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This had changed when we added project variants and had to split
up the loading steps a bit, now all is back to normal without variants.
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This command adds initial cross-compilation support to BuildStream.
It has been tested against a converted version of the Baserock
compiler bootstrap and used to cross build sysroots for armv8l64 and ppc64l
from an x86_64 host.
For example, to build a sysroot for ARM v8 64-bit you can do this:
bst build --target-arch=armv8b64 gnu-toolchain/stage2.bst
This would cause the adapted Baserock definitions to produce a stage1 simple
cross compiler that runs on the native architecture and produces armv8b64
binaries, and then cross build a stage2 sysroot that executes on armv8b64.
Currently the --host-arch option does nothing of use. It will one day
enable host-incompatible builds using a QEMU-powered cross sandbox.
The `--arch=` option is now shorthand for `--host-arch= --target-arch=`.
Elements have 2 new variables available, %{bst-host-arch} and
%{bst-target-arch}. The 'arches' conditional now follows %{bst-target-arch},
while the new 'host-arches' conditional follows %{bst-host-arch}. All
of --arch, --host-arch and --target-arch default to the output of `uname -a`.
There's no magic here that would make all BuildStream elements suddenly
able to cross compile. It is up to an individual element to support this by
honouring %{bst-target-arch} in whatever way makes sense.
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o Tests for basic file loading
o Tests for include directive functionality
o Tests for resolution of arch conditionals
o Tests for dependency resolution and detecting circular dependencies
o Tests for variants, ensures that we have the correct variant conflict errors
and that the correct variants are chosen in the correct cases
o Tests for stacks, test that stacks with embedded elements unwrap properly
into the concrete dependency tree, test for internal stack circular dependencies,
test that arch conditionals and variant conditionals work inside stacks including
with embedded elements
Lots of tests
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