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meson: add experimental bpf-gcc compiler support
Not fully working but should make it easier to clean up remaining issues.
This commit is contained in:
James Hilliard
Zbigniew Jędrzejewski-Szmek
parent
02bf03405b
commit
76abad4d47
102
meson.build
102
meson.build
@ -1020,58 +1020,74 @@ conf.set10('HAVE_LIBBPF', libbpf.found())
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if want_bpf_framework == 'false' or not libbpf.found() or skip_deps
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conf.set10('BPF_FRAMEWORK', false)
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else
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# Support 'versioned' clang/llvm-strip binaries, as seen on Debian/Ubuntu
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# (like clang-10/llvm-strip-10)
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if meson.is_cross_build() or cc.get_id() != 'clang' or cc.cmd_array()[0].contains('afl-clang') or cc.cmd_array()[0].contains('hfuzz-clang')
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r = find_program('clang', required : bpf_framework_required, version : '>= 10.0.0')
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clang_found = r.found()
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if clang_found
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clang = r.path()
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bpf_compiler = get_option('bpf-compiler')
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clang_found = false
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clang_supports_bpf = false
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bpf_gcc_found = false
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deps_found = false
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if bpf_compiler == 'clang'
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# Support 'versioned' clang/llvm-strip binaries, as seen on Debian/Ubuntu
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# (like clang-10/llvm-strip-10)
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if meson.is_cross_build() or cc.get_id() != 'clang' or cc.cmd_array()[0].contains('afl-clang') or cc.cmd_array()[0].contains('hfuzz-clang')
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r = find_program('clang', required : bpf_framework_required, version : '>= 10.0.0')
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clang_found = r.found()
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if clang_found
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clang = r.path()
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endif
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# Assume that the required flags are supported by the found clang.
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clang_supports_flags = clang_found
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else
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clang_found = true
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clang = cc.cmd_array()
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clang_supports_flags = cc.has_argument('-Wno-compare-distinct-pointer-types')
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endif
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# Assume that the required flags are supported by the found clang.
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clang_supports_flags = clang_found
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else
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clang_found = true
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clang = cc.cmd_array()
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clang_supports_flags = cc.has_argument('-Wno-compare-distinct-pointer-types')
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if clang_found
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# Check if 'clang -target bpf' is supported.
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clang_supports_bpf = run_command(clang, '-target', 'bpf', '--print-supported-cpus', check : false).returncode() == 0
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endif
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elif bpf_compiler == 'gcc'
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warning('GCC BPF Compiler support is experimental and not recommended.')
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bpf_gcc = find_program('bpf-gcc',
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required : true,
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version : '>= 12.1.0')
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bpf_gcc_found = bpf_gcc.found()
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endif
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if clang_found
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# Check if 'clang -target bpf' is supported.
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clang_supports_bpf = run_command(clang, '-target', 'bpf', '--print-supported-cpus', check : false).returncode() == 0
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else
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clang_supports_bpf = false
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endif
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# Debian installs this in /usr/sbin/ which is not in $PATH.
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# We check for 'bpftool' first, honouring $PATH, and in /usr/sbin/ for Debian.
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# We use 'bpftool gen' subcommand, it was added by 985ead416df39d6fe8e89580cc1db6aa273e0175 (v5.6).
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bpftool = find_program('bpftool',
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'/usr/sbin/bpftool',
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required : false,
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version : '>= 5.13.0')
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if bpftool.found()
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bpftool_strip = true
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else
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bpftool_strip = false
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if clang_supports_bpf or bpf_gcc_found
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# Debian installs this in /usr/sbin/ which is not in $PATH.
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# We check for 'bpftool' first, honouring $PATH, and in /usr/sbin/ for Debian.
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# We use 'bpftool gen object' subcommand for bpftool strip, it was added by d80b2fcbe0a023619e0fc73112f2a02c2662f6ab (v5.13).
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bpftool = find_program('bpftool',
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'/usr/sbin/bpftool',
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required : bpf_framework_required,
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version : '>= 5.6.0')
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endif
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required : false,
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version : '>= 5.13.0')
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if not bpftool_strip
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if not meson.is_cross_build() and clang_found
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llvm_strip_bin = run_command(clang, '--print-prog-name', 'llvm-strip',
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check : true).stdout().strip()
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if bpftool.found()
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bpftool_strip = true
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deps_found = true
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else
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llvm_strip_bin = 'llvm-strip'
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bpftool_strip = false
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# We require the 'bpftool gen skeleton' subcommand, it was added by 985ead416df39d6fe8e89580cc1db6aa273e0175 (v5.6).
