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Re: Fix an 8-year-old AC_REQUIRE bug

From: Paolo Bonzini
Subject: Re: Fix an 8-year-old AC_REQUIRE bug
Date: Wed, 31 Dec 2008 10:10:52 +0100
User-agent: Thunderbird (Macintosh/20081105)

Eric Blake wrote:
> Eric Blake <ebb9 <at>> writes:
>> Here's my first draft of a patch.  Unfortunately, there is probably existing 
>> code that was expecting the old buggy behavior.
> And here's my proposed patch that fixes those, by introducing a new macro 
> that 
> states when we want the old behavior (AS_IF, AS_CACHE_VAL, and maybe a small 
> handful of other places) instead of the new.  As a bonus, wrapping text in 
> AC_REQUIRE_HOIST issues a warning on code that was previously triggering the 
> buggy AC_REQUIRE behaivior.

IMHO, this can wait for 2.65... we changed enough m4sugar internals in
2.64, and all of them were in a backwards-compatible way.  If we stick
to that policy, understanding regressions will be much easier.


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