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From: "Martin Storsjö" <martin@martin.st>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] ffbuild: use response files only if ar accepts them
Date: Tue, 18 Mar 2025 11:57:15 +0200 (EET)
Message-ID: <6e8dd136-549a-d2fd-db67-7b11f93d6eb@martin.st> (raw)
In-Reply-To: <34ad06cb-4e8c-42bc-89bb-d3013d7e0cdd@gyani.pro>

On Mon, 17 Mar 2025, Gyan Doshi wrote:

>
>
> On 2025-03-17 09:44 pm, Zhao Zhili wrote:
>> 
>>> On Mar 17, 2025, at 23:16, Gyan Doshi <ffmpeg@gyani.pro> wrote:
>>> 
>>> This is to not break linking with toolchains that don't support reading
>>> args from a 'response file'.
>>> ---
>>> I've assumed that ld on a system will have same support as ar.
>>> 
>>> configure           | 7 +++++++
>>> ffbuild/library.mak | 8 ++++++++
>>> 2 files changed, 15 insertions(+)
>>> 
>>> diff --git a/configure b/configure
>>> index f6964c4ee1..d84e32196d 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -5230,6 +5230,12 @@ else
>>>      ar_o='$@'
>>> fi
>>> 
>>> +if $ar 2>&1 | grep -qi  "@.*file"; then
>>> +    ar_objs="true"
>>> +else
>>> +    ar_objs=""
>>> +fi
>> Works for me.
>
> Good. Let's wait for another report.

This unbreaks the build for me on macOS too.

As this change did break a fairly major platform, I don't think we should 
wait too long to either revert the change, or push the fix.

As for the fix - I generally find it more robust to actually _try_ doing 
the requested thing (use a response file), than to look for specific 
strings in help output.

I see that the regex, "@.*file", should be matched by both GNU ar and 
llvm-ar, so that's good. But e.g. MS lib.exe also supports response files, 
and it doesn't include this pattern in the output. Also MS lib.exe would 
certainly be a case where we'd want to use response files to overcome the 
command line length limit.

So TL;DR, please push this to unbreak platforms like macOS and BSD, or 
revert the original change. But I don't find the test entirely ideal.

// Martin

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  reply	other threads:[~2025-03-18  9:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-17 15:16 Gyan Doshi
2025-03-17 16:14 ` Zhao Zhili
2025-03-17 17:30   ` Gyan Doshi
2025-03-18  9:57     ` Martin Storsjö [this message]
2025-03-18 10:04       ` Gyan Doshi
2025-03-18 10:06         ` Gyan Doshi

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