-subdirs = ['igb_uio', 'kni']
-
-WARN_CROSS_COMPILE='Need "kernel_dir" option for kmod compilation when cross-compiling'
-WARN_NO_HEADERS='Cannot compile kernel modules as requested - are kernel headers installed?'
-
-# if we are cross-compiling we need kernel_dir specified
-# NOTE: warning() function only available from version 0.44 onwards
-if get_option('kernel_dir') == '' and meson.is_cross_build()
- if meson.version().version_compare('>=0.44')
- warning(WARN_CROSS_COMPILE)
- else
- message('WARNING: ' + WARN_CROSS_COMPILE)
- endif
+subdirs = ['kni']
+
+kernel_build_dir = get_option('kernel_dir')
+kernel_source_dir = get_option('kernel_dir')
+kernel_install_dir = ''
+install = not meson.is_cross_build()
+cross_args = []
+
+if not meson.is_cross_build()
+ # native build
+ kernel_version = run_command('uname', '-r', check: true).stdout().strip()
+ if kernel_source_dir != ''
+ # Try kernel release from sources first
+ r = run_command('make', '-s', '-C', kernel_source_dir, 'kernelrelease', check: false)
+ if r.returncode() == 0
+ kernel_version = r.stdout().strip()
+ endif
+ else
+ # use default path for native builds
+ kernel_source_dir = '/lib/modules/' + kernel_version + '/source'
+ endif
+ kernel_install_dir = '/lib/modules/' + kernel_version + '/extra/dpdk'
+ if kernel_build_dir == ''
+ # use default path for native builds
+ kernel_build_dir = '/lib/modules/' + kernel_version + '/build'
+ endif
+
+ # test running make in kernel directory, using "make kernelversion"
+ make_returncode = run_command('make', '-sC', kernel_build_dir,
+ 'kernelversion', check: true).returncode()
+ if make_returncode != 0
+ # backward compatibility:
+ # the headers could still be in the 'build' subdir
+ if not kernel_build_dir.endswith('build') and not kernel_build_dir.endswith('build/')
+ kernel_build_dir = join_paths(kernel_build_dir, 'build')
+ make_returncode = run_command('make', '-sC', kernel_build_dir,
+ 'kernelversion', check: true).returncode()
+ endif
+ endif
+
+ if make_returncode != 0
+ error('Cannot compile kernel modules as requested - are kernel headers installed?')
+ endif
+
+ # DO ACTUAL MODULE BUILDING
+ foreach d:subdirs
+ subdir(d)
+ endforeach
+
+ subdir_done()
+endif
+
+# cross build
+# if we are cross-compiling we need kernel_build_dir specified
+if kernel_build_dir == ''
+ error('Need "kernel_dir" option for kmod compilation when cross-compiling')
+endif
+cross_compiler = find_program('c').path()
+if cross_compiler.endswith('gcc')
+ cross_prefix = run_command([py3, '-c', 'print("' + cross_compiler + '"[:-3])'],
+ check: true).stdout().strip()
+elif cross_compiler.endswith('clang')
+ cross_prefix = ''
+ found_target = false
+ # search for '-target' and use the arg that follows
+ # (i.e. the value of '-target') as cross_prefix
+ foreach cross_c_arg : meson.get_cross_property('c_args')
+ if found_target and cross_prefix == ''
+ cross_prefix = cross_c_arg
+ endif
+ if cross_c_arg == '-target'
+ found_target = true
+ endif
+ endforeach
+ if cross_prefix == ''
+ error('Did not find -target and its value in c_args in input cross-file.')
+ endif
+ linker = 'lld'
+ foreach cross_c_link_arg : meson.get_cross_property('c_link_args')
+ if cross_c_link_arg.startswith('-fuse-ld')
+ linker = cross_c_link_arg.split('=')[1]
+ endif
+ endforeach
+ cross_args += ['CC=@0@'.format(cross_compiler), 'LD=ld.@0@'.format(linker)]