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Am 01.08.2017 um 21:10 schrieb Eli Zaretskii (eliz AT gnu DOT org) [via 
djgpp AT delorie DOT com]:
>> Date: Tue, 01 Aug 2017 20:08:42 +0200
>> From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>

> Isn't it true that symbols that begin with an underscore are "reserved
> for the implementation", i.e. for the C library?  Or am I
> misremembering the C Standard?

You are probably misremembering it slightly, but in effect, you're 
correct.

Only names starting with _two_ underscores, or with an underscore 
followed by a capital, are unconditionally reserved for the 
implementation (which, in the case at hand, is DJGPP libc).  But for 
file-scope names (here: a declaration of _doprint() in a header file), 
names with just a single leading underscore are also reserved.

> If I'm right, then libiberty has no business declaring functions with
> such names.

That depends on the answer to the following question: what, exactly, is 
-liberty?  Is it supplying bits and pieces of the implementation that 
are missing in the underlying libc, or is it ordinary user code?  In the 
former case it would be allowed to declare a global _doprint, otherwise not.

It's been a while, but I seem to recall -liberty intended to be the former.