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List:       gentoo-dev
Subject:    Re: [gentoo-dev] [PATCH 1/3] multiprocessing.eclass: search also GNUMAKEFLAGS for --load-average
From:       Florian Schmaus <flow () gentoo ! org>
Date:       2023-07-31 10:50:20
Message-ID: b0ea349d-e281-0895-cc5f-052a953ea257 () gentoo ! org
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On 31/07/2023 11.31, Sam James wrote:
> Florian Schmaus <flow@gentoo.org> writes:
>> [[PGP Signed Part:Undecided]]
>> On 25/07/2023 10.32, Michał Górny wrote:
>>> On Tue, 2023-07-25 at 08:26 +0200, Florian Schmaus wrote:
>>>> On 25/07/2023 06.50, Michał Górny wrote:
>>>>> On Mon, 2023-07-24 at 20:57 +0200, Florian Schmaus wrote:
>>>>>> Since --load-average may not be found in other Make implementations
>>>>>> besides GNU MAKE, it is potentially found in GNUMAKEFLAGS and not in
>>>>>> MAKEOPTS.
>>>>>>
>>>>>> Signed-off-by: Florian Schmaus <flow@gentoo.org>
>>>>>> ---
>>>>>>     eclass/multiprocessing.eclass | 6 +++---
>>>>>>     1 file changed, 3 insertions(+), 3 deletions(-)
>>>>>>
>>>>>> diff --git a/eclass/multiprocessing.eclass b/eclass/multiprocessing.eclass
>>>>>> index e55be636a02c..6489ecbb44a6 100644
>>>>>> --- a/eclass/multiprocessing.eclass
>>>>>> +++ b/eclass/multiprocessing.eclass
>>>>>> @@ -1,4 +1,4 @@
>>>>>> -# Copyright 1999-2022 Gentoo Authors
>>>>>> +# Copyright 1999-2023 Gentoo Authors
>>>>>>     # Distributed under the terms of the GNU General Public License v2
>>>>>>        # @ECLASS: multiprocessing.eclass
>>>>>> @@ -86,7 +86,7 @@ makeopts_jobs() {
>>>>>>     # @FUNCTION: makeopts_loadavg
>>>>>>     # @USAGE: [${MAKEOPTS}] [${inf:-999}]
>>>>>>     # @DESCRIPTION:
>>>>>> -# Searches the arguments (defaults to ${MAKEOPTS}) and extracts the value set
>>>>>> +# Searches the arguments (defaults to ${MAKEOPTS} ${GNUMAKEFLAGS}) and extracts the value set
>>>>>>     # for load-average. For make and ninja based builds this will mean new jobs are
>>>>>>     # not only limited by the jobs-value, but also by the current load - which might
>>>>>>     # get excessive due to I/O and not just due to CPU load.
>>>>>> @@ -95,7 +95,7 @@ makeopts_jobs() {
>>>>>>     # If no limit is specified or --load-average is used without a number, ${inf}
>>>>>>     # (defaults to 999) is returned.
>>>>>>     makeopts_loadavg() {
>>>>>> -	[[ $# -eq 0 ]] && set -- "${MAKEOPTS}"
>>>>>> +	[[ $# -eq 0 ]] && set -- "${MAKEOPTS} ${GNUMAKEFLAGS}"
>>>>>>     	# This assumes the first .* will be more greedy than the second .*
>>>>>>     	# since POSIX doesn't specify a non-greedy match (i.e. ".*?").
>>>>>>     	local lavg=$(echo " $* " | sed -r -n \
>>>>>
>>>>> I'm pretty sure [GNU]MAKEFLAGS has incompatible format, in particular it
>>>>> makes hyphens optional.
>>>>
>>>> Yes, hyphens are optional in GNUMAKEFLAGS.
>>>>
>>>> However, makeopts_loadavg() would still be able to extract the
>>>> hyphen-prefixed short (-l) and long (--load-average) options from
>>>> GNUMAKEFLAGS. Hence having makeopts_loadavg() also inspect GNUMAKEFLAGS
>>>> seems like an improvement over the current situation.
>>>>
>>> Also, shouldn't you handle MAKEFLAGS then as well?  If we're to
>>> support
>>> arbitrary variables used by build systems.
>>
>> We could.
>>
>> But GNUMAKEFLAGS was not arbitrary chosen. The idea is that portage
>> may set --load-average via GNUMAKEFLAGS if the user did not set
>> MAKEOPTS and GNUMAKEFLAGS.
>>
>> See https://github.com/gentoo/portage/pull/1072
>>
>> I first put --load-average into MAKEOPTS, but --load-average is not a
>> portable make option, that is, some Make implementation do not support
>> it. Adding it to GNUMAKEFLAGS, a variable already set by portage, we
>> avoid passing this option to a make implementation that does not
>> support it.
>>
>> Hence, just adding GNUMAKEFLAGS is sufficient for the purpose of
>> propagating portage's potential new default into
>> multiprocessing.eclass & Co.
> 
> But this exposed a problem in that we're missing other variables
> that make recognises, so we need to handle the other case too.

Sure, which one do you have in mind?

- Flow

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