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From: Ben Hutchings <benh@debian.org>
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 <benh@debian.org>
---
--- 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))
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