Re: [PATCH] Makefile: Fix cscope issues on MacOS and soft links

[Peter Xu]

Hi, Alex,

On Tue, Aug 03, 2021 at 11:18:36PM +0100, Alex Bennée wrote:
> 
> Peter Xu <peterx@redhat.com> writes:
> 
> > This patch fixes actually two issues with 'make cscope'.
> >
> > Firstly, it fixes the command for MacOS "find" command as MacOS will append 
> > the
> > full path of "$(SRC_PATH)/" before each found entry, then after the final 
> > "./"
> > replacement trick it'll look like (e.g., "qapi/qmp-dispatch.c"):
> >
> >   /qapi/qmp-dispatch.c
> >
> > Which will point to the root directory instead.
> >
> > Fix it by simply remove the "/" in "$(SRC_PATH)/" of "find-src-path", then
> > it'll work for at least both Linux and MacOS.
> >
> > The other OS-independent issue is to start proactively ignoring soft links 
> > when
> > generating tags, otherwise by default on master branch we'll see this error
> > when "make cscope":
> >
> > cscope: cannot find file subprojects/libvhost-user/include/atomic.h
> >
> > This patch should fix the two issues altogether.
> >
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> > ---
> >  Makefile | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 401c623a65..5562a9b464 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -229,7 +229,8 @@ distclean: clean
> >     rm -f linux-headers/asm
> >     rm -Rf .sdk
> >  
> > -find-src-path = find "$(SRC_PATH)/" -path "$(SRC_PATH)/meson" -prune -o \( 
> > -name "*.[chsS]" -o -name "*.[ch].inc" \)
> > +find-src-path = find "$(SRC_PATH)" -path "$(SRC_PATH)/meson" -prune -o \
> > +   -type l -prune -o \( -name "*.[chsS]" -o -name "*.[ch].inc" \)
> 
> The second half of the change causes my "make gtags" to descend down
> build directories and complain about unindexed files.

Would this help?

---8<---
diff --git a/Makefile b/Makefile
index 5562a9b464..eeb21f0e6a 100644
--- a/Makefile
+++ b/Makefile
@@ -251,7 +251,7 @@ gtags:
                "GTAGS", "Remove old $@ files")
        $(call quiet-command,                           \
                (cd $(SRC_PATH) &&                      \
-                $(find-src-path) | gtags -f -),        \
+                $(find-src-path) -print | gtags -f -), \
                "GTAGS", "Re-index $(SRC_PATH)")
 
 .PHONY: TAGS
---8<---

For some reason, "make gtags" didn't use "-print" as the last expression.  My
understanding is when expression is not specified, then it's default will be
"-print".  However for some reason it acts like that when "-print" is not there
all the "-prone" expressions are not really behaving.  Above does work for me,
but frankly I don't really know enough on how "find" works here.

If you agree, I can repost a v2 with that squashed.

Thanks,

-- 
Peter Xu