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scx-upstream/meson.build
David Vernet 4a88008cbe
build: Allow specifying --werror build option 
meson has a builtin -werror option that can be passed to meson setup. So
as to allow users to specify if they want to treat warnings as errors,
let's add this flag to meson.build.

We elect to make the flag the default behavior for now, as warnings in
BPF scheds are not surfaced unless there is an actual compiler error.
The warning can be turned off by specifying `-D werror=false` when
invoking `meson setup`.

Signed-off-by: David Vernet <void@manifault.com>
2024-05-18 07:50:33 -05:00

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project('sched_ext schedulers', 'c',
version: '0.1.9',
license: 'GPL-2.0',
default_options: 'werror=true',)
if meson.version().version_compare('<1.2')
error('meson >= 1.2 required')
endif
fs = import('fs')
cc = meson.get_compiler('c')
enable_rust = get_option('enable_rust')
bpf_clang = find_program(get_option('bpf_clang'))
if enable_rust
cargo = find_program(get_option('cargo'))
endif
get_clang_ver = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/get_clang_ver'))
get_bpftool_ver = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/get_bpftool_ver'))
bpftool_build_skel = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/bpftool_build_skel'))
get_sys_incls = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/get_sys_incls'))
test_sched = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/test_sched'))
fetch_libbpf = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/fetch_libbpf'))
build_libbpf = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/build_libbpf'))
fetch_bpftool = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/fetch_bpftool'))
build_bpftool = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/build_bpftool'))
if enable_rust
cargo_fetch = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/cargo_fetch'))
endif
bpf_clang_ver = run_command(get_clang_ver, bpf_clang, check: true).stdout().strip()
if bpf_clang_ver == ''
error('Unable to find clang version')
endif
bpf_clang_maj = bpf_clang_ver.split('.')[0].to_int()
if bpf_clang_maj < 16
error('clang < 16 loses high 32 bits of 64 bit enums when compiling BPF (@0@ ver=@1@)'
.format(bpf_clang.full_path(), bpf_clang_ver))
elif bpf_clang_maj < 17
warning('clang >= 17 recommended (@0@ ver=@1@)'
.format(bpf_clang.full_path(), bpf_clang_ver))
endif
# These are for building libbpf and/or bpftool
if meson.get_compiler('c').get_id() == 'gcc'
extra_args = ['-Wno-sign-compare']
else
extra_args = []
endif
executable('cc_cflags_probe', 'meson-scripts/cc_cflags_probe.c', install: false, pie: true, c_args : extra_args)
jq = find_program('jq')
make = find_program('make')
nproc = find_program('nproc')
make_jobs = 1
if nproc.found()
make_jobs = run_command(nproc, check: true).stdout().to_int()
endif
libbpf_path = '@0@/libbpf'.format(meson.current_build_dir())
libbpf_src_path = '@0@/src'.format(libbpf_path)
libbpf_a = '@0@/libbpf.a'.format(libbpf_src_path)
should_build_libbpf = true
libbpf_h = get_option('libbpf_h')
libbpf_local_h = get_option('libbpf_h')
if get_option('libbpf_a') == 'disabled'
libbpf_a = ''
should_build_libbpf = false
elif get_option('libbpf_a') != ''
libbpf_a = get_option('libbpf_a')
if not fs.exists(libbpf_a)
error('@0@ does not exist.'.format(libbpf_a))
endif
should_build_libbpf = false
endif
