Hi there,

now that the flamefest has died down, let's go back to technical problems.

As you know, I'm trying to get an ABI dump of libudev/libgudev as built
in the main Debian archive to ensure that the version built using eudev
will be ABI-compatible with it.

The reason is simple: avoid rebuilding every rdep of udev unless it's
strictly necessary.

Now for the nasty part: systemd's build system forces Link-Time
Optimization on its ELF files, and this confuses abi-dumper to the point
that it believes that eu-readelf found no symbol table nor DWARF
sections (which isn't true, since everything is built with -g and the
libraries have the proper .gnu_debuglink section header).

This is where I need help from Perl wizards: abi-dumper is a big lump of
Perl, and saying that I hate Perl is an understatement :-)

I'm not asking to fix it for me (even though that would be appreciated
*wink* *wink*), but I humbly ask for an high level overview of how it
uses eu-readelf, vtable-dumper et al. to produce an ABI profile for the
shared object, so I can try to understand what part of LTO is confusing it.

You can use libudev.so.1.5.0 as your test case, just make sure to
install systemd-dbg (otherwise it would rightfully complain that
debugging symbols are missing).

Kind regards,
--
Matteo Panella