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What's All This about ELF? glibc?

See the ELF HOWTO by Daniel Barlow. Note that this is not the file
move-to-elf, which is a blow-by-blow account of how to upgrade to ELF

Linux has two different formats for executables, object files, and
object code libraries, known as, "ELF." (The old format is called
"a.out.") They have advantages, including better support for shared
libraries and dynamic linking.

Both a.out and ELF binaries can coexist on a system. However, they use
different shared C libraries, both of which have to be installed.

If you want to find out whether your system can run ELF binaries, look
in /lib for a file named, "libc.so.5." If it's there, you probably
have ELF libraries. If you want to know whether your installation
actually is ELF you can pick a representative program, like ls, and
run file on it:

-chiark:~> file /bin/ls
/bin/ls: Linux/i386 impure executable (OMAGIC) - stripped

valour:~> file /bin/ls
/bin/ls: ELF 32-bit LSB executable, Intel 80386, version 1, stripped

There is a patch to get 1.2.x to compile using the ELF compilers, and
produce ELF core dumps, at ftp://tsx-11.mit.edu/pub/packages/GCC/. You
do not need the patch merely to run ELF binaries. 1.3.x and later do
not need the patch at all.

The GNU glibc2 libraries are essentially more recent versions of ELF
libraries that follow most of the same processes for dynamic linking
and loading. Upgrade information is contained in ("How To Upgrade the
Libraries without Trashing the System.")

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