kbuild: Add ctags support for function prototypes and external variable declarations

This patch adds function prototypes and external variable declarations
to the set of tag kinds when running ctags. I find this useful when
perusing the kernel. Please apply.

Signed-off-by: John Kacur <jkacur@rogers.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index 5f685b989165..ced03463ba5d 100644
--- a/Makefile
+++ b/Makefile
@@ -1236,8 +1236,10 @@ cscope: FORCE
 quiet_cmd_TAGS = MAKE   $@
 define cmd_TAGS
         rm -f $@; \
-        ETAGSF=`etags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
-        $(all-sources) | xargs etags $$ETAGSF -a
+        ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
+                echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
+                --extra=+f --c-kinds=+px"`; \
+                $(all-sources) | xargs etags $$ETAGSF -a
 endef
 
 TAGS: FORCE
@@ -1247,8 +1249,10 @@ TAGS: FORCE
 quiet_cmd_tags = MAKE   $@
 define cmd_tags
         rm -f $@; \
-        CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
-        $(all-sources) | xargs ctags $$CTAGSF -a
+        CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
+                echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
+                --extra=+f --c-kinds=+px"`; \
+                $(all-sources) | xargs ctags $$CTAGSF -a
 endef
 
 tags: FORCE