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From: Tom Lane <[email protected]>
To: Hannu Krosing <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Andrey M. Borodin <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: What is a typical precision of gettimeofday()?
Date: Fri, 21 Jun 2024 16:51:15 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAMT0RQSdKQra6QC4b+eAynpqZ0SYdHDfGBBE7hty33OD9jx7Jg@mail.gmail.com>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<CAMT0RQSdKQra6QC4b+eAynpqZ0SYdHDfGBBE7hty33OD9jx7Jg@mail.gmail.com>

Hannu Krosing <[email protected]> writes:
> This is my current patch which also adds running % and optionally uses
> faster way to count leading zeros, though I did not  see a change from
> that.

I've not read the patch yet, but I did create a CF entry [1]
to get some CI cycles on this.  The cfbot complains [2] about

[19:24:31.951] pg_test_timing.c: In function ‘output’:
[19:24:31.951] pg_test_timing.c:229:11: error: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘int64’ {aka ‘long long int’} [-Werror=format=]
[19:24:31.951]   229 |    printf("%*ld    %*.4f  %*.4f %*lld\n",
[19:24:31.951]       |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[19:24:31.951]   230 |       Max(8, len1), i,
[19:24:31.951]       |                     ~
[19:24:31.951]       |                     |
[19:24:31.951]       |                     int64 {aka long long int}

which seems a bit confused, but anyway you cannot assume that int64 is
a match for "%ld", or "%lld" either.  What we generally do for this
elsewhere is to explicitly cast printf arguments to long long int.

Also there's this on Windows:

[19:23:48.231] ../src/bin/pg_test_timing/pg_test_timing.c(162): warning C4067: unexpected tokens following preprocessor directive - expected a newline

			regards, tom lane

[1] https://commitfest.postgresql.org/48/5066/
[2] http://cfbot.cputube.org/highlights/all.html#5066

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