netdev - Re: [PATCH bpf-next v2] tools/bpf: generate pkg-config file for libbpf

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Date:   Wed, 20 Mar 2019 13:30:13 +0000
From:   Luca Boccassi <bluca@...ian.org>
To:     Stanislav Fomichev <sdf@...ichev.me>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v2] tools/bpf: generate pkg-config file for
 libbpf

On Wed, 2019-03-20 at 13:22 +0000, Luca Boccassi wrote:
> On Tue, 2019-03-19 at 16:17 -0700, Stanislav Fomichev wrote:
> > On 03/19, Luca Boccassi wrote:
> > > Generate a libbpf.pc file at build time so that users can rely
> > > on pkg-config to find the library, its CFLAGS and LDFLAGS.
> > > 
> > > Signed-off-by: Luca Boccassi <bluca@...ian.org>
> > > ---
> > > v2: use QUIET_GEN instead of QUIET_LINK to generate pc file,
> > >     save kernel version in its own variable instead of calling
> > >     make inline
> > > 
> > >  tools/lib/bpf/.gitignore         |  1 +
> > >  tools/lib/bpf/Makefile           | 19 ++++++++++++++++---
> > >  tools/lib/bpf/libbpf.pc.template | 11 +++++++++++
> > >  3 files changed, 28 insertions(+), 3 deletions(-)
> > >  create mode 100644 tools/lib/bpf/libbpf.pc.template
> > > 
> > > diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
> > > index 4db74758c674..7d9e182a1f51 100644
> > > --- a/tools/lib/bpf/.gitignore
> > > +++ b/tools/lib/bpf/.gitignore
> > > @@ -1,3 +1,4 @@
> > >  libbpf_version.h
> > > +libbpf.pc
> > >  FEATURE-DUMP.libbpf
> > >  test_libbpf
> > > diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> > > index a05c43468bd0..1df3ebfb3118 100644
> > > --- a/tools/lib/bpf/Makefile
> > > +++ b/tools/lib/bpf/Makefile
> > > @@ -80,6 +80,7 @@ libdir_SQ = $(subst ','\'',$(libdir))
> > >  libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
> > >  
> > >  LIB_FILE = libbpf.a libbpf.so
> > > +PC_FILE = libbpf.pc
> > >  
> > >  VERSION		= $(BPF_VERSION)
> > >  PATCHLEVEL	= $(BPF_PATCHLEVEL)
> > > @@ -89,6 +90,7 @@ OBJ		= $@
> > >  N		=
> > >  
> > >  LIBBPF_VERSION =
> > > $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
> > > +KERNEL_VERSION = $(shell make --no-print-directory -sC ../../..
> > > kernelversion)
> > Oh, we do already have LIBBPF_VERSION, why not use that? This way
> > you don't need to do anything for out-of-tree libbpf from github.
> > 
> > I don't remember what was the strategy regarding libbpf versioning,
> > but
> > that 0.0.1 should be changed to something sensible (be set to the
> > kernel
> > version upon release?)
> 
> [re-sending as reply via phone added html and the list daemon said
> no-
> no]
> 
> That looks like the ABI version though, rather than the source
> version?
> The source version is more appropriate for the PC file

That said, the versioning looks looks like it could use some love and
it's not really a factor that should gate a pkg-config file and could
be done separately if required, so in v3 I've removed KERNEL_VERSION
and used LIBBPF_VERSION as you suggested.

Thanks for reviewing!

-- 
Kind regards,
Luca Boccassi