commit 60498cb65400f90df941a2031e0bc285f18c1f9c
author Alexei Frolov <frolv@google.com> Wed Sep 21 21:51:46 2022 +0000
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> Wed Sep 21 21:51:46 2022 +0000
tree 8eeb51a88530bdaf0f0180c3b168c8b8a2aeb38a
parent 566dda4bd355bd372547c356e2316130e5268036

pw_build: GN template to evaluate expressions in a file

Pigweed's GN build wraps all invocations of a Python script with a
Python runner. One of the runner's main purposes is to determine the
binary outputs of GN libraries and executables, as this information
is not available through GN itself.

Sometimes, it is cumbersome or unfeasible to pass information to a
script through its command line arguments. Instead, the necessary
data is often written to a file for the script to parse. However,
doing so from within GN bypasses Pigweed's Python runner binary
resolution. `bloat.py` is an example of this -- it needed to import
and run the resolution logic itself.

This adds a template which runs GN binary resolution on files, enabling
the above use case more generally through the build system.

Change-Id: I70ca6e33e974f4b73e723295997c6197b0e91e43
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/108990
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Alexei Frolov <frolv@google.com>
Reviewed-by: Brandon Vu <brandonvu@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>