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Cc: Michael Elizabeth Chastain <mec.gnu@mindspring.com>,
        Robert Dewar <dewar@gnat.com>, gcc@gcc.gnu.org,
        Eyal Lebedinsky <eyal@eyal.emu.id.au>, Andreas Schwab <schwab@suse.de>
From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: (printf) ("hello world\n");
Date: Wed, 10 Dec 2003 14:17:00 -0000
To: "Joseph S. Myers" <jsm@polyomino.org.uk>
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On 10-dec-03, at 14:36, Joseph S. Myers wrote:
> On Wed, 10 Dec 2003, Segher Boessenkool wrote:
>> On 10-dec-03, at 13:27, Robert Dewar wrote:
>>> Is it really true that the name printf is reserved? Is a C program 
>>> not
>>> allowed to define its own printf function (which might or might not 
>>> be
>>> varargs)? What's the story here?
>>
>> It is reserved only in translation units that have stdio.h #include'd.
>
> It is reserved (in a hosted environment) as an identifier with external
> linkage regardless of what headers are included (7.1.3#1).

That does not prevent you from declaring and defining your own
printf() function (with a different prototype) though; it only requires
that you make that function have external linkage.


Segher