tree fa1a530f6cec77611e0ebae7a2167896b47ec16e
parent e6aba5efbe3e606e92f074350ece8de13693d597
author Matt Stokes <matthewbstokes@google.com> 1790035745 -0700
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1790035745 -0700

pw_build: Restrict -Wno-unused-template to Clang

The -Wno-unused-template warning option is Clang-specific. On GCC
compilers (such as arm-zephyr-eabi-gcc), passing this flag produces
spurious diagnostics when compilation fails or generates warnings:
"note: unrecognized command-line option '-Wno-unused-template' may have
been intended to silence earlier diagnostics".

Restrict -Wno-unused-template to Clang across CMake, GN, and Bazel
strict warning configurations, matching the pattern used for the
deprecated-attributes warning exemption.

Change-Id: Ifcd3993b2f6ad9348fc081e2e0cf170b234d44e5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/480645