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tools: bpftool: use correct make variable type to improve compilation time 

Commit 4bfe3bd3cc ("tools/bpftool: use version from the kernel
source tree") added version to bpftool.  The version used is
equal to the kernel version and obtained by running make kernelversion
against kernel source tree.  Version is then communicated
to the sources with a command line define set in CFLAGS.

Use a simply expanded variable for the version, otherwise the
recursive make will run every time CFLAGS are used.

This brings the single-job compilation time for me from almost
16 sec down to less than 4 sec.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-06-28 14:41:35 -07:00 committed by Daniel Borkmann
parent 509fda105b
commit c256429fbd
1 changed files with 1 additions and 1 deletions
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2
tools/bpf/bpftool/Makefile
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@ -23,7 +23,7 @@ endif
LIBBPF = $(BPF_PATH)libbpf.a
BPFTOOL_VERSION=$(shell make --no-print-directory -sC ../../.. kernelversion)
BPFTOOL_VERSION := $(shell make --no-print-directory -sC ../../.. kernelversion)
$(LIBBPF): FORCE
$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(OUTPUT) $(OUTPUT)libbpf.a FEATURES_DUMP=$(FEATURE_DUMP_EXPORT)