c89 is the Posix.2 name for a C compiler that accepts ANSI/ISO C source

code.  Basically a shortcut to cc -ansi -trigraphs.

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+.\"
+.\" Copyright (c) 1997 Joerg Wunsch
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $Id$
+.\" "
+.Dd September 17, 1997
+.Os
+.Dt C89 1
+.Sh NAME
+.Nm c89
+.Nd Posix.2 C language compiler
+.Sh SYNOPSIS
+.Nm c89
+.Op Fl c
+.Op Fl D Ar name Ns Op Ar =value 
+.Op ...
+.Op Fl E
+.Op Fl g
+.Op Fl I Ar directory ...
+.Op Fl L Ar directory ...
+.Op Fl o Ar outfile
+.Op Fl O
+.Op Fl s
+.Op Fl U Ar name ...
+.Ar operand ...
+.Sh DESCRIPTION
+This is the name of the C language compiler as required by the
+.St -p1003.2 .
+standard.
+.Pp
+Since the standard demands that any program conforming to the C language
+standard must be acceptable, the
+.Xr cc 1
+options
+.Fl ansi
+and
+.Fl trigraphs
+are always in effect, and an attempt to call
+.Nm
+with the
+.Fl traditional
+will be rejected.
+.Pp
+See the manual page for
+.Xr cc 1
+for a complete description.
+.Sh SEE ALSO
+.Xr cc 1
+.Sh STANDARDS
+The
+.Nm
+command is believed to comply with
+.St -p1003.2 .