kni: fix build on Linux < 3.14

[dpdk.git] / kernel / linux / meson.build

diff --git a/kernel/linux/meson.build b/kernel/linux/meson.build
index a5b88f0..5b7ec06 100644 (file)
--- a/kernel/linux/meson.build
+++ b/kernel/linux/meson.build
@@ -1,8 +1,42 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Intel Corporation
 
-subdirs = ['igb_uio']
+subdirs = ['igb_uio', 'kni']
 
-foreach d:subdirs
-       subdir(d)
-endforeach
+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
+else
+
+       kernel_dir = get_option('kernel_dir')
+       if kernel_dir == ''
+               # use default path for native builds
+               kernel_version = run_command('uname', '-r').stdout().strip()
+               kernel_dir = '/lib/modules/' + kernel_version + '/build'
+       endif
+
+       # test running make in kernel directory, using "make kernelversion"
+       make_returncode = run_command('make', '-sC', kernel_dir,
+                       'kernelversion').returncode()
+       if make_returncode != 0
+               if meson.version().version_compare('>=0.44')
+                       warning(WARN_NO_HEADERS)
+               else
+                       message('WARNING: ' + WARN_NO_HEADERS)
+               endif
+       else # returncode == 0
+
+# DO ACTUAL MODULE BUILDING
+               foreach d:subdirs
+                       subdir(d)
+               endforeach
+       endif
+endif