add cscope target to Makefile

cscope is very nice for exploring the library and finding related
code. Let's support it by pre-building an index of all files.

1 files changed, 8 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index adb12c8..d427e1b 100644
--- a/Makefile
+++ b/Makefile
@@ -73,7 +73,7 @@ all     = lib ${rt-apps}
 rt-apps = cycles base_task rt_launch rtspin release_ts measure_syscall \
           base_mt_task runtests
 
-.PHONY: all lib clean dump-config TAGS tags
+.PHONY: all lib clean dump-config TAGS tags cscope
 
 all: ${all} inc/config.makefile
 
@@ -116,7 +116,7 @@ clean:
         rm -f *.o *.d *.a test_catalog.inc
         rm -f ${imported-headers}
         rm -f inc/config.makefile
-        rm -f tags TAGS
+        rm -f tags TAGS cscope.files cscope.out
 
 # Emacs Tags
 TAGS:
@@ -128,6 +128,12 @@ tags:
         @echo tags
         @find . -type f -and  -iname '*.[ch]' | xargs ctags
 
+# cscope DB
+cscope:
+        @echo cscope
+        @find . -type f -and  -iname '*.[ch]' | xargs printf "%s\n" > cscope.files
+        @cscope -b
+
 # ##############################################################################
 # Kernel headers.
 # The kernel does not like being #included directly, so let's