[Bug gold/18147] New: gold should not issue relocation overflow error with --unresolved-symbols=ignore-all

[ian at airs dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18147

            Bug ID: 18147
           Summary: gold should not issue relocation overflow error with
                    --unresolved-symbols=ignore-all
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at google dot com
          Reporter: ian at airs dot com
                CC: ian at airs dot com

When linking a program with --unresolved-symbols=ignore-all, gold should not
issue a relocation overflow error for a reference to the symbol.

For example, this happens on 64-bit PowerPC.  foo.c:

void f1() { f2(); }

Compile that with a 64-bit PowerPC compiler

> ld foo.o:

foo.o(.text+0x14): error: relocation overflow
foo.o(.text+0x14): error: undefined reference to 'f2'

> ld foo.o --unresolved-symbols=ignore-all

foo.o(.text+0x14): error: relocation overflow

That last error shouldn't be issued.  We shouldn't report a relocation overflow
for a reference to an undefined symbol if we aren't going to report an error
about the undefined symbol.

Unfortunately there doesn't seem to be any one point to check.  Calls to
is_weak_undefined are a proxy, but I'm not sure that all the calls need to be
changed.

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