Overlinking in base

[Warner Losh]

On Nov 6, 2014, at 6:05 AM, Baptiste Daroussin <bapt at freebsd.org> wrote:

> On Wed, Nov 05, 2014 at 04:24:54PM -0800, Simon J. Gerraty wrote:
>> Baptiste Daroussin <bapt at freebsd.org> wrote:
>>> In the second case we could do it via make(1)
>>> LIBADD=	liba libc libc
>>> this will open something like a ${PATHTOTHELIB}/link.mk which will define
>>> DYNAMIC_ADD
>>> STATIC_ADD
>>> 
>>> And this could be recursive.
>> 
>> We do something like that in the Junos build
>> 
>> prog makefile might have DPLIBS+= ${LIBFOO}
>> which is exactly equivalent to
>> 
>> LDADD+= -lfoo
>> DPADD+= ${LIBFOO}
>> 
>> but ensures that they stay in sync (not so important now with meta
>> mode).
>> 
>> bsd.libnames.mk can then have
>> 
>> DPLIBS_libfoo += ${LIBGOO}
>> DPLIBS_libgoo += ${LIBZOO}
>> 
>> All of which is processed by dpadd.mk which you can find in
>> contrib/bmake/mk
>> Though dpadd.mk ignores DPLIBS_libgoo += ${LIBZOO} if LIBZOO has already
>> been added.
>> 
> I'am about to add something based on the following principle:
> https://people.freebsd.org/~bapt/plop.diff
> 
> With a bit more changes
> 
> The version I have now (a bit different from the patch now :)) allows multiple
> things:
> 
> 1/ simplify the Makefile for users:
> LIBADD= m archive util
> instead of
> DPADD= ${LIBM} ${LIBARCHIVE} ${LIBUTIL}
> LDADD= -lm -larchive -lutil
> 
> 2/ ensure dependencies are automatically tracked
> For example -lucl needs -lm adding LIBADD= ucl does the magic by itself
> 
> 3/ allow to build any single binary statically so far I'm able to build
> everything is bin sbin usr.bin and usr.sbin statically (which wasn't doable
> before)
> 
> 3/ hides the private/internal lib from the final user
> Do more need to say USEPRIVATELIB because I do use a libunbound it is automatic

Generally I like this.

One issue though about dependencies: Is there a tool to manage them? How do we know if things are wrong?
Will a simple buildworld always detect that, or do we need to do a buildworld with static linking?

Warner
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