| From: | Michael Loftis <mloftis(at)wgops(dot)com> |
|---|---|
| To: | Thomas Lockhart <thomas(at)fourpalms(dot)org> |
| Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers List <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Patches applied; initdb time! |
| Date: | 2002-04-21 22:52:23 |
| Message-ID: | 3CC342A7.5010403@wgops.com |
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| Lists: | pgsql-bugs pgsql-hackers |
Thomas Lockhart wrote:
>>>But I do override some parameters in my Makefile.custom:
>>>CFLAGS+= -g -O0 -DUSE_ASSERT_CHECKING
>>>
>>If you use -O0 then you miss most of the interesting warnings.
>>
>
>?? Not in this case. afaik -O0 suppresses most optimizations (and hence
>does not reorder instructions, which is why I use it for debugging; I
>know, debuggers nowadays work pretty well even with instruction
>reordering, but...).
>
>Anyway, compiling with "-O2" on variable.c still does not show the
>warnings with my 2.96.x compiler...
>
It's actually the optimiser that allows a large number of the warnings
to be uncovered. It generates extra code-path and coverage information,
as well as other things, that are needed for the guts of GCC to squawk
about a number of odd behaviours.
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