# WARNING! To build libbpf with the same compiler(CC) and CFLAGS
# as the schedulers we need to do this hack whereby we create a dummy exe
# then read the compiler and args from meson's compile_commands.json
# and re-set them when we build libbpf with make
if should_build_libbpf
if not jq.found() or not make.found()
error('To build the libbpf library "make" and "jq" are required')
endif
libbpf_header_paths = ['/src/usr/include', '/include/uapi']
libbpf_h = []
# This exists because meson doesn't like absolute paths for include_directories
# if they are found within the same directory as the source
libbpf_local_h = []
local_build_path = meson.current_build_dir().replace(meson.current_source_dir(), '')
foreach path : libbpf_header_paths
libbpf_h += ['@0@'.format(libbpf_path) + path]
libbpf_local_h += ['.@0@/libbpf'.format(local_build_path) + path]
endforeach
message('Fetching libbpf repo')
libbpf_commit = '6d3595d215b014d3eddb88038d686e1c20781534'
run_command(fetch_libbpf, meson.current_build_dir(), libbpf_commit, check: true)
make_jobs = 1
if nproc.found()
make_jobs = run_command(nproc, check: true).stdout().to_int()
endif
libbpf = custom_target('libbpf',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/cc_cflags_probe.c',
command: [build_libbpf, jq, make, libbpf_src_path, '@0@'.format(make_jobs)],
build_by_default: true)
else
# this is a noop when we're not building libbpf ourselves
libbpf = custom_target('libbpf',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/cc_cflags_probe.c',
command: ['echo'],
build_by_default: true)
endif
if libbpf_a != ''
libbpf_dep = [declare_dependency(
link_args: libbpf_a,
include_directories: libbpf_local_h),
cc.find_library('elf'),
cc.find_library('z'),
cc.find_library('zstd')]
else
libbpf_dep = dependency('libbpf', version: '>=1.4')
endif
if get_option('kernel_headers') != ''
kernel_headers = get_option('kernel_headers')
kernel_dep = [declare_dependency(include_directories: kernel_headers)]
else
kernel_dep = []
endif
bpftool_path = '@0@/bpftool/src'.format(meson.current_build_dir())
should_build_bpftool = true
bpftool_exe_path = '@0@/bpftool'.format(bpftool_path)
if get_option('bpftool') == 'disabled'
bpftool = find_program('bpftool')
should_build_bpftool = false
bpftool_exe_path = bpftool.full_path()
elif get_option('bpftool') != ''
bpftool = find_program(get_option('bpftool'))
should_build_bpftool = false
bpftool_exe_path = bpftool.full_path()
endif
if should_build_bpftool
message('Fetching bpftool repo')
bpftool_commit = '20ce6933869b70bacfdd0dd1a8399199290bf8ff'
run_command(fetch_bpftool, meson.current_build_dir(), bpftool_commit, check: true)
bpftool_target = custom_target('bpftool_target',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/bpftool_dummy.c',
command: [build_bpftool, jq, make, bpftool_path, '@0@'.format(make_jobs)],
build_by_default: true)
else
bpftool_ver = run_command(get_bpftool_ver, bpftool_exe_path, check: true).stdout().strip()
bpftool_maj = bpftool_ver.split('.')[0].to_int()
bpftool_min = bpftool_ver.split('.')[1].to_int()
if bpftool_maj < 7 or (bpftool_maj == 7 and bpftool_min < 4)
error('bpftool >= 7.4 required (@0@ ver=@1@)'.format(bpftool_exe_path, bpftool_ver))
endif
# this is a noop when we're not building bpftool ourselves
bpftool_target = custom_target('bpftool_target',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/bpftool_dummy.c',
command: ['echo'],
build_by_default: true)
