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Date: Fri, 6 Nov 2009 17:12:32 +0100
Message-ID: <90baa01f0911060812q577ef471n9cf66a002330db3c@mail.gmail.com>
Subject: Re: small exe size increase from 1.7.0-62 to -63
From: Kai Tietz <ktietz70 AT googlemail DOT com>
To: cygwin AT cygwin DOT com
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2009/11/6 Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>:
> Corinna Vinschen wrote:
>>> Obviously 1.5K isn't much of a concern, but is this expected?
>>
>> It's a result of the new pseudo reloc v2 support. =A0Probably Chuck can
>> explain this better.
>
> I guess I should keep my reader in thread mode...I don't know what I
> could add to Corinna's explanation, except to say that all DLLs and EXEs
> include the startup code for runtime pseudo-relocs. =A0It now handles both
> v1 and v2 versions -- and the v2 version requires additional code
> (there's [some of] your 1.5k). Also, there is now actual error handling,
> so that's the WriteFile and various string handling imports. Finally, in
> both v1 and v2 mode, we now use the Virtual* functions to temporarily
> mark read-only pages writeable in order to update the relocs.
>
> This *should* make it possible -- **later** -- to reverse the current
> binutils behavior on cygwin when --enable-auto-import. =A0Right now, in
> that situation, binutils merges .rdata with .data, and marks .text
> writable, which is...less than ideal.

Right, I can't say here more about it. Maybe one point is here of some
interest about version 2 relocation, too. The DLLs/EXE files linking
via pseudo-relocations to an DLL having much smaller PE-headers. This
has positive side-effect on startup time and to size of the physical
application size. Btw upcoming binutils (cvs head version) is modified
already to use version 2 for x86 targets by default.

Cheers,
Kai


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