About decimal floating point support

[Wu Zhou <woodzltc@cn.ibm.com>]

Hi Daniel,

We ever talked about adding decimal floating point into GDB.  And you 
provided a lot insightful suggestion for my first patch.  In my post at 
2005-10-18:
  http://sources.redhat.com/ml/gdb-patches/2005-10/msg00148.html
  http://sources.redhat.com/ml/gdb-patches/2005-10/msg00149.html

I revised the patch and the testcase. I believe it can address most of 
your concern.

But there is one concern not addressed: you ever proposed to move 
libdecnumber to the top level of the repository, and use that to implement 
DFP support in GDB.  At that time (Oct, 2005), DFP support for gcc is not 
matured yet.  The libdecnumber code may change itself.  So I didn't bother 
to adopt you method at that time and put my focus on resolving other 
problem you pointed out.  Now since DFP is already in the 4.2 development
tree of gcc.  So I guess it is time to revist this.

What is your current thought about this?  Do you still think it is more 
feasible to put libdecnumber at the top level repository?  I am now 
considering copy the code of libdecnumber (which is at the top level of 
gcc repository) to the top level of gdb repository. and use that to 
re-implment DFP support.  If the code of libdecnumber is changed, we can 
synchronize that to gdb repository.  Then gdb developers don't need to 
maintain these sensitive numeric code.

What do you think on this?  Your comments are highly appreciated!

Regards
- Wu Zhou