clang-tidy with 1 extra custom rule executable 2GB+

[Quuxplusone]

Bugzilla Link	PR51870
Status	NEW
Importance	P normal
Reported by	Ben Morris (bensan.morris@googlemail.com)
Reported on	2021-09-15 08:38:49 -0700
Last modified on	2021-09-16 00:56:00 -0700
Version	unspecified
Hardware	Other Linux
CC	alexfh@google.com, djasper@google.com, klimek@google.com
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Hi, I've added some custom checks to clang-tidy and am building under CMake as
described below.

The generated clang-tidy executable is huge (2GB).

# just configure for building clang-tools-extra
cmake -G "Ninja" -B build -DLLVM_CCACHE_BUILD=ON -
DLLVM_CCACHE_DIR=$(CCACHE_DIR) -DLLVM_TARGETS_TO_BUILD=X86 -
DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra"

# build clang tidy
cd build
cmake --build . --config Release --target clang-tidy

Why is clang-tidy so large?

Also, regarding deployment of a custom clang-tidy I tried to generate an
install from the above configuration as follows:

# install so we can zip up and distribute just what we've configured above
cmake --install . --config Release --prefix some_path

but the make install failed owing to what appears to be targets (not built by
the above config) expecting to have been generated / installable.

Many thanks in advance,
Ben.

[Quuxplusone]

If I strip -s clang-tidy its file size reduces to 153MB (was 2GB)