endif
# end libbpf/bpftool stuff
#
# Determine bpf_base_cflags which will be used to compile all .bpf.o files.
# Note that "-target bpf" is not included to accommodate
# libbpf_cargo::SkeletonBuilder.
#
# Map https://mesonbuild.com/Reference-tables.html#cpu-families to the
# __TARGET_ARCH list in tools/lib/bpf/bpf_tracing.h in the kernel tree.
#
arch_dict = {
'x86': 'x86',
'x86_64': 'x86',
's390x': 's390',
'arm': 'arm',
'aarch64': 'arm64',
'mips': 'mips',
'mips64': 'mips',
'ppc': 'powerpc',
'ppc64': 'powerpc',
'sparc': 'sparc',
'sparc64': 'sparc',
'riscv32': 'riscv',
'riscv64': 'riscv',
'arc': 'arc',
'loongarch64': 'loongarch'
}
cpu = host_machine.cpu_family()
if cpu not in arch_dict
error('CPU family "@0@" is not in known arch dict'.format(cpu))
endif
sys_incls = run_command(get_sys_incls, bpf_clang, check: true).stdout().splitlines()
bpf_base_cflags = ['-g', '-O2', '-Wall', '-Wno-compare-distinct-pointer-types',
'-D__TARGET_ARCH_' + arch_dict[cpu], '-mcpu=v3',
'-m@0@-endian'.format(host_machine.endian())] + sys_incls
if get_option('werror')
bpf_base_cflags += '-Werror'
endif
message('cpu=@0@ bpf_base_cflags=@1@'.format(cpu, bpf_base_cflags))
libbpf_c_headers = []
if libbpf_a != ''
foreach header: libbpf_h
libbpf_c_headers += ['-I', header]
endforeach
endif
#
# Generators to build BPF skel file for C schedulers.
#
gen_bpf_o = generator(bpf_clang,
output: '@BASENAME@.o',
depends: [libbpf],
arguments: [bpf_base_cflags, '-target', 'bpf', libbpf_c_headers, '@EXTRA_ARGS@',
'-c', '@INPUT@', '-o', '@OUTPUT@'])
gen_bpf_skel = generator(bpftool_build_skel,
output: ['@BASENAME@.skel.h','@BASENAME@.subskel.h' ],
depends: [libbpf, bpftool_target],
arguments: [bpftool_exe_path, '@INPUT@', '@OUTPUT0@', '@OUTPUT1@'])
#
# For rust sub-projects.
#
cargo_build_args = ['--quiet']
if get_option('buildtype') == 'release'
cargo_build_args += '--release'
endif
if get_option('offline')
cargo_build_args += '--offline'
endif
cargo_env = environment()
cargo_env.set('BPF_CLANG', bpf_clang.full_path())
foreach flag: bpf_base_cflags
cargo_env.append('BPF_BASE_CFLAGS', flag, separator: ' ')
endforeach
if libbpf_a != ''
foreach header: libbpf_h
cargo_env.append('BPF_EXTRA_CFLAGS_PRE_INCL', '-I' + header, separator: ' ')
endforeach
cargo_env.append('RUSTFLAGS',
'-C relocation-model=pic -C link-args=-lelf -C link-args=-lz -C link-args=-lzstd -L '
+ fs.parent(libbpf_a))
#
# XXX - scx_rusty's original Cargo.toml contained a dependency matching
# the following. However, it doesn't seem necessary to enable linking to
# libbpf.a. Ask Dan Schatzberg about the role the dependency line plays.
#
#cargo_build_args += ['--config',
# 'dependencies.libbpf-sys.version="1.2"',
# '--config',
# 'dependencies.libbpf-sys.features=["novendor", "static"]']
endif
if get_option('cargo_home') != ''
cargo_env.set('CARGO_HOME', get_option('cargo_home'))
endif
if enable_rust
meson.add_install_script('meson-scripts/install_rust_user_scheds')
run_target('fetch', command: [cargo_fetch, cargo], env: cargo_env)
endif
if get_option('kernel') != ''
kernel = get_option('kernel')
endif
run_target('test_sched', command: [test_sched, kernel])
if enable_rust
subdir('rust')
endif
subdir('scheds')
systemd = dependency('systemd', required: get_option('systemd'))
if systemd.found()
subdir('services/systemd')
endif
openrc = dependency('openrc', required: get_option('openrc'))
if openrc.found()
subdir('services/openrc')
endif
libalpm = dependency('libalpm', required: get_option('libalpm'))
if libalpm.found() and systemd.found()
subdir('libalpm/systemd')
endif
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