From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, pgsql-hackers(at)postgresql(dot)org, Kris Jurka <books(at)ejurka(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us> |
Subject: | Re: src/tools/pginclude considered harmful (was Re: [PATCHES] |
Date: | 2006-07-14 20:50:09 |
Message-ID: | 4887.1152910209@sss.pgh.pa.us |
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Lists: | pgsql-hackers pgsql-patches |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> On Fri, Jul 14, 2006 at 04:24:59PM -0400, Tom Lane wrote:
>> After some reflection it seems that there is only one case where removal
>> of a needed include file would not lead to a compiler error or warning,
>> assuming gcc with ordinary -W settings (notably -Wmissing-prototypes).
>> That case is exactly what Kris found: removal of a #define that is
>> tested via #ifdef or #if defined(). (Can anyone think of other cases?)
> My off-the-top-of-my-head solution would be a script that would pass
> each file through "gcc -E" (the preprocessor), and compare before and
> after rearrangement. You'd have to ignore the effects of included
> header files, but it would pick up the cases where a block of code that
> was previously included no longer is. Or if a macro is expanded
> differently...
You'd still have to try to compile the code though; AFAICS the above
doesn't catch whether you've removed a typedef or function declaration
that's referenced in the file.
BTW, one of the remaining holes in pgrminclude is that it compiles with
-fsyntax-only, which apparently causes it to fail to detect some errors
of significance --- I assume that's how it managed to foul up lmgr.c,
inet_net_ntop.c, etc.
regards, tom lane
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