[roll third_party/pigweed] cmake: Set the PW_ROOT env variable in pigweed.cmake

Instead of setting the PW_ROOT environment variable inside of the
root CMakeLists.txt, it is set if if needed through
pw_build/pigweed.cmake.

In addition, the provided toolchain files are updated to use the
relative path to ../../pw_build/pigweed.cmake to ensure they work
in environments which are not bootstraped.

This ensures that both the upstream toolchains and Pigweed's
CMake tooling in general can be used outside of a bootstrapped
environment.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/74360

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 5825e5c1b1c82d1..648b210c92e6267
Roller-URL: https://ci.chromium.org/b/8827764373241033393
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8827764373241033393
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib52c179e071160851404e62a69f59ae9071bdeb7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/74441
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
1 file changed
tree: f23af05969f7ec7549e0e119abdd204372fcb878
  1. applications/
  2. build_overrides/
  3. pw_board_led/
  4. pw_board_led_arduino/
  5. pw_board_led_host/
  6. pw_board_led_stm32cube/
  7. pw_board_led_stm32f429i_disc1/
  8. pw_spin_delay/
  9. pw_spin_delay_arduino/
  10. pw_spin_delay_host/
  11. pw_spin_delay_stm32cube/
  12. pw_spin_delay_stm32f429i_disc1/
  13. targets/
  14. third_party/
  15. tools/
  16. .gitattributes
  17. .gitignore
  18. .gitmodules
  19. .gn
  20. activate.bat
  21. banner.txt
  22. bootstrap.bat
  23. bootstrap.sh
  24. BUILD.gn
  25. BUILDCONFIG.gn
  26. env_setup.json
  27. navbar.md
  28. OWNERS
  29. PW_PLUGINS
  30. README.md
README.md

Pigweed Experimental

This repository contains experimental pigweed modules.

Repository setup

Clone this repo with --recursive to get all required submodules.

git clone --recursive https://pigweed.googlesource.com/pigweed/experimental

This will pull the Pigweed source repository into third_party/pigweed. If you already cloned but forgot to --recursive run git submodule update --init to pull all submodules.