Re: [Qemu-devel] [RFC PATCH 0/4] per-object libraries

[Paolo Bonzini]

Il 01/07/2013 12:10, Michael Tokarev ha scritto:
>>>> >>> Perhaps we can instead use something like
>>>>> >>>>
>>>>> >>>> common.o: $(patsubst %,../%, $(common-obj-y))
>>>>> >>>>      $(LD) -r -o $@ $^
>>>>> >>>>
>>>>> >>>> and then link common.o into the QEMU target.  Libtool can also be 
>>>>> >>>> used
>>>>> >>>> to abstract "ld -r".  Making libtool mandatory wouldn't be a problem 
>>>>> >>>> IMO
>>>>> >>>> (we'd need it anyway for modules) as long as you do not need libtool 
>>>>> >>>> to
>>>>> >>>> start QEMU or gdb from the build directory.
>>> >> I think this will mean that whole common.o will have to be linked
>>> >> into each executable which uses it, even if some executables are
>>> >> only using just one function from whole lot of .o files.
>> > 
>> > This would be a different common.o for each directory.
> Like util/common.o which requires -lrt and -lutil even if a given
> app does not use openpty() or timer_create() ?

No, for each target directory.

Paolo