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Date: Thu, 19 Sep 2019 21:45:23 +0300 From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org> To: ast@...nel.org, daniel@...earbox.net, kafai@...com, andriin@...com Cc: yhs@...com, netdev@...r.kernel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH bpf] libbpf: fix version identification on busybox On Thu, Sep 19, 2019 at 07:05:18PM +0300, Ivan Khoronzhuk wrote: >It's very often for embedded to have stripped version of sort in >busybox, when no -V option present. It breaks build natively on target >board causing recursive loop. > >BusyBox v1.24.1 (2019-04-06 04:09:16 UTC) multi-call binary. \ >Usage: sort [-nrugMcszbdfimSTokt] [-o FILE] [-k \ >start[.offset][opts][,end[.offset][opts]] [-t CHAR] [FILE]... > >Lets modify command a little to avoid -V option. > >Fixes: dadb81d0afe732 ("libbpf: make libbpf.map source of truth for libbpf version") > >Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org> >--- > >Based on bpf/master > > tools/lib/bpf/Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > >diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile >index c6f94cffe06e..a12490ad6215 100644 >--- a/tools/lib/bpf/Makefile >+++ b/tools/lib/bpf/Makefile >@@ -3,7 +3,7 @@ > > LIBBPF_VERSION := $(shell \ > grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \ >- sort -rV | head -n1 | cut -d'_' -f2) >+ cut -d'_' -f2 | sort -r | head -n1) > LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION))) Also can be replaced a lidder harder, with: LIBBPFMAP := $(shell cat libbpf.map) LIBBPF_VERSIONS := $(sort $(patsubst %;,%,$(patsubst LIBBPF_%,%,$(filter LIBBPF_%, $(LIBBPFMAP))))) LIBBPF_VERSION := $(word $(words $(LIBBPF_VERSIONS)), $(LIBBPF_VERSIONS)) You choose, I'm not sure in "sort" of make the same on all systems. > > MAKEFLAGS += --no-print-directory >-- >2.17.1 > -- Regards, Ivan Khoronzhuk
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