On Thursday 11 June 2009 16:59:32 Shlomi Fish wrote:
> Hi all!
>
> Based on the gcc-4.4.0 (with -Os) / x86-Linux shared library sizes here:
>
> http://tech.groups.yahoo.com/group/fc-solve-discuss/message/998
>
> And the Visual C++/Win32 (also x86) .dll sizes here:
>
> http://tech.groups.yahoo.com/group/fc-solve-discuss/message/999
>
> My question is: why are the Visual C++ generated binaries so much smaller
> than the equivalent Linux ones? Any insights would be appreciated.
>
Replying to myself, I'd like to note that I did the following test:
{{{{
shlomi:~$ cat test_shared_lib.c
int myzero()
{
return 0;
}
shlomi:~$ gcc -Os -o libtest.so -shared test_shared_lib.c
shlomi:~$ ls -l libtest.so
-rwxr-xr-x 1 shlomi shlomi 3768 2009-06-21 11:44 libtest.so
shlomi:~$ strip libtest.so
shlomi:~$ ls -l libtest.so
-rwxr-xr-x 1 shlomi shlomi 2448 2009-06-21 11:44 libtest.so
shlomi:~$
}}}}
So the overhead of having a mostly-empty shared library is 2,448 bytes (or
3,768 bytes before strip) which isn't very high, and doesn't explain why the
gcc-generated code is so much larger than the MSVC-generated one.
Regards,
Shlomi Fish
--
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Shlomi Fish http://www.shlomifish.org/
Funny Anti-Terrorism Story - http://xrl.us/bjn7t
God gave us two eyes and ten fingers so we will type five times as much as we
read.
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