[PATCH v2 00/18] resurrect automatic dependencies

[Tom Tromey]

This is a refresh of my series to resurrect automatic dependency
tracking.  v1 was posted here:

    http://gcc.gnu.org/ml/gcc-patches/2013-07/msg01218.html

Compared to v1:

* I ran the "hanging test" using GNU make 3.81 on each revision, as
  detailed:

    http://gcc.gnu.org/ml/gcc-patches/2013-07/msg01267.html

* I introduced a POSTCOMPILE step.  This helps cope with dependency
  issues if gcc is interrupted.  See:

    http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35697

  This came up during review of the original patch, ages ago.

* I've rebased a few times so that it applies to current trunk.


Ok?

Tom