netdev - Re: [PATCH bpf-next] libbpf: make libbpf.map source of truth for libbpf version

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Date:   Tue, 13 Aug 2019 17:51:15 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>, <andrii.nakryiko@...il.com>,
        <kernel-team@...com>, Andrey Ignatov <rdna@...com>
Subject: Re: [PATCH bpf-next] libbpf: make libbpf.map source of truth for
 libbpf version

On Tue, 13 Aug 2019 16:24:08 -0700, Andrii Nakryiko wrote:
> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> index 9312066a1ae3..d9afc8509725 100644
> --- a/tools/lib/bpf/Makefile
> +++ b/tools/lib/bpf/Makefile
> @@ -1,9 +1,10 @@
>  # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
>  # Most of this file is copied from tools/lib/traceevent/Makefile
>  
> -BPF_VERSION = 0
> -BPF_PATCHLEVEL = 0
> -BPF_EXTRAVERSION = 4
> +BPF_FULL_VERSION = $(shell \
> +	grep -E 'LIBBPF_([0-9]+)\.([0-9]+)\.([0-9]+) \{' libbpf.map | \
> +	tail -n1 | cut -d'_' -f2 | cut -d' ' -f1)
> +BPF_VERSION = $(firstword $(subst ., ,$(BPF_FULL_VERSION)))
>  
>  MAKEFLAGS += --no-print-directory
>  
> @@ -79,15 +80,12 @@ export prefix libdir src obj
>  libdir_SQ = $(subst ','\'',$(libdir))
>  libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
>  
> +LIBBPF_VERSION	= $(BPF_FULL_VERSION)

Perhaps better use immediate set here ':='? 
I'm not sure how many times this gets evaluated, but it shouldn't
really change either..

>  VERSION		= $(BPF_VERSION)
> -PATCHLEVEL	= $(BPF_PATCHLEVEL)
> -EXTRAVERSION	= $(BPF_EXTRAVERSION)
>  
>  OBJ		= $@
>  N		=
>  
> -LIBBPF_VERSION	= $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
> -
>  LIB_TARGET	= libbpf.a libbpf.so.$(LIBBPF_VERSION)
>  LIB_FILE	= libbpf.a libbpf.so*
>  PC_FILE		= libbpf.pc