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.comm symbol, 0

Ian Lance Taylor ian@airs.com
Thu Nov 10 17:39:00 GMT 2005 
"Jan Beulich" <JBeulich@novell.com> writes:

> Is it correct that for ELF, as I would see at least as a reasonable
> option, this produces a 1-byte common symbol, but for COFF (maybe
> others) this produces an undefined extern? Shouldn't this be an error?
> 
> I'm asking because apparently only ELF sets the section for common
> symbols to bfd_com_section, others rely on the value of the symbol to be
> non-zero. If I want to finally resolve the symbol redefinition issues I
> need to also be able to detect common ones, and S_IS_COMMON (due to the
> fact just mentioned) doesn't reliably recognize them, nor are they
> recognizable through S_IS_DEFINED.

Shouldn't a zero-sized common symbol simply be an error?  What does it
mean?

Ian
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