C++ and debugger for SVR4 (386/486)?

[Michael L. Kornegay]

I am looking for a good implementation of C++ with source level
debugger for Intel 386/486 based SVR4 implemetations.

We have kludged the Glockenspeil SVR3 compiler to work and have
AT&T's CFront, but debugging is using sdb (and a real pain).

Anyone know of any other possibilities with C++ source level
debugging?  

Dont tell me about SVR3 C++ implementations, most will not work 
because they mess with the object files to allow linking of static 
objects, and obviously debuggers need to mess with object files 
(SVR3 uses COFF format, SVR4 used ELF format).

Thanks,
-- 
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Michael L. Kornegay,
  michael.kornegay at columbia.ncr.com, or
  mlk at bir.com, and mlk at bir.uucp