Re: DWARF2 problem with g++-3.0

[Daniel Berlin <dan at cgsoftware dot com>]

Daniel Berlin <dan@cgsoftware.com> writes:


> As Jason Merrill confirmed for me, for at least C and C++, we can
> eliminate any symbols with the same name, declared in the same line,
> of the same file.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
And before you worry, i've subsetted this elimination to only be
performed for symbols in include files, and turned off by default,
just to be on the safe side.
Even though the subsetting makes it exactly equivalent to the BINCL/EINCL optimization STABS
performs (in full form, you can generate pathological C code
that isn't strictly legal, but gcc will allow you to compile.  You
can't do the same for C++, but i didn't want to special case the
language). Literally. It will remove exactly the same symbols, hand verified.
It provably has to, anyway.  It's just an explicit form
of EINCL/BINCL optimization.
EINCL/BINCL tells you all the symbols in the include file for you.
We have to calculate it approriately (which isn't particularly
difficult, since we know which is the main source file for a CU, and
which are the include files.  And know what symbols go with what files. 
files).


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