[PATCH bpf-next] libbpf: Add cscope and TAGS targets to Makefile

["Toke Høiland-Jørgensen" <toke@redhat.com>]

Using cscope and/or TAGS files for navigating the source code is useful.
Add simple targets to the Makefile to generate the index files for both
tools.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 tools/lib/bpf/.gitignore |  2 ++
 tools/lib/bpf/Makefile   | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
index d9e9dec04605..c1057c01223e 100644
--- a/tools/lib/bpf/.gitignore
+++ b/tools/lib/bpf/.gitignore
@@ -3,3 +3,5 @@ libbpf.pc
 FEATURE-DUMP.libbpf
 test_libbpf
 libbpf.so.*
+TAGS
+cscope.*
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index c6f94cffe06e..57df6b933196 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -262,7 +262,7 @@ clean:
 
 
 
-PHONY += force elfdep bpfdep
+PHONY += force elfdep bpfdep cscope TAGS
 force:
 
 elfdep:
@@ -271,6 +271,14 @@ elfdep:
 bpfdep:
 	@if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
 
+cscope:
+	(echo \-k; echo \-q; for f in *.c *.h; do echo $$f; done) > cscope.files
+	cscope -b -f cscope.out
+
+TAGS:
+	rm -f TAGS
+	echo *.c *.h | xargs etags -a
+
 # Declare the contents of the .PHONY variable as phony.  We keep that
 # information in a variable so we can use it in if_changed and friends.
 .PHONY: $(PHONY)
-- 
2.23.0