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Date: Sun, 31 Aug 2003 11:35:43 -0600 (MDT)
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To: ertr1013@student.uu.se
From: "M. Warner Losh" <imp@bsdimp.com>
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Subject: Re: POSIX_C_SOURCE
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In message: <20030830171343.GA33800@falcon.midgard.homeip.net>
            Erik Trulsson <ertr1013@student.uu.se> writes:
:  /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
:  #if _POSIX_C_SOURCE == 1
:  #undef _POSIX_C_SOURCE		/* Probably illegal, but beyond caring now. */
: @@ -280,6 +282,8 @@
:  #undef _POSIX_C_SOURCE
:  #define	_POSIX_C_SOURCE		199209
:  #endif

That's 100% legal and should *NOT* produce a warning.  Garrett is
right.

Warner