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Re: [PATCH] Fix unwinding through SA_ONSTACK signal frames on IA-64
>>>>> On Thu, 18 Dec 2003 15:24:44 -0500, Jakub Jelinek <jakub@redhat.com> said:
Jakub> 2) libgcc_s is linked to all C++ programs and shared
Jakub> libraries. Your libunwind+libgcc_s.so without unwind-ia64.o
Jakub> is uncomparably bigger than libgcc_s.so with unwind-ia64.o (4
Jakub> times bigger RE segments, 5 times bigger RW segment, 10 times
Jakub> more dynamic relocations).
That's not really a useful comparison. With the built-in unwinder,
you'll link against gcc_eh which will pull in code into the
executable, with all the size disadvantages and compatibility problems
that entails.
Furthermore, libunwind contains two versions of the source code: one
compiled for generic use and one for local-only unwinding. The
local-only version is used for GCC exception handling which is smaller
(and faster) and should have fewer dynamic relocs than the generic
version. Thus, your numbers are inflated by at least a factor of two.
If size/dynamic relocs is a primary concern, I'm sure it's something
that can be improved on even further (but like I said, I don't think
the situation is unreasonable at the moment).
--david