kernel/linux/meson.build

   1 # SPDX-License-Identifier: BSD-3-Clause
   2 # Copyright(c) 2018 Intel Corporation
   3
   4 subdirs = ['kni']
   5
   6 kernel_build_dir = get_option('kernel_dir')
   7 kernel_install_dir = ''
   8 install = not meson.is_cross_build()
   9 cross_args = []
  10
  11 if not meson.is_cross_build()
  12         # native build
  13         kernel_version = run_command('uname', '-r').stdout().strip()
  14         kernel_install_dir = '/lib/modules/' + kernel_version + '/extra/dpdk'
  15         if kernel_build_dir == ''
  16                 # use default path for native builds
  17                 kernel_build_dir = '/lib/modules/' + kernel_version + '/build'
  18         endif
  19
  20         # test running make in kernel directory, using "make kernelversion"
  21         make_returncode = run_command('make', '-sC', kernel_build_dir,
  22                         'kernelversion').returncode()
  23         if make_returncode != 0
  24                 # backward compatibility:
  25                 # the headers could still be in the 'build' subdir
  26                 if not kernel_build_dir.endswith('build') and not kernel_build_dir.endswith('build/')
  27                         kernel_build_dir = join_paths(kernel_build_dir, 'build')
  28                         make_returncode = run_command('make', '-sC', kernel_build_dir,
  29                                         'kernelversion').returncode()
  30                 endif
  31         endif
  32
  33         if make_returncode != 0
  34                 error('Cannot compile kernel modules as requested - are kernel headers installed?')
  35         endif
  36
  37         # DO ACTUAL MODULE BUILDING
  38         foreach d:subdirs
  39                 subdir(d)
  40         endforeach
  41
  42         subdir_done()
  43 endif
  44
  45 # cross build
  46 # if we are cross-compiling we need kernel_build_dir specified
  47 if kernel_build_dir == ''
  48         error('Need "kernel_dir" option for kmod compilation when cross-compiling')
  49 endif
  50 cross_compiler = find_program('c').path()
  51 if cross_compiler.endswith('gcc')
  52         cross_prefix = run_command([py3, '-c', 'print("' + cross_compiler + '"[:-3])']).stdout().strip()
  53 elif cross_compiler.endswith('clang')
  54         cross_prefix = ''
  55         found_target = false
  56         # search for '-target' and use the arg that follows
  57         # (i.e. the value of '-target') as cross_prefix
  58         foreach cross_c_arg : meson.get_cross_property('c_args')
  59                 if found_target and cross_prefix == ''
  60                         cross_prefix = cross_c_arg
  61                 endif
  62                 if cross_c_arg == '-target'
  63                         found_target = true
  64                 endif
  65         endforeach
  66         if cross_prefix == ''
  67                 error('Didn\'t find -target and its value in' +
  68                       ' c_args in input cross-file.')
  69         endif
  70         linker = 'lld'
  71         foreach cross_c_link_arg : meson.get_cross_property('c_link_args')
  72                 if cross_c_link_arg.startswith('-fuse-ld')
  73                         linker = cross_c_link_arg.split('=')[1]
  74                 endif
  75         endforeach
  76         cross_args += ['CC=@0@'.format(cross_compiler), 'LD=ld.@0@'.format(linker)]
  77 else
  78         error('Unsupported cross compiler: @0@'.format(cross_compiler))
  79 endif
  80
  81 cross_arch = host_machine.cpu_family()
  82 if host_machine.cpu_family() == 'aarch64'
  83         cross_arch = 'arm64'
  84 endif
  85
  86 cross_args += ['ARCH=@0@'.format(cross_arch),
  87         'CROSS_COMPILE=@0@'.format(cross_prefix)]
  88
  89 # DO ACTUAL MODULE BUILDING
  90 foreach d:subdirs
  91         subdir(d)
  92 endforeach