Fix for cc so that -o works with -c and -S

[Kent Peacock]

[]
Index:	bin/cc.c 4.2BSD

Description:
	The -o option on cc works only when creating a final load module.
	It would be advantageous to be able to use it when the -c option
	is specified, so that one could write:
		cc -c directory/cfile.c -o directory/cfile.o
	This is particularly useful in makefiles, for the rule:
	.c.o:
		cc -c $*.c -o $@
	since source in subdirectories can be handled properly.
	It also allows use of different suffixes (.b for example)
	when object code for multiple machines is produced in a
	single directory. Similary benefits accrue from allowing it
	with -S also. Note that the change is also backwards compatible,
	except that it is now possible to overwrite .o files when
	-c or -S is not specified.
Repeat-By:
	cc -c file.c -o file.o
Fix:
*** occ.c	Thu Nov 29 09:17:10 1984
--- ncc.c	Thu Nov 29 09:18:03 1984
***************
*** 57,63
  				switch (getsuf(outfile)) {
  
  				case 'c':
- 				case 'o':
  					error("-o would overwrite %s",
  					    outfile);
  					exit(8);

--- 57,62 -----
  				switch (getsuf(outfile)) {
  
  				case 'c':
  					error("-o would overwrite %s",
  					    outfile);
  					exit(8);
***************
*** 197,204
  			cflag++;
  			continue;
  		}
! 		if (sflag)
! 			assource = tmp3 = setsuf(clist[i], 's');
  		av[0] = "ccom"; av[1] = tmp4; av[2] = oflag?tmp5:tmp3; na = 3;
  		if (proflag)
  			av[na++] = "-XP";

--- 196,208 -----
  			cflag++;
  			continue;
  		}
! 		if (sflag) {
! 			if (nc==1 && outfile)
! 				tmp3 = outfile;
! 			else
! 				tmp3 = setsuf(clist[i], 's');
! 			assource = tmp3;
! 		}
  		av[0] = "ccom"; av[1] = tmp4; av[2] = oflag?tmp5:tmp3; na = 3;
  		if (proflag)
  			av[na++] = "-XP";
***************
*** 228,234
  	assemble:
  		cunlink(tmp1); cunlink(tmp2); cunlink(tmp4);
  		av[0] = "as"; av[1] = "-o";
! 		av[2] = setsuf(clist[i], 'o');
  		na = 3;
  		if (Rflag)
  			av[na++] = "-R";

--- 232,241 -----
  	assemble:
  		cunlink(tmp1); cunlink(tmp2); cunlink(tmp4);
  		av[0] = "as"; av[1] = "-o";
! 		if (cflag && nc==1 && outfile) {
! 			av[2] = outfile;
! 		} else
! 			av[2] = setsuf(clist[i], 'o');
  		na = 3;
  		if (Rflag)
  			av[na++] = "-R";