Howto re-compile ony parts?

[Andrew Haley]

Martin Buchholz wrote:
> Unfortunately, incremental builds by running make in subdirectories
> have historically been quite unreliable, and it has never been highest priority
> to fix them.  Developers often do (at least in the jdk repository)
> - try incremental build; it might work...
> - else back off to rebuilding everything;
>   cd jdk/make; make clobber all
> 
> You could try to fix all of the subdirectory makefiles, but that's an
> enormous job.
> For bonus points, you could try to fix the architecture of the
> recursive makes themselves
> using the ideas in "Recursive Make Considered Harmful"
> http://miller.emu.id.au/pmiller/books/rmch/

Mmm.  Surely if anyone is going to hack on the makefiles the first thing
to do is to fix the dependencies so that "make -j" works properly.

Andrew.