG],[
                    [backtrace_darwin_happy="yes"],
                    [backtrace_darwin_happy="no"])
 
+    case "${host}" in
+    i?86-*|x86_64*)
+        if test "$ac_cv_sizeof_long" = "8" ; then
+            backtrace_darwin_happy="no"
+        fi
+    esac
+
     if test "$backtrace_darwin_happy" = "yes" ; then 
        if test "$OMPI_C_GCC_INLINE_ASSEMBLY" = "0" ; then
            backtrace_darwin_happy="no"

opal/util/stacktrace.c

@@ -101,6 +101,7 @@ static void opal_show_stackframe (int signo, siginfo_t * info, void * p)
     size -= ret;
     tmp += ret;
 
+    if (NULL != info) {
         switch (signo)
         {
         case SIGILL:
@@ -290,7 +291,8 @@ static void opal_show_stackframe (int signo, siginfo_t * info, void * p)
             tmp += ret;
             break;
         }
-    case SIGCHLD: {
+        case SIGCHLD: 
+        {
             ret = snprintf(tmp, size, HOSTFORMAT "Sending PID: %d, Sending UID: %d, Status: %d\n",
                            stacktrace_hostname, getpid(), 
                            info->si_pid, info->si_uid, info->si_status);
@@ -299,7 +301,8 @@ static void opal_show_stackframe (int signo, siginfo_t * info, void * p)
             break;
         }
 #ifdef SIGPOLL
-    case SIGPOLL: {
+        case SIGPOLL:
+        {
 #ifdef HAVE_SIGINFO_T_SI_FD
             ret = snprintf(tmp, size, HOSTFORMAT "Band event: %ld, File Descriptor : %d\n",
                            stacktrace_hostname, getpid(), info->si_band, info->si_fd);
@@ -315,6 +318,13 @@ static void opal_show_stackframe (int signo, siginfo_t * info, void * p)
         }
 #endif
         }
+    } else {
+        ret = snprintf(tmp, size,
+                       HOSTFORMAT "siginfo is NULL, additional information unavailable\n",
+                       stacktrace_hostname, getpid());
+        size -= ret;
+        tmp += ret;
+    }
 
     /* write out the signal information generated above */
     write(fileno(stderr), print_buffer, sizeof(print_buffer)-size);