On Tue, 2022-06-28 at 11:00 +0200, Peter Bergin wrote:

On 2022-06-19 22:47, Peter Bergin wrote:


The reason for this issue seems to be this commit:

    commit 781eaa955dce5deab47371c25dae72b36c011900
    Author: Richard Purdie <richard.purdie@...>
    Date:   Sat May 21 14:02:47 2022 +0100

        rust-common: Drop LLVM_TARGET and simplify

        This all seems over complicated for something which is
basically always
        one of two values. This might even help cross-canadian work on
something
        which isn't x86-64.

        (From OE-Core rev: bd36593ba3db758b3eacc974e48468a665967961)

        Signed-off-by: Richard Purdie <richard.purdie@...>


When building rust-cross-canadian-aarch64 the file
'tmp/work/x86_64-nativesdk-pokysdk-linux/rust-cross-canadian-aarch64/1.60.0-r0/targets/aarch64-poky-linux.json'
will be populated with the information '"llvm-target":
"x86_64-unknown-linux-gnu"'. This will lead to object files in wrong
format during 'Building stage2 std artifacts (x86_64-unknown-linux-gnu
-> aarch64-poky-linux)' in the do_compile step.

In 'meta/recipes-devtools/rust/rust-common.inc':

    # build tspec
    tspec = {}
    if bb.data.inherits_class('cross-canadian', d):
        tspec['llvm-target'] = d.getVar('RUST_HOST_SYS', arch_abi)
    else:
        tspec['llvm-target'] = d.getVar('RUST_TARGET_SYS', arch_abi)

So for some reason it seems intentional to set 'llvm-target' to HOST_SYS
when 'cross-canadian'. The behavior has changed with this patch. Before
'llvm-target' was set to RUST_TARGET_SYS for all target archs other than
x86_64 where it was set to RUST_HOST_SYS. I guess this change has to do
with the commit message 'This might even help cross-canadian work on
something which isn't x86-64.'? But unfortunately it seems to break the
case building on x86_64 for aarch64. It would be good to get some help
here to sort this out.

I'm wondering if we need something like:

diff --git a/meta/recipes-devtools/rust/rust-common.inc b/meta/recipes-devtools/rust/rust-common.inc
index 621cd4ad576..ef70c48d0f4 100644
--- a/meta/recipes-devtools/rust/rust-common.inc
+++ b/meta/recipes-devtools/rust/rust-common.inc
@@ -309,10 +309,7 @@ def rust_gen_target(d, thing, wd, features, cpu, arch, abi=""):

# build tspec
tspec = {}
- if bb.data.inherits_class('cross-canadian', d):
- tspec['llvm-target'] = d.getVar('RUST_HOST_SYS', arch_abi)
- else:
- tspec['llvm-target'] = d.getVar('RUST_TARGET_SYS', arch_abi)
+ tspec['llvm-target'] = d.getVar('RUST_TARGET_SYS', arch_abi)
tspec['data-layout'] = d.getVarFlag('DATA_LAYOUT', arch_abi)
tspec['max-atomic-width'] = int(d.getVarFlag('MAX_ATOMIC_WIDTH', arch_abi))
tspec['target-pointer-width'] = d.getVarFlag('TARGET_POINTER_WIDTH', arch_abi)


?

Cheers,

Richard