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In-reply-to: <m4ect01p964inq4g0pb0dtk3u90p4e3mn2@4ax.com> (message from Brian
	Inglis on Fri, 31 Dec 2004 23:01:02 -0700)
Subject: Re: More complaints from tests/libclink/check
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> Date: Fri, 31 Dec 2004 23:01:02 -0700
> From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
> 
> >You just define your (POSIX) functions that does the real work, adding
> >them as stubs to <libc/stubs.h> and letting the C (89 or 99) call them
> >as necessary.
> 
> I am not sure what you mean by stubs here? 

See src/libc/stubs/mkstubs.c.  This program is invoked during the
library build; it scans the libc/stubs.h header and for each stub
there produces a stubNN.S file that defines a function which simply
jmp's to its alias.  Thus, e.g., localtime_r will simply jmp to
localtime.  The resulting stubNN.S files are then assembled and linked
into libc.a.

> If the POSIX functions are not declared by including the appropriate
> header, or by calling them with a local declaration in scope, or if
> compiler options specify -ansi, we should not pollute the ISO Standard
> C namespace. 

The stub method solves this problem, as you only get localtime_r
linked in if you reference it in your program.

The question is, as I wrote elsewhere in this thread, do we want the
*_r functions as simple aliases for the non-*_r functions, or do we
really want reentrancy.