From: Jeff King <peff@peff.net>
Date: Tue, 20 May 2014 06:21:32 GMT
Subject: Re: [PATCH v2] format-patch --signature-file <file>
Message-ID: <20140520062132.GA5222@sigill.intra.peff.net>
In-Reply-To: <20140520054621.GA28317@hudson.localdomain>

On Mon, May 19, 2014 at 10:46:21PM -0700, Jeremiah Mahler wrote:

> > Avoiding that is easy with an indirection, no?  Something like this
> > at the top:
> > 
> >   static const char *the_default_signature = git_version_string;
> >   static const char *signature = the_default_signature;
> > 
> > and comparing to see if signature points at the same address as
> > the_default_signature would give you what you want, I think.
> 
> I like your suggestion for a default signature variable.
> Unfortunately, C doesn't like it as much.
> 
> static const char *the_default_signature = git_version_string;
> static const char *signature = the_default_signature;  // ERROR
> // initializer element is not constant

You could do:

  #define DEFAULT_SIGNATURE git_version_string
  static const char *signature = DEFAULT_SIGNATURE;

  ...

  if (signature == DEFAULT_SIGNATURE)
     ...

but maybe that is getting a little unwieldy, considering the scope of
the original problem.

-Peff