`make' compiles every files

`make' compiles every files

[Leo]

Hi all,

I just notice that even only just one file has been changed, `make' will
compile all the .el files. This looks like a waste.

Regards,
-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)

Re: `make' compiles every files

[Simon Josefsson]

Leo <sdl.web@gmail.com> writes:

> Hi all,
>
> I just notice that even only just one file has been changed, `make' will
> compile all the .el files. This looks like a waste.

If you changed, for example, a defmacro, other files that use the
macro needs to be recompiled.  I think there are other similar
cross-dependencies too.  If you know that what you changed does not
cause other files to be regenerated too, you can use the 'make clever'
target.

Re: `make' compiles every files

[Leo]

----- Simon Josefsson (2007-04-16) wrote:-----

>> I just notice that even only just one file has been changed, `make'
>> will compile all the .el files. This looks like a waste.
>
> If you changed, for example, a defmacro, other files that use the
> macro needs to be recompiled.

I am quite sure changing anything even it is not a defmacro triggers a
compile of all .el files, i.e. `make' in Gnus is not so smart.

> I think there are other similar cross-dependencies too.  If you know
> that what you changed does not cause other files to be regenerated
> too, you can use the 'make clever' target.

I am getting "make: *** No rule to make target `clever'.  Stop."

Thanks,
-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)

Re: `make' compiles every files

[Simon Josefsson]

Leo <sdl.web@gmail.com> writes:

> ----- Simon Josefsson (2007-04-16) wrote:-----
>
>>> I just notice that even only just one file has been changed, `make'
>>> will compile all the .el files. This looks like a waste.
>>
>> If you changed, for example, a defmacro, other files that use the
>> macro needs to be recompiled.
>
> I am quite sure changing anything even it is not a defmacro triggers a
> compile of all .el files, i.e. `make' in Gnus is not so smart.

Right, 'make' does not know that you didn't change a macro etc, so it
assumes the worst and rebuilds everything.

>> I think there are other similar cross-dependencies too.  If you know
>> that what you changed does not cause other files to be regenerated
>> too, you can use the 'make clever' target.
>
> I am getting "make: *** No rule to make target `clever'.  Stop."

Try 'cd lisp/'.  However, keep in mind that your Gnus build may be
broken if you use it (for the above reason).

/Simon

Re: `make' compiles every files

[Leo]

----- Simon Josefsson (2007-04-16) wrote:-----

>>> If you changed, for example, a defmacro, other files that use the
>>> macro needs to be recompiled.
>>
>> I am quite sure changing anything even it is not a defmacro triggers
>> a compile of all .el files, i.e. `make' in Gnus is not so smart.
>
> Right, 'make' does not know that you didn't change a macro etc, so it
> assumes the worst and rebuilds everything.

But `make' in emacs CVS knows how to deal with it ;) i.e. there is way
to improve this, isn't it?

-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)

Re: `make' compiles every files

[Simon Josefsson]

Leo <sdl.web@gmail.com> writes:

> ----- Simon Josefsson (2007-04-16) wrote:-----
>
>>>> If you changed, for example, a defmacro, other files that use the
>>>> macro needs to be recompiled.
>>>
>>> I am quite sure changing anything even it is not a defmacro triggers
>>> a compile of all .el files, i.e. `make' in Gnus is not so smart.
>>
>> Right, 'make' does not know that you didn't change a macro etc, so it
>> assumes the worst and rebuilds everything.
>
> But `make' in emacs CVS knows how to deal with it ;) i.e. there is way
> to improve this, isn't it?

Yes, probably.  Patches welcome. ;-)

Although I'm not sure if Emacs 'make' is actually clever enough to do
this properly.  Perhaps it just ignores this issue?  The motivation
might be that only developers do incremental builds, and they will
know how to debug things.  End-users only build it once.

/Simon