Linking to libraries in the ELF?

[Maxime Devos]

Hi guilers,

I've got this crazy idea a few days ago, about the FFI interface.
When a program written in C is compiled with some shared libraries,
these libraries are referred to in special [insert ELF terminology
here] of the binary.  I wonder if it would be reasonable and feasible
to do something similar for compiles guile modules?

C example:
$ readelf -d `which guile`

  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libguile-3.0.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libgc.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libffi.so.7]
 [snip]
 0x000000000000001d (RUNPATH)            Library runpath: [[snip]]
 [snip]

Hypothetical Scheme example:
$ readelf -d 
$HOME/.guix-profile/lib/guile/3.0/site-ccache/chickadee/audio/vorbis.go

  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libvorbisfile.so.3]
 0x000000000000001d (RUNPATH)            Library runpath: [[snip]]
 0x0000000037146003 (<unknown>: 37146003) 0x3000002
 0x0000000037146002 (<unknown>: 37146002) 0xe8
 0x0000000037146000 (<unknown>: 37146000) 0x20000
 0x0000000037146001 (<unknown>: 37146001) 0xaaa0
 0x000000000000000c (INIT)               0x6bd0
 0x0000000037146004 (<unknown>: 37146004) 0x15530
 0x0000000000000000 (NULL)               0x0

This would require fleshing out some details though,
such as when to use RUNPATH and when not, cross-platform support,
where to find the libraries, some things I probably forgot.

WDYT?

Maxime

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