From: Ben Hutchings Date: Fri, 14 Aug 2020 00:43:54 +0100 Subject: bpftool: Fix version string in recursive builds Forwarded: https://lore.kernel.org/bpf/20200813235837.GA497088@decadent.org.uk/T/#u When bpftool is built as part of a Debian package build, which itself uses make, "bpftool version" shows: bpftool vmake[4]: Entering directory /build/linux-5.8/tools/bpf/bpftool 5.8.8.0 make[4]: Leaving directory /build/linux-5.8 Although we pass the "--no-print-directory" option, this is overridden by the environment variable "MAKEFLAGS=w". Clear MAKEFLAGS for the "make kernelversion" command. I have no explanation for the doubled ".8" in the version string, but this seems to fix that as well. Signed-off-by: Ben Hutchings --- --- a/tools/bpf/bpftool/Makefile +++ b/tools/bpf/bpftool/Makefile @@ -25,7 +25,7 @@ endif LIBBPF = $(LIBBPF_PATH)libbpf.a -BPFTOOL_VERSION ?= $(shell make -rR --no-print-directory -sC ../../.. kernelversion) +BPFTOOL_VERSION ?= $(shell MAKEFLAGS= make -rR --no-print-directory -sC ../../.. kernelversion) $(LIBBPF): FORCE $(if $(LIBBPF_OUTPUT),@mkdir -p $(LIBBPF_OUTPUT))