minor misleading configure error-msg around PCRE

[Maxim Dounin]

Hello!

On Tue, Oct 29, 2013 at 11:27:48AM +0100, e1c1bac6253dc54a1e89ddc046585792 at posteo.net wrote:

> Hi,
> 
> ./configure: error: the HTTP rewrite module requires the PCRE library.
> You can either disable the module by using
> --without-http_rewrite_module
> option, or install the PCRE library into the system, or build the
> PCRE library
> statically from the source with nginx by using --with-pcre=<path>
> option.
> 
> This happens when not having pcre, using
> --without-http_rewrite_module BUT
> also --with-pcre as an option, like:
> ./configure --without-http_rewrite_module --with-pcre
> 
> For sure that's a stupid combination, but just happened in a very
> long, generated
> configure line here. FWIW, this was on OpenBSD 5.1.

Actually, this is _valid_ configuration.  It will compile nginx 
with PCRE support in various places like location matching, but 
without the rewrite module.

The error message provided is a bit misleading as it refers to a 
module already disabled, but generating proper error messages for 
this and similar non-trivial cases is tricky and was considered to 
be an overkill.

-- 
Maxim Dounin
http://nginx.org/en/donation.html