Re: JIT compiling with LLVM v9.1

On Sunday, February 4, 2018 12:45:50 AM CET Andreas Karlsson wrote:
> On 02/02/2018 10:48 AM, Pierre Ducroquet wrote:
> > I have successfully built the JIT branch against LLVM 4.0.1 on Debian
> > testing. This is not enough for Debian stable (LLVM 3.9 is the latest
> > available there), but it's a first step.
> > I've split the patch in four files. The first three fix the build issues,
> > the last one fixes a runtime issue.
> > I think they are small enough to not be a burden for you in your
> > developments. But if you don't want to carry these ifdefs right now, I
> > maintain them in a branch on a personal git and rebase as frequently as I
> > can.
>
> I tested these patches and while the code built for me and passed the
> test suite on Debian testing I have a weird bug where the very first
> query fails to JIT while the rest work as they should. I think I need to
> dig into LLVM's codebase to see what it is, but can you reproduce this
> bug at your machine?
>
> Code to reproduce:
>
> SET jit_expressions = true;
> SET jit_above_cost = 0;
> SELECT 1;
> SELECT 1;
>
> Output:
>
> postgres=# SELECT 1;
> ERROR: failed to jit module
> postgres=# SELECT 1;
> ?column?
> ----------
> 1
> (1 row)
>
> Config:
>
> Version: You patches applied on top of
> 302b7a284d30fb0e00eb5f0163aa933d4d9bea10
> OS: Debian testing
> llvm/clang: 4.0.1-8
>
> Andreas

Hi

Indeed, thanks for reporting this. I scripted the testing but failed to see
it, I forgot to set on_error_stop.
I will look into this and fix it.

Thanks

Pierre