[Bug gold/28871] New: gold: --no-define-common is incompatible with GNU ld

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=28871

            Bug ID: 28871
           Summary: gold: --no-define-common is incompatible with GNU ld
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: i at maskray dot me
                CC: ian at airs dot com
  Target Milestone: ---

In 2001-09, [optionally postpone assignment of
Common](https://sourceware.org/pipermail/binutils/2001-September/014015.html)
added --no-define-common to be used with -shared. --define-common is not
implemented.
Here is my understanding: glibc around 2.1.3 used to have a ld.so bug that the
ELF interposition might not work. Using --no-define-common with shared objects
can make COMMON symbols undefined and circumvent the bug.

gold confuses --define-common with -d/FORCE_COMMON_ALLOCATION (commit
0dfbdef4c43cfe12bb3e2505ebe5acc651a35c98) and implements --define-common with
-d semantics. Its --no-define-common is incompatible with GNU ld.

I suggest that gold removes --[no-]define-common. Debian Code Search says no
project uses this option.

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