Re: [PATCH] Ignore boilerplate logo from MSVC on stderr.

[Peter Rosin]

Den 2010-08-16 21:41 skrev Peter Rosin:
> Den 2010-08-16 21:36 skrev Eric Blake:
>> On 08/16/2010 01:26 PM, Peter Rosin wrote:
>>> Good catch, I knew they were very similar and assumed my matching was just
>>> about wide enough. But since I didn't check, Murphy made sure that it wasn't
>>> working for everybody, see below...
>>
>> Rather than doing a sed for a particular regex, I would be much more
>> comfortable with a comparison of the two outputs.  Less chance of
>> Microsoft changing their output in such a way that would foil yet
>> another regex.
> 
> Yes, cmp would be nicer. But the current autoconf code is not at all
> rigged for doing that easily. It's way beyond me anyway, and I dare not
> attempt such an overhaul...

I looked a bit further, and found that there are other tests that
will also choke on the logo on stderr.

AC_PATH_XTRA has no chance of succeeding as it has
        ac_[]_AC_LANG_ABBREV[]_werror_flag=yes
before testing and never even tries with the flag cleared.

Not that I'd think AC_PATH_XTRA would have much success on MSVC anyway,
but more instances of *_werror_flag=yes are bound to creep in. Heck,
there's even a published macro for setting it, who knows what 3rd party
code might do with it turned on?

So, a cmp on stderr in the -g test will not solve all issues with the
boilerplate logo on stderr, but my patch will. That is, if you ignore
that it's a bit over on the fragile end of the scale and might need
adjustment in the future. On the other hand, someone probably thought
the current -g test was pretty solid at some point and it still needed
adjustment...

Cheers,
Peter