Here comes the forgotten C source, oopsy.

Turned the shell script into a binary fixing several minor buglets.
Mention _POSIX_SOURCE feature test macro in man page.
PR:           bin/19337
Submitted by: schweikh
Reviewed by:  joerg, bde
MFC after:    2 weeks

usr.bin/c89/c89.c

@@ -0,0 +1,108 @@
+/*-
+ * This is the Posix.2 mandated C compiler.  Basically, a hook to the
+ * cc(1) command.
+ *
+ * Copyright (c) 2001 by Jens Schweikhardt
+ *
+ * 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 AUTHOR ``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 AUTHOR OR CONTRIBUTORS 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.
+ *
+ */
+#ifndef lint
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* not lint */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <unistd.h>
+
+#define	CC "/usr/bin/cc"	/* The big kahuna doing the actual work. */
+#define	N_ARGS_PREPENDED (sizeof(args_prepended) / sizeof(args_prepended[0]))
+
+/*
+ * We do not add -D_POSIX_SOURCE here because any POSIX source is supposed to
+ * define it before inclusion of POSIX headers. This has the additional
+ * benefit of making c89 -D_ANSI_SOURCE do the right thing (or any other
+ * -D_FOO_SOURCE feature test macro we support.)
+ */
+static char	*args_prepended[] = {
+	"-std=iso9899:199409",
+	"-pedantic"
+};
+
+static void	usage(void);
+
+/*
+ * Prepend the strings from args_prepended[] to the arg list; parse options,
+ * accepting only the POSIX c89 mandated options. Then exec cc to do the
+ * actual work.
+ */
+int
+main(int argc, char **argv)
+{
+	int Argc, i;
+	char **Argv;
+
+	Argc = 0;
+	Argv = malloc((argc + 1 + N_ARGS_PREPENDED) * sizeof *Argv);
+	if (Argv == NULL)
+		err(1, "malloc");
+	Argv[Argc++] = argv[0];
+	for (i = 0; i < N_ARGS_PREPENDED; ++i)
+		Argv[Argc++] = args_prepended[i];
+	while ((i = getopt(argc, argv, "cD:EgI:l:L:o:OsU:")) != -1) {
+		if (i == '?')
+			usage();
+		if (i == 'l') {
+			if (argv[optind - 1][0] == '-') /* -llib */
+				optind -= 1;
+			else                            /* -l lib */
+				optind -= 2;
+			break; /* -llib or -l lib starts the operands. */
+		}
+	}
+	if (argc == optind) {
+		warnx("missing operand");
+		usage();
+	}
+
+	/* Append argv[1..] at the end of Argv[]. */
+	for (i = 1; i <= argc; ++i)
+		Argv[Argc++] = argv[i];
+	(void)execv(CC, Argv);
+	err(1, "execv(" CC ")");
+}
+
+static void
+usage(void)
+{
+	fprintf(stderr,
+"usage: c89 [-c] [-D name[=value]] [...] [-E] [-g] [-I directory ...]\n"
+"       [-L directory ...] [-o outfile] [-O] [-s] [-U name ...] operand ...\n"
+"\n"
+"       where operand is one or more of file.c, file.o, file.a\n"
+"       or -llibrary\n");
+	exit(1);
+}