Try to create arm prebuilds

[martenrichter]

No description provided.

[achingbrain]

Well this is tedious - https://boringssl.googlesource.com/boringssl/+/546093ca4a6b2bf9b7c29018687d53f8a2ad428a/CMakeLists.txt#300

In the olden times (e.g. during the ppc -> intel switch) you'd use a tool called lipo to make a universal binary from a ppc and an intel build. If boringssl only supports building one arch at a time that might be necessary?

[martenrichter]

Well this is tedious - https://boringssl.googlesource.com/boringssl/+/546093ca4a6b2bf9b7c29018687d53f8a2ad428a/CMakeLists.txt#300

In the olden times (e.g. during the ppc -> intel switch) you'd use a tool called lipo to make a universal binary from a ppc and an intel build. If boringssl only supports building one arch at a time that might be necessary.

Well, I have a problem, the lines did not turn cmake into multi-arch. So if boring does not support it anyway, I should cross-compile..., ok, I try again..... (sadly I did not find if one can access the arm GitHub runner beta test)

[achingbrain]

Ok so lipo is still bundled with XCode.

Certainly if I build this module locally I can create a universal binary from the arm64 version npm build creates and the x64 version downloaded from the latest release (I renamed the built webtransport.node file to webtransport_arm.node and the downloaded version to webtransport_x64.node to make it easier for me):

$ lipo -create webtransport_arm.node webtransport_x64.node -output webtransport.node
$ file webtransport.node 
webtransport.node: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit dynamically linked shared library x86_64Mach-O 64-bit dynamically linked shared library x86_64] [arm64]
webtransport.node (for architecture x86_64):    Mach-O 64-bit dynamically linked shared library x86_64
webtransport.node (for architecture arm64):     Mach-O 64-bit dynamically linked shared library arm64

The universal binary works for running the tests in this module (previously needing an arm64 build for me locally) and also in my libp2p test harness which for tedious reasons runs through rosetta so needs a x86_64 build.

[martenrichter]

Ok so lipo is still bundled with XCode.

Certainly if I build this module locally I can create a universal binary from the arm64 version npm build creates and the x64 version downloaded from the latest release (I renamed the built webtransport.node file to webtransport_arm.node and the downloaded version to webtransport_x64.node to make it easier for me):

$ lipo -create webtransport_arm.node webtransport_x64.node -output webtransport.node
$ file webtransport.node 
webtransport.node: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit dynamically linked shared library x86_64Mach-O 64-bit dynamically linked shared library x86_64] [arm64]
webtransport.node (for architecture x86_64):    Mach-O 64-bit dynamically linked shared library x86_64
webtransport.node (for architecture arm64):     Mach-O 64-bit dynamically linked shared library arm64

The universal binary works for running the tests in this module (previously needing an arm64 build for me locally) and also in my libp2p test harness which for tedious reasons runs through rosetta so needs a x86_64 build.

I try now if I can cross-compile, but than we will have separate binaries.

[martenrichter]

Should work now...