arm64 cross-compile fails on amd64

[jgowdy]

Version

16.14.2

Platform

Linux bx.ee 5.4.0-89-generic #100-Ubuntu SMP Fri Sep 24 14:50:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

./configure --cross-compiling --dest-cpu arm64 --dest-os linux && make -j8

How often does it reproduce? Is there a required condition?

Every time

What is the expected behavior?

If cross-compiling is supported, I would expect that supplying the --cross-compiling flag would avoid attempting to run cross-compiled executables like icupkg on the host architecture which wouldn't rationally be expected to succeed.

What do you see instead?

  LD_LIBRARY_PATH=/home/jgowdy/projects/build-node-pac/node/out/Release/lib.host:/home/jgowdy/projects/build-node-pac/node/out/Release/lib.target:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../tools/icu; mkdir -p /home/jgowdy/projects/build-node-pac/node/out/Release/obj/gen; "/home/jgowdy/projects/build-node-pac/node/out/Release/icupkg" -tl ../../deps/icu-tmp/icudt70l.dat "/home/jgowdy/projects/build-node-pac/node/out/Release/obj/gen/icudt70l.dat"
/bin/sh: 1: /home/jgowdy/projects/build-node-pac/node/out/Release/icupkg: Exec format error

Additional information

I did see #11931 however this isn't related to Android, just being able to cross-compile arm64 Linux binaries on amd64.

[jgowdy]

file /home/jgowdy/projects/build-node-pac/node/out/Release/icupkg
/home/jgowdy/projects/build-node-pac/node/out/Release/icupkg: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=22c61f6274ea8f86832526cdd4a88a782da323e9, for GNU/Linux 3.7.0, not stripped

[bnoordhuis]

icupkg's build rules say it should be built for the host arch, not the target arch.

The rules are in tools/icu/icu-generic.gyp. Note how icpupkg itself declares 'toolsets': ['host'] and its dependents list it as icupkg#host.

My guess is this is related to your local toolchains, it's not picking up the right one. Run make AR_host=.. CC_host=.. CXX_host=.. to point it to the host toolchain and AR_target=.. etc. for the target toolchain.