tree 1ff8c31c9c769c289ccb28f5f0194d4c20c5f6ba
parent ef3128afeac7ad3dc0be5302b1f7ffad6756e9bb
author Brenden Blanco <bblanco@plumgrid.com> 1457422079 -0800
committer Brenden Blanco <bblanco@plumgrid.com> 1457422440 -0800

Add option to change kernel build search paths

Some linux distributions structure the /lib/modules directories
differently, causing complexities. Add cmake overrides to be able to
compile different behavior.

If your distro sets up `/lib/modules/$(uname -r)/{source,build}` with
header files split between the two (debian does this), then add
-DBCC_KERNEL_HAS_SOURCE_DIR=1 to the cmake command line.

If your distro just has something other than build/, but things are
still in one subdirectory, then add -DBCC_KERNEL_MODULES_SUFFIX=foo to
the cmake command line.

Also, fix one implicit declaration warning introduced by the new
bpf_get_stackid() helper.

Fixes: #397
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>