commit 992ca197465ec487895af0ebb9c86139402c8a97
author Austin Foxley <afoxley@google.com> Wed Mar 12 16:05:54 2025 -0700
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> Wed Mar 12 16:05:54 2025 -0700
tree be4184f29403145c716bea9bd25780e166821848
parent 4bb2686b713f6903686ffd5f774ffd921551ea3d

pw_build: Add PW_MUST_NOT_PLACE

As a complement for PW_MUST_PLACE, define a linker script macro to
allow asserting that certain object files/sections have no contents
when linked.

This is useful to ensure that code that should have no variables
continues to have none, so it can be known to be safe for running in a
pre-memory initialized environment.

It is expected that if variables need to be added to such code, the
developer would switch the assertion to use PW_MUST_PLACE at that time.

Change-Id: I3fc389aa87c9e7839cd4eaa6d7c32bb181c6cc36
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/275012
Reviewed-by: Jonathon Reinhart <jrreinhart@google.com>
Commit-Queue: Austin Foxley <afoxley@google.com>
Tests-Not-Needed: Ted Pudlik <tpudlik@google.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Pigweed-Auto-Submit: Austin Foxley <afoxley@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>