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authorJakub Kicinski <jakub.kicinski@netronome.com>2018-06-28 14:41:35 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-07-01 01:01:50 +0200
commitc256429fbd01d6993a2e19ff24f252514a0b84a5 (patch)
treec1ffa7cad1baaa4f888aabf52318204d29867c46 /tools/bpf
parent509fda105ba8f9a1a5c6f8b79e4c7fc50b35c1e3 (diff)
downloadlinux-c256429fbd01d6993a2e19ff24f252514a0b84a5.tar.bz2
tools: bpftool: use correct make variable type to improve compilation time
Commit 4bfe3bd3cc35 ("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>
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index 892dbf095bff..0911b00b25cc 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -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)