[Bug binutils/12549] --as-needed should ignore weak references

[bugdal at aerifal dot cx]

http://sourceware.org/bugzilla/show_bug.cgi?id=12549

--- Comment #9 from Rich Felker <bugdal at aerifal dot cx> 2013-01-14 15:50:47 
UTC ---
I agree there's room for different opinions here, but I believe --as-needed
should not include the library when all it does is resolve weak references.
This matches the static-linking behavior and, perhaps more importantly, matches
the purpose of making the reference weak: the fact that you don't need or want
the actual implementation linked in unless you're also linking something else
that depended on it being present.

If it's not acceptable for --as-needed to have this behavior, then a different
option to achieve the same thing is needed, and gcc needs to use that option
with libgcc_s to prevent it from being linked unconditionally.

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