[systemd-bugs] [Bug 86666] New: Use of gold linker breaks debugging

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86666

            Bug ID: 86666
           Summary: Use of gold linker breaks debugging
           Product: systemd
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: peter at lekensteyn.nl
        QA Contact: systemd-bugs at lists.freedesktop.org

Among the problems that the gold linker brings:

 - The debugging section gets dropped, making the /usr/lib/debug/ files
   useless.
 - The .eh_frame section is bogus[1], resulting in crashes in
   libunwind[2] and a truncated backtrace in gdb.

The issue "fixed" in that commit is gone as IFUNC is not used anymore
since version 210), so in theory we could drop the -Wl,-fuse-ld=gold
line...

...but in practice we run into problems because GNU ld sees that
symbols appear twice, once in the libsystemd-{internal,shared}.la,
and once in the compatibility library (libsystemd-id128.la).

I tried to remove libsystemd-internal.la from libsystemd_id128_LIBADD,
but then all symbols would disappear, leaving a pretty empty
libsystemd-id128.so file. (This presumably happens because there were
missing references.)

Now I would like to revert to the state before v208-1653-g39c4ead,
but meanwhile there have been a lot of other changes to the build system.
What would it take to avoid linking two archives with the same symbol?
That would also avoid problems such as
https://sourceware.org/bugzilla/show_bug.cgi?id=16504
since then there would only be one symbol.

 [1]: https://sourceware.org/bugzilla/show_bug.cgi?id=17639
 [2]:
http://lists.nongnu.org/archive/html/libunwind-devel/2014-11/msg00009.html

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