Date: Thu, 4 Sep 2003 11:28:58 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: netchild@freebsd.org Cc: current@freebsd.org Subject: Re: Question about genassym, locore.s and 0-sized arrays (showstopper for an icc compiled kernel) Message-ID: <20030904162858.GI98381@dan.emsphone.com> In-Reply-To: <20030904180448.021a1b6b.Alexander@Leidinger.net> References: <20030904180448.021a1b6b.Alexander@Leidinger.net>
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In the last episode (Sep 04), Alexander Leidinger said: > At the moment I discussing an issue with Intel regarding 0-sized > arrays. gcc seems to be violating the standard and produces code with > an array size of "0", whereas icc produces code where an 0-sized > array has the size "1". This results in different nm output of > genassym.o: [snip] > - If we depend on it: how hard would it be to rewrite it to not depend > on 0-sized arrays (and does someone volunteer to rewrite it)? It > would be nice if someone could point me to the source if it isn't > an easy task, my contact @Intel is willing to convince the > developers to change icc, but he has to "present a persuasive > argument to development to pursue a solution". If you're talking FreeBSD 5, you should be able to simply subsitute a C99 "flexible array member" (basically replace "[0]" with "[]") and get the same effect. 0-length arrays are a gcc extension: http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html Under FreeBSD 4.x, you can't use them because gcc 2.95 only supports the gcc extension. Intel has added support for a lot of gcc extensions recently; they may be willing to add this to the list. -- Dan Nelson dnelson@allantgroup.com
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