[roll third_party/pigweed] CMake build: Change how third party libraries are included

- Always use dir_pw_third_party_nanopb as a path.
- Improve error messages when building Nanopb protos without
  dir_pw_third_party_nanopb set.
- Specify python3 instead of python in case the build isn't run in a
  Python 3 virtual environment.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/38400

third_party/pigweed Rolled-Commits: 7df6664d5739fa1..8f357f439ea576c
Roller-URL: https://ci.chromium.org/b/8852465449253781392
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8852465449253781392
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I47730c25a58d833f56c2eb4898d9f9771bdf2e5e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/38441
Reviewed-by: 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: baaf5954d5cbcef3b33109caac7f49d18c88ce65
  1. applications/
  2. build_overrides/
  3. pw_board_led/
  4. pw_board_led_arduino/
  5. pw_board_led_host/
  6. pw_board_led_stm32f429i_disc1/
  7. pw_console/
  8. pw_spin_delay/
  9. pw_spin_delay_arduino/
  10. pw_spin_delay_host/
  11. pw_spin_delay_stm32f429i_disc1/
  12. targets/
  13. third_party/
  14. tools/
  15. .gitattributes
  16. .gitignore
  17. .gitmodules
  18. .gn
  19. activate.bat
  20. banner.txt
  21. bootstrap.bat
  22. bootstrap.sh
  23. BUILD.gn
  24. BUILDCONFIG.gn
  25. navbar.md
  26. PW_PLUGINS
  27. 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.