Cross compiling ARM on X86 system

[ummeegge <ummeegge@ipfire.org>]

Hi all,

I'm trying to cross-compile IPFire for aarch64 on an HP ProDesk running
Kali Linux. As a first step, I installed qemu-user-static and binfmt-
support to enable ARM binary execution during the build process.

When running sudo ./make.sh --target=aarch64 build, the build proceeds
successfully through stage1 and binutils:

`Full toolchain compilation
stage1                                                                
[        0 ][ DONE ]
binutils (2.45) PASS=1                                                
[     1:36 ][ DONE ]`

However, it fails during the zlib-ng build with the following error:

`zlib-ng-2.2.5.tar.gz checksum OK
====================================== Installing zlib-ng-2.2.5 ...
# Build the regular version
cd /home/ummeegge/development/dev-aarch/ipfire-
2.x/build_aarch64/usr/src/zlib-ng-2.2.5 && mkdir -pv build
mkdir: created directory 'build'
cd /home/ummeegge/development/dev-aarch/ipfire-
2.x/build_aarch64/usr/src/zlib-ng-2.2.5/build && ../configure \
				--prefix=/tools_aarch64
Checking for compiler... cc
Checking for Symbol versioning... Yes.
Compiler error reporting is too harsh for ../configure (perhaps remove
-Werror).
** ../configure aborting.
make: *** [zlib-ng:80: /home/ummeegge/development/dev-aarch/ipfire-
2.x/log_aarch64/zlib-ng-2.2.5-tools] Error 1
make: Leaving directory '/home/ummeegge/development/dev-aarch/ipfire-
2.x/lfs'`

Could this be related to a compatibility issue between the new
toolchain and zlib-ng 2.2.5? Or is it possibly a misconfiguration in
the cross-compilation environment?

Any hints or suggestions would be greatly appreciated.

Best

Erik