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bug#69314: [PATCH] Speed up stage0 bootstrap build using prebuilts
From: |
Simon Tournier |
Subject: |
bug#69314: [PATCH] Speed up stage0 bootstrap build using prebuilts |
Date: |
Tue, 07 May 2024 18:21:01 +0200 |
Hi Ludo,
On lun., 06 mai 2024 at 11:34, Ludovic Courtès <ludo@gnu.org> wrote:
>>> - stage0)
>>> GUILE_LOAD_COMPILED_PATH="${top_builddir}/stage0:${top_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@"
>>> ;;
>>> + stage0)
>>> GUILE_LOAD_COMPILED_PATH="${top_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@:${top_builddir}/stage0"
>>> ;;
>
> I don’t understand why changing the order would make a difference.
> Surely if .go files are available under prebuilt/, they’ll be found,
> even if that directory comes second? Or am I missing something?
Well, depending on what had been built before, it might read:
--8<---------------cut here---------------start------------->8---
$ ls -1
{stage0,prebuilt/x86_64-unknown-linux-gnu}/ice-9/{boot-9,eval,psyntax-pp}.go
prebuilt/x86_64-unknown-linux-gnu/ice-9/boot-9.go
prebuilt/x86_64-unknown-linux-gnu/ice-9/eval.go
prebuilt/x86_64-unknown-linux-gnu/ice-9/psyntax-pp.go
stage0/ice-9/boot-9.go
stage0/ice-9/eval.go
stage0/ice-9/psyntax-pp.go
--8<---------------cut here---------------end--------------->8---
Therefore, the order in GUILE_LOAD_COMPILED_PATH matters, no?
Somehow, similarly as:
stage1)
GUILE_LOAD_COMPILED_PATH="${top_builddir}/stage1:${top_builddir}/stage0" ;;
I would set the expected most optimized first, such that:
stage0)
GUILE_LOAD_COMPILED_PATH="${top_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@:${top_builddir}/stage0"
;;
assuming ’prebuilt’ provides something more optimized than ’stage0’.
Cheers,
simon