[Spread-users] Small portability issue in alarm.c

andreas.ames at de.transport.bombardier.com andreas.ames at de.transport.bombardier.com
Mon Oct 29 10:26:56 EDT 2012

Hi all,

I've compiled spread 4.2 with gcc version egcs-2.91.66 19990314/Linux 
(egcs-1.1.2 release) on Redhat 6.1, i.e. glibc 2.1.2 (no, this is not a 
typo ;-).  It compiled just fine with a minor issue concerning the use of 
va_copy in alarm.c.  Googling around a bit I found the following approach 
which should be better portable than just using "va_copy" (according to 
the glibc reference manual and the autoconf manual) and certainly compiles 
on my platform:

--- alarm.c.orig        Mon Oct 29 13:40:12 2012
+++ alarm.c     Mon Oct 29 13:55:38 2012
@@ -191,7 +191,11 @@
-        va_copy(ap_copy, ap);                               /* make a 
copy of param list in case of vsnprintf truncation */
+#ifdef __va_copy                                            /* make a 
copy of param list in case of vsnprintf truncation */
+        __va_copy(ap_copy, ap);
+        memcpy(&ap_copy, &ap, sizeof (va_list));
         msg_len  = vsnprintf(msg_ptr, MAX_ALARM_MESSAGE_BUF - tot_len, 
message, ap);
         tot_len += msg_len;



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