roll: pigweed, pw_toolchain: pw_ide: Add option to process comp DBs by path

As an alternative to the current method of searching for compilation
databases in your source and build tree, this adds an option to
directly specify the path(s). This is particularly helpful for Bazel-
based projects for two reasons:

1. The predominant approach to generating compile commands in Bazel
   world is to just generate a single file with all commands in the
   root dir of the project, so there's no need to search for files.

2. By default, tooling runs within the Bazel environment, which could
   be located somewhere completely different from project checkout dir.
   So the search-based approach's assumptions of known source and build
   dirs breaks down.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/218334
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pigweed, pw_toolchain Rolled-Commits: 51ed6ec5209e23c..64f458827b65993
Roller-URL: https://ci.chromium.org/b/8744048389785160017
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I2a9fe22d62e072a7475c74884465aa8029799197
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/218491
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
1 file changed
tree: 7ee6d35b8737d3e5b28c0fa5ad57ace2b2e08730
  1. .github/
  2. src/
  3. targets/
  4. tools/
  5. .bazelignore
  6. .bazelrc
  7. .bazelversion
  8. .gitignore
  9. BUILD.bazel
  10. echo.bzl
  11. LICENSE
  12. pigweed.json
  13. README.md
  14. requirements.in
  15. requirements_lock.txt
  16. WORKSPACE
README.md

Pigweed: minimal Bazel example

This repository contains a minimal example of a Bazel-based Pigweed project. It's an echo application for the STM32F429 Discovery Board.

Cloning

git clone --recursive https://pigweed.googlesource.com/pigweed/quickstart/bazel

If you already cloned but forgot to include --recursive, run git submodule update --init to pull all submodules.

TODO: b/300695111 - Don't require submodules for this example.

Building

We‘ll assume you already have Bazel on your system. If you don’t, the recommended way to get it is through Bazelisk.

To build the entire project (including building the application for both the host and the STM32 Discovery Board), run

bazel build //...

To run the application locally on your machine, run,

bazel run //src:echo

Flashing

To flash the firmware to a STM32F429 Discovery Board connected to your machine, run,

bazel run //tools:flash

Note that you don't need to build the firmware first: Bazel knows that the firmware images are needed to flash the board, and will build them for you. And if you edit the source of the firmware or any of its dependencies, it will get rebuilt when you flash.

Communicating

Run,

bazel run //tools:miniterm -- /dev/ttyACM0 --filter=debug

to communicate with the board. When you transmit a character, you should get the same character back!