Re: Speed up clean meson builds by ~25%

On 2024-04-17 23:10:53 -0400, Tom Lane wrote:
> Jelte Fennema-Nio <postgres@jeltef.nl> writes:
> > As I expected this problem was indeed fairly easy to address by still
> > building "backend/parser" before "interfaces". See attached patch.
> 
> I think we should hold off on this.  I found a simpler way to address
> ecpg's problem than what I sketched upthread.  I have a not-ready-to-
> show-yet patch that allows the vast majority of ecpg's grammar
> productions to use the default semantic action.  Testing on my M1
> Macbook with clang 16.0.6 from MacPorts, I see the compile time for
> preproc.o in HEAD as about 1m44 sec; but with this patch, 0.6 sec.

That's pretty amazing.