Re: Reducing the size of C++ executables - eliminating malloc

[Mark Mitchell <mark at codesourcery dot com>]

Michael Eager wrote:
> Mark Mitchell wrote:
>> Michael Eager wrote:
>>> Why should the personality routine be included in all C++ programs?
>>
>> Because all non-trivial, exceptions-enabled programs, may need to do
>> stack unwinding.
> 
> It would seem that the place to require the personality
> routine would be in the routine which causes the stack
> unwinding, not in every C++ object file, whether needed
> or not.

But, the way the ABI works requires a reference from each unit which may
cause unwinding.  Even if you lose the personality routine, you will
still have the exception tables, which themselves are a significant
cost.  If you don't want to pay for exceptions, you really have to
compile with -fno-exceptions.  In that case, certainly, we should be
able to avoid pulling in the personality routine.

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713