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# The clang-tidy target for Lix
run_clang_tidy = find_program('run-clang-tidy', required : false)
# Although this looks like it wants to be pkg-config, pkg-config does not
# really work for *plugins*, which are executable-like .so files that also
# cannot be found via find_program. Fun!
if get_option('lix-clang-tidy-checks-path') != ''
lix_clang_tidy_so = get_option('lix-clang-tidy-checks-path')
lix_clang_tidy_so_found = true
else
lix_clang_tidy_subproj = subproject(
'lix-clang-tidy',
required : false,
default_options : {'build-by-default': false}
)
if lix_clang_tidy_subproj.found()
lix_clang_tidy_so = lix_clang_tidy_subproj.get_variable('lix_clang_tidy')
lix_clang_tidy_so_found = true
else
lix_clang_tidy_so_found = false
endif
endif
# Due to numerous problems, such as:
# - Meson does not expose pch targets, but *fine*, I can just ask Ninja for
# them with `ninja -t targets rule cpp_PCH` and build them manually:
# https://github.com/mesonbuild/meson/issues/13499
# - Nixpkgs stdenv buries the cc-wrapper under a giant pile of assumptions
# about the cc-wrapper actually being used on the cc of a stdenv, rather than
# independently for clang-tidy, and we need to use cc-wrapper to get the
# correct hardening flags so that clang-tidy can actually parse the PCH file
#
# I give up. I am going to delete the damn PCH args and then it will work.
meson.add_postconf_script(
python,
meson.current_source_dir() / 'clean_compdb.py',
meson.global_build_root() / 'compile_commands.json',
meson.current_build_dir() / 'compile_commands.json',
)
# Horrible hack to get around not being able to depend on another target's
# generated headers in any way in the meson DSL
# https://github.com/mesonbuild/meson/issues/12817 which was incorrectly
# closed, if you *actually* need to generate the files once.
# Also related: https://github.com/mesonbuild/meson/issues/3667
#
# Or we could ban meson generators because their design is broken.
build_all_generated_headers = custom_target(
command : [
python,
meson.current_source_dir() / 'build_required_targets.py',
meson.global_build_root(),
],
output : 'generated_headers.stamp',
build_by_default : false,
build_always_stale : true,
)
if lix_clang_tidy_so_found
default_concurrency = run_command(python, '-c', '''
import multiprocessing
import os
print(min(multiprocessing.cpu_count(), int(os.environ.get("NIX_BUILD_CORES", "16"))))
''', check : true).stdout()
run_clang_tidy_args = [
'-load',
lix_clang_tidy_so,
'-p',
# We have to workaround a run-clang-tidy bug too, so we must give the
# directory name rather than the actual compdb file.
# https://github.com/llvm/llvm-project/issues/101440
meson.current_build_dir(),
'-quiet',
'-j', default_concurrency,
]
run_target(
'clang-tidy',
command : [
# XXX: This explicitly invokes it with python because of a nixpkgs bug
# where clang-unwrapped does not patch interpreters in run-clang-tidy.
# However, making clang-unwrapped depend on python is also silly, so idk.
python,
run_clang_tidy,
run_clang_tidy_args,
'-warnings-as-errors',
'*',
],
depends : [
build_all_generated_headers,
],
)
run_target(
'clang-tidy-fix',
command : [
python,
run_clang_tidy,
run_clang_tidy_args,
'-fix',
],
depends : [
build_all_generated_headers,
],
)
endif
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