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Re: What is a regression?

From: Jason Merrill <jason at redhat dot com>
To: skaller <skaller at users dot sourceforge dot net>
Cc: GCC <gcc at gcc dot gnu dot org>, Mark Mitchell <mark at codesourcery dot com>
Date: Tue, 23 Oct 2007 00:00:42 -0400
Subject: Re: What is a regression?
References: <471CFD3A.4060407@redhat.com> <1193107079.6786.29.camel@rosella.wigram>

skaller wrote:

But Jason, the compiler worked properly in rejecting invalid syntax.
Now you're suggesting it fails to do so.  This suggests a real regression
and a real bug: the new feature should have an enabling flag
that couldn't have been set before it was implemented, and without
that flag should create the same error in the current version.

The current version gives an error "ISO C++ does not include variadic templates" unless you enable C++0x mode. And then crashes.

But in any case, nobody has code that relies on getting an error from a previous version of the compiler that would be broken by moving to 4.3. Only regressions on valid code seem serious enough to me to warrant blocking a release.

BTW: did WG21 already pass this proposal?

Yes, a few meetings back.

Jason

Follow-Ups:
- Re: What is a regression?
  - From: skaller
- Re: What is a regression?
  - From: Gabriel Dos Reis

References:
- What is a regression?
  - From: Jason Merrill
- Re: What is a regression?
  - From: skaller

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