Bug#996953: perl: make -j72 failing with a text file busy error

[Niko Tyni]

Control: tag -1 patch confirmed

On Wed, Feb 16, 2022 at 12:57:11PM +0100, gyptazy at gyptazy.ch wrote:
 
> I can confirm this issue when rebuilding Perl on powerful systems. Multiple builds of ‚generate_uudmap.o‘ are
> created during the compile time and at some point it fails with:
> 
>     make -j88 […]
>     ./generate_uudmap uudmap.h bitcount.h mg_data.h
>     6584make[3]: ./generate_uudmap: Text file busy
>     6585make[3]: *** [Makefile:329: bitcount.h] Error 127
> 
> As a result, I patched the ‚rules‘ file to run ‚dh_auto_build‘ with ‚--no-parallel‘ option.

Thanks.

This seems to be a build system corner case that only happens when the
Configure run is split in two with -E and -S, which we do for the benefit
of cross builds.

I think it can be fixed by injecting a 'make depend' call at the end of
debian/config.debian, mimicking what Configure does when run "normally"
with -e. That would be preferrable to the dh --no-parallel workaround
as it would not slow the builds.

Could you please try if the attached patch fixes it?
-- 
Niko Tyni   ntyni at debian.org
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