[BUG] Build error - missing pigweed libc++.a (M1 Ventura 13.1)

[zcduthie]

Reproduction steps

Attempting to build both all-clusters-app for darwin arm64 and ./gn_build.sh produce the same error.
clang: error: no such file or directory: '../../.environment/cipd/packages/pigweed/lib/libc++.a'
(full logs attached below)

Fresh checkout/setup and:

cd ~/connectedhomeip
source scripts/activate.sh
./gn_build.sh

gn_build.log

This does not occur when targeting a different (non-mac) architecture. Can successfully build Android CHIP Tool via ./scripts/build/build_examples.py --target android-arm64-chip-tool build

Bug prevalence

Whenever I do this

GitHub hash of the SDK that was being used

ca086f2

Platform

darwin

Platform Version(s)

Apple M1, Ventura 13.1

Anything else?

The entire lib folder is missing from .environment/cipd/packages/pigweed/

Various attempts at different versions of the SDK, pigweed, force removing .environment and re-bootstrapping haven't been able to fix / generate it.

pw_doctor.log

[bzbarsky-apple]

Pigweed does not provide an ARM toolchain for M1/M2 macs, as far as I can tell.

The default "./gn_build.sh" tries to build things with multiple compilers, including this non-existent toolchain, for some of the tests it runs.

I think passing enable_host_clang_boringssl_crypto_tests=false to ./gn_build.sh might help work around that...

@andy31415

[zcduthie]

Thanks - looks like that must be the culprit.

I originally came across this issue following the instructions at https://github.com/project-chip/connectedhomeip/tree/master/examples/all-clusters-app/linux:

To compile on an Arm Mac, run:
$ ./scripts/run_in_build_env.sh "./scripts/build/build_examples.py --target darwin-arm64-all-clusters-no-ble-asan-clang build"

Does this mean darwin-arm64 targeted scripts won't currently work?

[bzbarsky-apple]

This should work:

$ ./scripts/run_in_build_env.sh "./scripts/build/build_examples.py --target darwin-arm64-all-clusters-no-ble-asan build"

(i.e. without the "-clang" suffix). That suffix means "use pigweed clang instead of the system one" on Mac, as far as I can tell, and on M1 there is no pigweed clang.....

[bzbarsky-apple]

(And we should either fix the script to work or fix the documentation or both....)

[zcduthie]

$ ./scripts/run_in_build_env.sh "./scripts/build/build_examples.py --target darwin-arm64-all-clusters-no-ble-asan build"

Can confirm that this worked for me.

[bzbarsky-apple]

I created #24775 to fix the documentation for now.