From: Eric Marsden <emars...@mail.dotcom.fr>
Subject: Re: compiling lisp files into executables..
Date: 1999/09/07
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>>>>> "bh" == Bruno Haible <hai...@clisp.cons.org> writes:

  [.interp section in ELF object files]
  
  bh> Yes, all ELF based Unices (Solaris, Linux, ...) implement it.
  bh> This feature is typically used for executing programs that were
  bh> compiled for other OSes, for example the iBCS package which
  bh> permits to run SVR4 binaries on Linux. Nowadays it is more used
  bh> to run Linux binaries on SVR4...

ok, thanks. For the curious, I investigated a little further. On
GNU/Linux with the GNU binutils:

    ~$ objdump -j .interp --full-contents `which ls` 
    /bin/ls:     file format elf32-i386
     
    Contents of section .interp:
     80480d4 2f6c6962 2f6c642d 6c696e75 782e736f  /lib/ld-linux.so
     80480e4 2e3200                               .2.

On Solaris:

    ~$ /usr/ccs/bin/dump -s -n .interp /bin/ls 
    /bin/ls:     
    .interp:
            2f 75 73 72 2f 6c 69 62 2f 6c 64 2e 73 6f 2e 31 00


  bh> But putting your own value there means that you will have to
  bh> take care of not removing the dynamic loading features provided
  bh> by the "normal" interpreter (/lib/ld-linux.so.2 on Linux).

ok, you'd have to chain in ld.so. But this seems to be an alternative
to the binfmt_misc module on linux[1], which allows you to associate
certain object types with an interpreter.

[1] <URL:http://www.kernelnotes.org/doc22/binfmt_misc.txt>

-- 
Eric Marsden
It's elephants all the way down