[LLVMdev] strace for whole-program bitcodes

[zhunan]

Hi,

I don't think just use gold-plugin even modified is enough for the task
of building a whole-program bc file.

When we want to build a whole-program bc file by a general solution(I
meant that we can use such a method for all kinds of build system),we
need not only a gold-plugin to do what llvm-ld does,but also some
mechanisms,not a simple trick to modify the env variables,to run
ar,ld,ranlib's llvm-counterparts when building.

A wrapper which can wraps cc1,ld,ar,ranlib may archieve it..

Nan