bug#69314: [PATCH] Speed up stage0 bootstrap build using prebuilts

[Ludovic Courtès]

Hi Jonas,

Jonas Hahnfeld <hah...@hahnjo.de> skribis:

> On Thu, 2024-01-04 at 11:57 +0100, Jonas Hahnfeld wrote:
>> From 95f15821c535537c7ad4fdae1988855314d56ece Mon Sep 17 00:00:00 2001
>> From: Jonas Hahnfeld <hah...@hahnjo.de>
>> Date: Thu, 4 Jan 2024 11:44:55 +0100
>> Subject: [PATCH] Speed up stage0 bootstrap build using prebuilts
>> 
>> Use prebuilt bytecode of ice-9/eval.go and others for all of stage0,
>> it is optimized and evaluation is much faster. In my environment,
>> this speeds up the build of guile-3.0.9 from around 29 minutes to
>> only 19 minutes.
>> 
>> * meta/build-env.in: In stage0, prefer prebuilt bytecode over just
>> compiled stage0 files.
>> ---
>>  meta/build-env.in | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/meta/build-env.in b/meta/build-env.in
>> index bdc88ded4..446a536af 100644
>> --- a/meta/build-env.in
>> +++ b/meta/build-env.in
>> @@ -58,7 +58,7 @@ then
>>      fi
>>      export GUILE_LOAD_PATH
>>      case "$GUILE_BOOTSTRAP_STAGE" in
>> -        stage0) 
>> GUILE_LOAD_COMPILED_PATH="${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?

Thanks for the patch!

Ludo’.