lzma running out of memory on qemu-user (#846564)

Hi,

I'm using qemu-user with a Debian unstable sh4 chroot on a 40-core Xeon machine
and running dpkg-deb fails with the same issue reported in #846564 [1]:

dpkg-deb: building package 'gcc-snapshot' in '../gcc-snapshot_20240922-1+sh4.1_sh4.deb'.
dpkg-deb: building package 'gcc-snapshot-dbgsym' in '../gcc-snapshot-dbgsym_20240922-1+sh4.1_sh4.deb'.
dpkg-deb (subprocess): compressing tar member: lzma error: Cannot allocate memory
dpkg-deb: error: <compress> from tar -cf subprocess returned error exit status 2
dh_builddeb: error: dpkg-deb --root-owner-group --build debian/.debhelper/gcc-snapshot/dbgsym-root .. returned exit code 2
dh_builddeb: error: Aborting due to earlier error

Is there a way to tune lzma such that it reduces memory consumption in this case?

Thanks,
Adrian

> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=846564

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