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bpftool = find_program('bpftool',
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'/usr/sbin/bpftool',
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required : bpf_framework_required,
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version : '>= 5.6.0')
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endif
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llvm_strip = find_program(llvm_strip_bin, required : bpf_framework_required, version : '>= 10.0.0')
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endif
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deps_found = clang_found and clang_supports_bpf and clang_supports_flags and (bpftool_strip or llvm_strip.found()) and bpftool.found()
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# We use `llvm-strip` as a fallback if `bpftool gen object` strip support is not available.
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if not bpftool_strip and bpftool.found() and clang_supports_bpf
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if not meson.is_cross_build()
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llvm_strip_bin = run_command(clang, '--print-prog-name', 'llvm-strip',
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check : true).stdout().strip()
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else
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llvm_strip_bin = 'llvm-strip'
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endif
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llvm_strip = find_program(llvm_strip_bin, required : bpf_framework_required, version : '>= 10.0.0')
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deps_found = llvm_strip.found()
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endif
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endif
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# Can build BPF program from source code in restricted C
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conf.set10('BPF_FRAMEWORK', deps_found)
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@ -496,6 +496,8 @@ option('kernel-install', type: 'boolean', value: 'true',
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option('analyze', type: 'boolean', value: 'true',
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description : 'install systemd-analyze')
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option('bpf-compiler', type : 'combo', choices : ['clang', 'gcc'],
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description: 'compiler used to build BPF programs, note: gcc is experimental')
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option('bpf-framework', type : 'combo', choices : ['auto', 'true', 'false'],
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description: 'build BPF programs from source code in restricted C')
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@ -4,7 +4,7 @@ if conf.get('BPF_FRAMEWORK') != 1
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subdir_done()
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endif
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clang_flags = [
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bpf_clang_flags = [
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'-Wno-compare-distinct-pointer-types',
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'-O2',
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'-target',
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@ -13,6 +13,14 @@ clang_flags = [
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'-c',
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]
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bpf_gcc_flags = [
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'-O2',
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'-mkernel=5.2',
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'-mcpu=v3',
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'-mco-re',
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'-gbtf',
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]
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# Generate defines that are appropriate to tell the compiler what architecture
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# we're compiling for. By default we just map meson's cpu_family to __<cpu_family>__.
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# This dictionary contains the exceptions where this doesn't work.
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@ -30,19 +38,32 @@ cpu_arch_defines = {
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'arm' : ['-D__arm__', '-D__ARM_PCS_VFP'],
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}
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clang_arch_flags = cpu_arch_defines.get(host_machine.cpu_family(),
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['-D__@0@__'.format(host_machine.cpu_family())])
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bpf_arch_flags = cpu_arch_defines.get(host_machine.cpu_family(),
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['-D__@0@__'.format(host_machine.cpu_family())])
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if bpf_compiler == 'gcc'
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bpf_arch_flags += ['-m' + host_machine.endian() + '-endian']
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endif
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libbpf_include_dir = libbpf.get_variable(pkgconfig : 'includedir')
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bpf_o_unstripped_cmd = [
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clang,
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clang_flags,
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clang_arch_flags,
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'-I.'
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]
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bpf_o_unstripped_cmd = []
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if bpf_compiler == 'clang'
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bpf_o_unstripped_cmd += [
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clang,
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bpf_clang_flags,
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bpf_arch_flags,
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]
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elif bpf_compiler == 'gcc'
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bpf_o_unstripped_cmd += [
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bpf_gcc,
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bpf_gcc_flags,
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bpf_arch_flags,
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]
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endif
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if not meson.is_cross_build()
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bpf_o_unstripped_cmd += ['-I.']
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if not meson.is_cross_build() and bpf_compiler == 'clang'
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target_triplet_cmd = run_command('gcc', '-dumpmachine', check: false)
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if target_triplet_cmd.returncode() == 0
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target_triplet = target_triplet_cmd.stdout().strip()
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@ -69,7 +90,7 @@ if bpftool_strip
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'@OUTPUT@',
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'@INPUT@'
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]
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else
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elif bpf_compiler == 'clang'
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bpf_o_cmd = [
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llvm_strip,
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'-g',
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