[svn.haxx.se] · SVN Dev · SVN Users · SVN Org · TSVN Dev · TSVN Users · Subclipse Dev · Subclipse Users · this month's index

Re: [patch] c99-isms

From: C. Michael Pilato <cmpilato_at_collab.net>
Date: Thu, 26 Mar 2009 12:20:43 -0400

Matthew Woehlke wrote:
> I'm trying to build svn 1.6.0 (and previously 1.5.6, which had the same
> problems) on one-and-a-half* machines that lack a c99 compiler. This
> causes problems because svn uses a c99 convention of initializing
> structs with "non-static" data.
>
> The attached patch is needed for compilation to succeed on these
> platforms. Generally speaking, these problems are:
> - struct initialization with "non-const" data
> - comma after last item in an enum
> - initialize function pointers to NULL (use '0' instead)

Now, you do realize that we only aspire to C89/ANSI-C, right? This is
documented in our www/hacking.html file. So, some of what you recommend is
fine because it satisfies both C89 and C99. But some of it, methinks, won't
pan out well for C89 compilers, namely stuff like this:

> diff -ru subversion-1.6.0/subversion/tests/libsvn_client/client-test.c subversion-1.6.0-patched/subversion/tests/libsvn_client/client-test.c
> --- subversion-1.6.0/subversion/tests/libsvn_client/client-test.c 2008-07-30 08:05:17.000000000 -0700
> +++ subversion-1.6.0-patched/subversion/tests/libsvn_client/client-test.c 2009-03-25 14:57:04.536775000 -0700
> @@ -146,7 +146,10 @@
> apr_array_header_t *targets;
> apr_getopt_t *os;
> const int argc = 2;
> - const char *argv[] = { "opt-test", input, NULL };
> + const char *argv[3];
> + argv[0] = "opt-test";
> + argv[1] = input;
> + argv[2] = NULL;
> apr_status_t apr_err;
> svn_error_t *err;

Cases like this will (I'm guessing) cause problems because they declare
stack variables after other assignments have been made. We need to move
those "argv[N] =" lines to after all the variable declarations. Wanna take
another cut at the patch?

-- 
C. Michael Pilato <cmpilato_at_collab.net>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand
------------------------------------------------------
http://subversion.tigris.org/ds/viewMessage.do?dsForumId=462&dsMessageId=1431938

Received on 2009-03-26 17:21:03 CET

This is an archived mail posted to the Subversion Dev mailing list.