For $WORK reasons, I want an up-to-date Go cross compiler for OpenEmbedded. Taking a look at existing efforts I ended up forking dodgerblue’s repository in order to fix a couple of issues, most notably, the fact that in order to bootstrap 1.5, the recipe goes behind bitbake’s back and downloads 1.4 source.
I was working with
Fido’s
core-image-minimal just to make sure that everything compiled ok in a
cross-build environment (more on that later). I ran into a weird issue
that I haven’t been able to track down, which causes one step of the 1.5
build process to fail because it ignores arguments passed as part of
the CC_FOR_TARGET environment variable. If I create a wrapper that
calls the correct compiler with the correct flags (--sysroot being the
important one), everything works, so for now that’s what’s present in
the layer.
The other issue that I ran into is that
OpenSwitch builds on x86_64 for x86_64.
Strictly speaking it’s still cross-compilation because it builds for a
different environment. The issue I’m running into is that I need a
compiler to run on the host (x86_64 → linux_amd64) and a compiler to
produce binaries for the target (genericx86-64 → linux_amd64). Go’s
almost magical cross-compilation support works perfectly when building
for a different OS/architecture combination, and breaks appart when
building for two targets that have the same combination. Since I need to
have CGO_ENABLED=1, this is where things stop workingi (binaries built
for genericx86-64 don’t work in x86_64). I suspect it’s simply a
matter of setting up the correct CC_FOR_TARGET values, but I still
need to figure it out. If that doesn’t work, I will need to produce two
sets of compilers, one native and one running on the host building
images for the target.
I will probably rework the recipe some more, because I’d prefer to have
a go-bootstrap dependency on go-cross for 1.5 onwards, just to avoid
compiling 1.4 over and over again every single time I make a change. The
next step after that is providing a class that other recipes can use to
build Go projects, and probably providing a recipe for
gb.
Enjoy!