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Re: svn commit: r1182984 - /subversion/trunk/subversion/tests/libsvn_subr/cache-test.c

From: Philip Martin <philip.martin_at_wandisco.com>
Date: Thu, 13 Oct 2011 18:44:44 +0100

Daniel Shahaf <d.s_at_daniel.shahaf.name> writes:

> First of all, I made the same patch yesterday elsewhere.

Another bug :)

> Second of all, the use is #if, not #ifdef, so I believe the macro is
> always defined (to 0 or 1).

The one doesn't follow from the other. In either case the macro could
be zero, non-zero, no value or not defined:

                                     #if #ifdef
#define APR_HAS_THREADS 1 true true
#define APR_HAS_THREADS 0 false true
#define APR_HAS_THREADS true true
<nothing> false false

So not defining APR_HAS_THREADS is a valid way to define no thread
support, but it means you can't use APR_HAS_THREADS directly as a
variable.

It's possible that APR will always ensure that APR_HAS_THREADS is either
0 or 1, but the C language does not.

-- 
uberSVN: Apache Subversion Made Easy
http://www.uberSVN.com
Received on 2011-10-13 19:45:22 CEST

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