Jonathan Nieder <jrnieder@xxxxxxxxx> writes: > In this new tags/cscope example, one could make an argument that > running exactly once is similarly better than running as needed (as in > (ii) above), by pointing out that > > make tags TAGS cscope > > would have to check for a working "git ls-files" once instead of three > times. I tend to agree that once instead of three times is not such an improvement, especially given how cheap builtin-invocation of ls-files is, but then once every invocation of $(MAKE) would also be negligible (it is not once every internal target evaluation). In any case, here is what I'll queue. I like the fact that your suggestion avoids an extra "test invocation" that spends cycles to read the full index without contributing to the end result. By the way, did anybody know that "git ls-files >/dev/null" is more expensive than "git ls-files '~/' >/dev/null" as a way to see if there is ls-files command available? -- >8 -- Subject: [PATCH] Makefile: ask "ls-files" to list source files if available The [ce]tags and cscope targets used to run "find" looking for any paths that match '*.[chS]' to feed the list of source files to downstream xargs. Use "git ls-files" if it is already available to us, and otherwise use a tighter "find" expression that does not list directories and does not go into our .git directory. Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx> --- Makefile | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-) diff --git a/Makefile b/Makefile index 8d6d451..badfb77 100644 --- a/Makefile +++ b/Makefile @@ -2115,17 +2115,21 @@ po/git.pot: $(LOCALIZED_C) pot: po/git.pot +FIND_SOURCE_FILES = ( git ls-files '*.[hcS]' 2>/dev/null || \ + $(FIND) . \( -name .git -type d -prune \) \ + -o \( -name '*.[hcS]' -type f -print \) ) + $(ETAGS_TARGET): FORCE $(RM) $(ETAGS_TARGET) - $(FIND) . -name '*.[hcS]' -print | xargs etags -a -o $(ETAGS_TARGET) + $(FIND_SOURCE_FILES) | xargs etags -a -o $(ETAGS_TARGET) tags: FORCE $(RM) tags - $(FIND) . -name '*.[hcS]' -print | xargs ctags -a + $(FIND_SOURCE_FILES) | xargs ctags -a cscope: $(RM) cscope* - $(FIND) . -name '*.[hcS]' -print | xargs cscope -b + $(FIND_SOURCE_FILES) | xargs cscope -b ### Detect prefix changes TRACK_CFLAGS = $(CC):$(subst ','\'',$(ALL_CFLAGS)):\ -- 1.7.7.388.g3a4b7 -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html