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Re: Request for help: slashem

Hi Nilesh,

TLDR: sudo apt remove qemu-user qemu-user-static

Quoting Nilesh Patra (2021-03-16 22:20:45)
> However, there are several of: ERROR: ld.so: object 'libfakeroot-sysv.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
> 
> Not sure if it is okay, probably it is not.

It is not. What you are seeing is the combination of using LD_PRELOAD via
fakeroot with qemu-user via binfmt-misc. The error happens because when you run
a foreign architecture binary on a system that can emulate that foreign
architecture with qemu-user transparently with binfmt-misc under fakeroot, then
foreign architecture shared libraries like libfakeroot-sysv.so will likely not
be available. Foreign architecture LD_PRELOAD with fakeroot or fakechroot is
possible but requires a number of hacks:

https://sources.debian.org/src/mmdebstrap/0.7.5-2/mmdebstrap/#L2549

But when cross building you do not want to run foreign architecture binaries.
It just happens to work on systems that use qemu-user and binfmt-misc and will
of course only work for architectures with qemu support. The easiest way to
find these problems is to build on a system that doesn't have qemu-user
installed, hence my TLDR suggestion from above.

If you remove them, then the build will fail very early:

    make[4]: Entering directory '/<<PKGBUILDDIR>>/util'
    ./makedefs -m
    ./makedefs: 1: Syntax error: word unexpected (expecting ")")
    make[4]: *** [Makefile:199: ../src/monstr.c] Error 2
    make[4]: Leaving directory '/<<PKGBUILDDIR>>/util'
    make[3]: *** [Makefile:658: monstr.c] Error 2
    make[3]: Leaving directory '/<<PKGBUILDDIR>>/src'
    make[2]: *** [Makefile:212: ../include/date.h] Error 2
    make[2]: Leaving directory '/<<PKGBUILDDIR>>/util'
    dh_auto_build: error: cd util && make -j1 "INSTALL=install --strip-program=true" PKG_CONFIG=aarch64-linux-        gnu-pkg-config CXX=aarch64-linux-gnu-g\+\+ CC=aarch64-linux-gnu-gcc recover returned exit code 2
    make[1]: *** [debian/rules:26: override_dh_auto_build] Error 25
    make[1]: Leaving directory '/<<PKGBUILDDIR>>'
    make: *** [debian/rules:6: build] Error 2
    dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2

This will be tricky to fix, because essentially you have to to adapt the
upstream build system such that all utilities that are not installed but run
during the build are compiled for the build architecture and not for the host
architecture. If there are utilities that are not only used during the build
but also installed, then they need to be compiled twice: once native and once
cross.

Thanks!

cheers, josch

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