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Message-ID: <20171220205332.GA28352@castle> Date: Wed, 20 Dec 2017 20:53:41 +0000 From: Roman Gushchin <guro@...com> To: Jakub Kicinski <jakub.kicinski@...ronome.com> CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <kernel-team@...com>, <scientist@...com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net> Subject: Re: [RFC PATCH net-next] tools/bpftool: use version from the kernel source tree On Wed, Dec 20, 2017 at 12:29:21PM -0800, Jakub Kicinski wrote: > On Wed, 20 Dec 2017 20:19:43 +0000, Roman Gushchin wrote: > > Bpftool determines it's own version based on the kernel > > version, which is picked from the linux/version.h header. > > > > It's strange to use the version of the installed kernel > > headers, and makes much more sense to use the version > > of the actual source tree, where bpftool sources are. > > > > This patch adds $(srctree)/usr/include to the list > > of include files, which causes bpftool to use the version > > from the source tree. > > > > Example: > > before: > > > > $ bpftool version > > bpftool v4.14.6 > > > > after: > > $ bpftool version > > bpftool v4.15.0 > > Thanks for the patch, this would indeed use some improvement. > > How about we just run make to get the version like liblockdep does? > > LIBLOCKDEP_VERSION=$(shell make --no-print-directory -sC ../../.. kernelversion) > > probably s@...../..@$(srctree)@ > > $(srctree)/usr/include is not going to be there for out-of-source builds. Hm, why it's better? It's not only about the kernel version, IMO it's generally better to use includes from the source tree, rather then system-wide installed kernel headers. I've got about out-of-source builds, but do we support it in general? How can I build bpftool outside of the kernel tree? I've tried a bit, but failed. Thank you!
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