Very Computer

Hi all

Excuse the slightly misleading subject. A more accurate subject should
be "I've just upgraded to ELF and when I compile binaries, they're
_much_ bigger than their a.out counterparts".

For example, if I compile lsh, the a.out binary is 46,296 bytes, but
the ELF version is 191,420 bytes. Quite a difference!

Am I missing some compiler options here (-Wall -O2 -fmoit-frame-pointer -c)
are the ones I used)? How can I shrink ELF binaries?

Cheers
 M-J
-= Michael-John Turner -=-=-=-=-=-=-=-=-=-=-= UNIX: Live free or die -=-

: Hi all
:
: Excuse the slightly misleading subject. A more accurate subject should
: be "I've just upgraded to ELF and when I compile binaries, they're
: _much_ bigger than their a.out counterparts".
:
: For example, if I compile lsh, the a.out binary is 46,296 bytes, but
: the ELF version is 191,420 bytes. Quite a difference!
:
: Am I missing some compiler options here (-Wall -O2 -fmoit-frame-pointer -c)
: are the ones I used)? How can I shrink ELF binaries?
:

Sounds like they're getting compiled statically.

The new linker isn't quite as smart as the last one; it must have two links
for each shared library image, otherwise it'll compile static.

You'll need links like this for *all* shared libraries:

libc.so to libc.so.5
libc.so.5 to libc.so.5.2.18 (or whatever)

Hope that helps,
Jay

Quote:>: Excuse the slightly misleading subject. A more accurate subject should
>: be "I've just upgraded to ELF and when I compile binaries, they're
>: _much_ bigger than their a.out counterparts".
>:
>: For example, if I compile lsh, the a.out binary is 46,296 bytes, but
>: the ELF version is 191,420 bytes. Quite a difference!
>:
>: Am I missing some compiler options here (-Wall -O2 -fmoit-frame-pointer -c)
>: are the ones I used)? How can I shrink ELF binaries?
>:

     Maybe there is just more debugging info.  Did you strip the
executable?  eg.  

   strip myprogram

                        MARk.

:: Excuse the slightly misleading subject. A more accurate subject should
:: be "I've just upgraded to ELF and when I compile binaries, they're
:: _much_ bigger than their a.out counterparts".
:
:Sounds like they're getting compiled statically.
:
:The new linker isn't quite as smart as the last one; it must have two links
:for each shared library image, otherwise it'll compile static.
:
:You'll need links like this for *all* shared libraries:
:
:libc.so to libc.so.5
:libc.so.5 to libc.so.5.2.18 (or whatever)

Another thing that can cause this is if your libc.so link is in a
directory that is not searched until after the one containing an ELF
libc.a (or a link to one).  (I had been trying to arrange things so that
the 'trn' configuration script would work with my ELF system, and
suddenly every program I linked became *huge*.)

You can pass the "-Wl,--verbose" option through gcc to the loader to see
exactly where the loader is looking and what it finds.

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