[Bug gold/21074] New: [2.28 Regression] bfd ld stumbles over duplicated symbols generated by gold

[doko at debian dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21074

            Bug ID: 21074
           Summary: [2.28 Regression] bfd ld stumbles over duplicated
                    symbols generated by gold
           Product: binutils
           Version: 2.28
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: doko at debian dot org
                CC: ian at airs dot com
  Target Milestone: ---

[forwarded from https://bugs.debian.org/852035]

"""
When the gold linker is used, it sometimes generates duplicated symbols.
It's not something new, and can be seen for example in
qtbase-opensource-src 5.7.1+dfsg-2:

  1081: 00000000004caf88     0 NOTYPE  GLOBAL DEFAULT ABS address@hidden
  1082: 00000000004caf88     0 NOTYPE  GLOBAL DEFAULT ABS address@hidden

Note that bfd doesn't generate duplicated with the same command line
beside the -fuse-ld=gold. This used to not be a problem with both gold
and bfd. However the upstream commit eb3908448b , which first appeared
in binutils 2.27.51.20161231-1, causes this symbols to become
relocatable. This can be seen in qtbase-opensource-src 5.7.1+dfsg-3:

  1081: 00000000004caf88     0 NOTYPE  GLOBAL DEFAULT 19 address@hidden
  1082: 00000000004caf88     0 NOTYPE  GLOBAL DEFAULT 19 address@hidden

This in turn causes bfd to fail to link binaries against libQt5Core.so
or libQt5Gui.so, for example when building libqapt (see [1] for a full
build log):

  /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.7.1:(*IND*+0x0): multiple definition
of `__bss_start'
  /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.7.1:(*IND*+0x0): multiple definition
of `_edata'
  /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.7.1:(*IND*+0x0): multiple definition
of `_end'
  /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.7.1:(*IND*+0x0): multiple
definition of `__bss_start'
  /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.7.1:(*IND*+0x0): multiple
definition of `__bss_start'
  /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.7.1:(*IND*+0x0): multiple
definition of `_edata'
  /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.7.1:(*IND*+0x0): multiple
definition of `_edata'
  /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.7.1:(*IND*+0x0): multiple
definition of `_end'
  /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.7.1:(*IND*+0x0): multiple
definition of `_end'

Note however that having duplicated symbols doesn't cause a problem to
gold, only to bfd.

I don't really know how this should be fixed, either bfd should accept
duplicated symbols, or gold should stop generating them.
"""

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