tools: use LDFLAGS_host for host toolset

[isuruf]

This makes the behaviour similar to that of CFLAGS_host

[richardlau]

This should be upstreamed first to https://github.com/nodejs/gyp-next.

[isuruf]

Thanks. Done in nodejs/gyp-next#98

[targos]

What is the use case in Node.js ?

[isuruf]

To cross compile nodejs to a different platform. (My use case is for compiling in x86_64-apple-darwin for aarch64-apple-darwin.)

[targos]

I wonder why we never had the need before. We already cross-compile for ARM on Linux.

[isuruf]

I think that's because the compiler is smart enough to ignore the libraries for target platform and look for only the host libraries when building host executables. In my case, I needed to give some library directories (-L flags) for host because they were not in a standard directory.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/36256/

[targos]

I launched CI to check whether our cross-compilation setup works with the change.

[minrk]

FWIW, with this and the patch for torque referenced in #37441, we now have working cross-compilation from mac-x86_64 to mac-arm64.

[targos]

This was included in #38867. Thanks for the PRs!