Re: WIP: Faster Expression Processing and Tuple Deforming (including JIT)

On Tue, Dec 06, 2016 at 12:36:41PM -0800, Andres Freund wrote:
> On 2016-12-06 15:25:44 -0500, Tom Lane wrote:
> > I'm not entirely thrilled with the idea of this being a configure-time
> > decision, because that forces packagers to decide for their entire
> > audience whether it's okay to depend on LLVM.  That would be an untenable
> > position to put e.g. Red Hat's packagers in: either they screw the people
> > who want performance or they screw the people who want security.

There's no security issue.  The dependency is on LLVM libraries, not
LLVM front-ends (e.g., clang(1)).

I don't think there's a real issue as to distros/packagers/OS vendors.
They already have to package LLVM, and they already package LLVM
libraries separately from LLVM front-ends.

> The argument for not install a c compiler seems to be that it makes it
> less convenient to build an executable. I doubt that having a C(++)
> library for code generation is convenient enough to change the picture
> there.

The security argument goes back to the days of the Morris worm, which
depended on having developer tools (specifically in that case, ld(1),
the link-editor).  But JIT via LLVM won't give hackers a way to generate
or link arbitrary object code.

Nico
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