Re: [dpdk-dev] [PATCH] buildtools: fix build with meson 0.60

[Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>]

2021-10-27 17:16 (UTC+0100), Bruce Richardson:
> On Tue, Oct 26, 2021 at 10:32:39PM +0300, Dmitry Kozlyuk wrote:
> > Meson 0.60 switched the format of uninstalled static libraries
> > to thin archives, that is, they contain only paths to object files,
> > not the files themselves. Files cannot be extracted in this case,
> > resulting in build errors:
> > 
> >     ar: `x' cannot be used on thin archives.
> > 
> > Handle thin archives when invoking pmdinfogen
> > by directly using the files referenced in the archive.
> > 
> > Bugzilla ID: 836
> > Fixes: e6e9730c7066 ("buildtools: support object file extraction for Windows")
> > Cc: stable@dpdk.org
> > 
> > Reported-by: Michal Berger <michallinuxstuff@gmail.com>
> > Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
> > ---
> >  buildtools/gen-pmdinfo-cfile.py | 23 ++++++++++++++---------
> >  1 file changed, 14 insertions(+), 9 deletions(-)
> >  
> 
> Here is an alternative fix that works in my testing, based on my earlier
> suggestion:
> 
> Regards,
> /Bruce
> 
> diff --git a/buildtools/gen-pmdinfo-cfile.py b/buildtools/gen-pmdinfo-cfile.py
> index 58fe3ad152..5fbd51658a 100644
> --- a/buildtools/gen-pmdinfo-cfile.py
> +++ b/buildtools/gen-pmdinfo-cfile.py
> @@ -9,12 +9,13 @@
> 
>  _, tmp_root, ar, archive, output, *pmdinfogen = sys.argv
>  with tempfile.TemporaryDirectory(dir=tmp_root) as temp:
> -    run_ar = lambda command: subprocess.run(
> -        [ar, command, os.path.abspath(archive)],
> -        stdout=subprocess.PIPE, check=True, cwd=temp
> -    )
> -    # Don't use "ar p", because its output is corrupted on Windows.
> -    run_ar("x")
> -    names = run_ar("t").stdout.decode().splitlines()
> -    paths = [os.path.join(temp, name) for name in names]
> +    paths = []
> +    for name in subprocess.run([ar, "t", archive], stdout=subprocess.PIPE,
> +                               check=True).stdout.decode().splitlines():
> +        if os.path.exists(name):
> +            paths.append(name)
> +        else:
> +            subprocess.run([ar, "x", os.path.abspath(archive), name],
> +                           check=True, cwd=temp)
> +            paths.append(os.path.join(temp, name))
>      subprocess.run(pmdinfogen + paths + [output], check=True)
> 

It buys with simplicity.
I hoped to avoid creating temporary directories in vain
when all archives are thin, but maybe it's not that important.