On 2023-11-28 Tu 21:10, Andres Freund wrote:
> Hi,
>
> On 2023-11-28 20:58:41 -0500, Andrew Dunstan wrote:
>> On 2023-11-28 Tu 19:32, Tom Lane wrote:
>>> Andrew Dunstan <andrew@dunslane.net> writes:
>>> So I'm now a bit baffled. Can you provide more color on what
>>> your test setup is?
>>
>> *sigh* yes, you're right. I inadvertently used a setup that used meson for
>> building REL16_STABLE and HEAD. When I switch it to autoconf I get results
>> that are similar to the earlier branches:
>>
>>
>> ==== REL_16_STABLE ====
>> Time: 3401.625 ms (00:03.402)
>> ==== HEAD ====
>> Time: 3419.088 ms (00:03.419)
>>
>>
>> It's not clear to me why that should be. I didn't have assertions enabled
>> anywhere. It's the same version of bison, same compiler throughout. Maybe
>> meson sets a higher level of optimization? It shouldn't really matter, ISTM.
> Is it possible that you have CFLAGS set in your environment? For reasons that
> I find very debatable, configure.ac only adds -O2 when CFLAGS is not set:
>
> # C[XX]FLAGS are selected so:
> # If the user specifies something in the environment, that is used.
> # else: If the template file set something, that is used.
> # else: If coverage was enabled, don't set anything.
> # else: If the compiler is GCC, then we use -O2.
> # else: If the compiler is something else, then we use -O, unless debugging.
>
> if test "$ac_env_CFLAGS_set" = set; then
> CFLAGS=$ac_env_CFLAGS_value
> elif test "${CFLAGS+set}" = set; then
> : # (keep what template set)
> elif test "$enable_coverage" = yes; then
> : # no optimization by default
> elif test "$GCC" = yes; then
> CFLAGS="-O2"
> else
> # if the user selected debug mode, don't use -O
> if test "$enable_debug" != yes; then
> CFLAGS="-O"
> fi
> fi
>
> So if you have CFLAGS set in the environment, we'll not add -O2 to the
> compilation flags.
>
> I'd check what the actual flags are when building a some .o.
>
I do have a CFLAGS setting, but for meson I used '-Ddebug=true' and no
buildtype or optimization setting. However, I see that in meson.build
we're defaulting to "buildtype=debugoptimized" as opposed to the
standard meson "buildtype=debug", so I guess that accounts for it.
Still getting used to this stuff.
cheers
andrew
--
Andrew Dunstan
EDB: https://www.enterprisedb.com