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From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: Felipe Contreras <felipe.contreras@gmail.com>,
	Vincent van Ravesteijn <vfr@lyx.org>,
	John Keeping <john@keeping.me.uk>,
	Ramkumar Ramachandra <artagnon@gmail.com>,
	git@vger.kernel.org, Jonathan Nieder <jrnieder@gmail.com>,
	Duy Nguyen <pclouds@gmail.com>
Subject: Re: [PATCH] build: get rid of the notion of a git library
Date: Mon, 10 Jun 2013 16:41:37 -0700	[thread overview]
Message-ID: <7v8v2hedou.fsf@alter.siamese.dyndns.org> (raw)
In-Reply-To: <7vk3m1efda.fsf@alter.siamese.dyndns.org> (Junio C. Hamano's message of "Mon, 10 Jun 2013 16:05:21 -0700")

Junio C Hamano <gitster@pobox.com> writes:

> Jeff King <peff@peff.net> writes:
>
>> My general impression of the goal of our current code organization is:
>>
>>   1. builtin/*.c should each contain a single builtin command and its
>>      supporting static functions. Each file gets linked into git.o to
>>      make the "main" git executable.
>
> Correct; that is what we aimed for when we made builtin-*.c (later
> moved to builtin/*.c).  Some builtin/*.c files can contain more than
> one cmd_foo implementations, so "single" is not a solid rule, and it
> does not have to be, because all of them are expected to be linked
> into the main binary together with git.c to be called from main().
>
> And as you hinted, if some global data or functions in it turns out
> to be useful for standalone binaries, their definitions must migrate
> out of buitlin/*.c to ./*.c files, because standalone binaries with
> their own main() definition cannot be linked with builtin/*.o, the
> latter of which requires to be linked with git.o with its own main().
> ...
> The rationale behind libgit.a was so that make targets for the
> standalone binaries (note: all of them were standalone in the
> beginning) do not have to list *.o files that each of them needs to
> be linked with.  It was primary done as a convenient way to have the
> linker figure out the dependency and link only what was needed.

For the particular case of trying to make sequencer.o, which does
not currently have dependencies on builtin/*.o, depend on something
that is in builtin/notes.o, the link phase of standalone that wants
anything from revision.o (which is pretty much everything ;-) goes
like this:

        upload-pack.c   wants handle_revision_opt etc.
        revision.c      provides handle_revision_opt
                        wants name_decoration etc.
        log-tree.c      provides name_decoration
                        wants append_signoff
        sequencer.c     provides append_signoff

So sequencer.o _is_ meant to be usable from standalone and belongs
to libgit.a

If sequencer.o wants to call init_copy_notes_for_rewrite() and its
friends [*1*] that are currently in builtin/notes.o, first the
called function(s) should be moved outside builtin/notes.o to
notes.o or somewhere more library-ish place to be included in
libgit.a, which is meant to be usable from standalone.


[Footnote]

*1* ... which is a very reasonable thing to do.  But moving
    sequencer.o to builtin/sequencer.o is *not* the way to do this.

  reply	other threads:[~2013-06-10 23:41 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-08 17:29 [PATCH] build: get rid of the notion of a git library Felipe Contreras
2013-06-08 18:02 ` Ramkumar Ramachandra
2013-06-08 18:22   ` Felipe Contreras
2013-06-09 14:56     ` Ramkumar Ramachandra
2013-06-09 15:12       ` John Keeping
2013-06-09 15:40         ` Felipe Contreras
2013-06-09 16:02           ` John Keeping
2013-06-09 16:22             ` Felipe Contreras
2013-06-09 16:42               ` John Keeping
2013-06-09 17:03                 ` Ramkumar Ramachandra
2013-06-09 17:12                   ` Ramkumar Ramachandra
2013-06-09 17:13                   ` Felipe Contreras
2013-06-09 17:32                     ` John Keeping
2013-06-09 17:45                       ` Felipe Contreras
2013-06-09 16:36             ` Ramkumar Ramachandra
2013-06-09 17:30           ` Vincent van Ravesteijn
2013-06-09 17:35             ` Felipe Contreras
2013-06-10 21:45             ` Jeff King
2013-06-10 21:52               ` Felipe Contreras
2013-06-10 22:06                 ` Jeff King
2013-06-10 22:22                   ` Felipe Contreras
2013-06-10 23:05                   ` Junio C Hamano
2013-06-10 23:41                     ` Junio C Hamano [this message]
2013-06-10 23:51                       ` Felipe Contreras
2013-06-11  0:04                         ` Junio C Hamano
2013-06-11  1:53                           ` Junio C Hamano
2013-06-11  4:15                             ` Felipe Contreras
2013-06-11 17:33                               ` Junio C Hamano
2013-06-11 17:41                                 ` Felipe Contreras
2013-06-11 17:58                                   ` Junio C Hamano
2013-06-11 18:06                                     ` Felipe Contreras
2013-06-11 18:14                                       ` Linus Torvalds
2013-06-11 19:15                                         ` Felipe Contreras
2013-06-11 19:59                                         ` Junio C Hamano
2013-06-11 20:12                                           ` Felipe Contreras
2013-06-12  0:12                                           ` [PATCH 0/3] Refactor useful notes functions into notes-utils.[ch] Johan Herland
2013-06-12  0:12                                             ` [PATCH 1/3] finish_copy_notes_for_rewrite(): Let caller provide commit message Johan Herland
2013-06-12 17:27                                               ` Junio C Hamano
2013-06-12  0:13                                             ` [PATCH 2/3] Move copy_note_for_rewrite + friends from builtin/notes.c to notes-utils.c Johan Herland
2013-06-12  0:32                                               ` Felipe Contreras
2013-06-12  7:10                                                 ` Johan Herland
2013-06-12 18:28                                                   ` Felipe Contreras
2013-06-12 19:14                                                     ` Johan Herland
2013-06-12 19:18                                                       ` Felipe Contreras
2013-06-13  6:45                                                     ` Andreas Krey
2013-06-13 13:13                                                       ` Felipe Contreras
2013-06-12 20:02                                               ` Junio C Hamano
2013-06-12  0:13                                             ` [PATCH 3/3] Move create_notes_commit() from notes-merge.c into notes-utils.c Johan Herland
2013-06-12 20:02                                             ` [PATCH 0/3] Refactor useful notes functions into notes-utils.[ch] Junio C Hamano
2013-06-12 20:11                                               ` Felipe Contreras
2013-06-13 17:24                                                 ` Junio C Hamano
2013-06-13 18:16                                                   ` Felipe Contreras
2013-06-13 18:50                                                     ` Felipe Contreras
2013-06-11 18:17                                       ` [PATCH] build: get rid of the notion of a git library Junio C Hamano
2013-06-11 19:01                                         ` Felipe Contreras
2013-06-11 19:24                                           ` Junio C Hamano
2013-06-11 19:49                                             ` Felipe Contreras
2013-06-11  4:04                           ` Felipe Contreras
2013-06-09 15:41       ` Felipe Contreras

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