Re: [PATCH] Identify LWLocks in tracepoints

Hi,

On 2021-05-10 12:14:46 -0400, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > Looks like it did, but turned out to have some unintended side-effects
> > :(.
> > The snapshot builds are now new:
> > https://buildfarm.postgresql.org/cgi-bin/show_stage_log.pl?nm=flaviventris&dt=2021-05-10%2015%3A43%3A56&stg=configure
> > configure:3966: ccache /usr/lib/gcc-snapshot/bin/gcc --version >&5
> > gcc (Debian 20210421-1) 11.0.1 20210421 (prerelease) [gcc-11 revision fbb7739892e:d13ce34bd01:3756d99dab6a268d0d8a17583980a86f23f0595a]
> > But the aforementioned dependencies that needed to remove broke the
> > installed old versions of gcc/clang.
> > I started to build the old versions of llvm manually, but that then hits
> > the issue that at least 3.9 doesn't build with halfway modern versions
> > of gcc/clang. So I gotta do it stepwise (i.e. go backwards, build llvm
> > n-2 with n-1), will take a bit of time.
> 
> Ugh.  Memo to self: don't rag on other peoples' buildfarm configurations
> right before a release deadline :-(.  Sorry to cause you trouble.

No worries - I knew that I'd have to do this at some point, even though
I hadn't planned to do that today... I should have all of them green
before end of today.

I found that I actually can build LLVM 3.9 directly, as clang-6 can
still build it directly (wheras the oldest gcc still installed can't
build it directly). So it's a bit less painful than I thought at first

The 3.9 instances (phycodurus, dragonet) tests are running right now,
and I'm fairly sure they'll pass (most of a --noreport --nostatus run
passed). Going forward building LLVM 4,5,6 now - the later versions take
longer...

Greetings,

Andres Freund