[Bug gold/18147] 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

--- Comment #4 from Ian Lance Taylor <ian at airs dot com> ---
We already explicitly do not report relocation errors for weak undefined
symbols.  That's because in those cases the relocation overflow is not
important.  And Cary is right: for any sort of undefined symbol, the relocation
overflow is not important.  What useful information is the linker conveying? 
I've already said that I don't care whether the symbol is undefined.  It
follows that any reference to that symbol can be expected to fail, and I don't
care.  If I'm going to run the program, I must be using some technique to avoid
executing that relocation at all.  There's no reason to think that I care about
a relocation overflow referring to that symbol any more than I care about any
other reference to that symbol.

This is not the case of --defsym SYM=0.  For that case we certainly should
report a relocation overflow.  This is a case where I've said I don't care
about the symbol at all.

(The particular use case here is a program that is determining the types of
symbols by linking against libraries that define those symbols and examining
the debug info.  The libraries can be passed as -l options and there is no need
for the tool to replicate the linker's search path.  There is also no need to
worry about the library dependencies, since they aren't relevant for the
purpose of the tool.  So it uses --unresolved-symbols=ignore-all.)

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