Add a -C ala GNU make(1) for Makefiles which are too lazy to use $(MAKE) and

this particular GNU flag.  It changes into the given directory for the
operation in question.  This just goes into said directory at the time of
parsing the argument for getopt(3).

Submitted by:	Rachel Hestilow <rachel@jerkcity.com>

usr.bin/make/Makefile

@@ -15,7 +15,7 @@ SRCS+=	lstAppend.c lstAtEnd.c lstAtFront.c lstClose.c lstConcat.c \
 
 NOSHARED?=	YES
 
-CFLAGS+=-DMAKE_VERSION=\"5200205240\"
+CFLAGS+=-DMAKE_VERSION=\"5200208240\"
 
 main.o: ${MAKEFILE}
 

usr.bin/make/main.c

@@ -167,12 +167,15 @@ MainParseArgs(argc, argv)
 
 	optind = 1;	/* since we're called more than once */
 #ifdef REMOTE
-# define OPTFLAGS "BD:E:I:L:PSV:Xd:ef:ij:km:nqrstv"
+# define OPTFLAGS "BC:D:E:I:L:PSV:Xd:ef:ij:km:nqrstv"
 #else
-# define OPTFLAGS "BD:E:I:PSV:Xd:ef:ij:km:nqrstv"
+# define OPTFLAGS "BC:D:E:I:PSV:Xd:ef:ij:km:nqrstv"
 #endif
 rearg:	while((c = getopt(argc, argv, OPTFLAGS)) != -1) {
 		switch(c) {
+		case 'C':
+			chdir(optarg);
+			break;
 		case 'D':
 			Var_Set(optarg, "1", VAR_GLOBAL);
 			Var_Append(MAKEFLAGS, "-D", VAR_GLOBAL);

usr.bin/make/make.1

@@ -41,6 +41,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl BPSXeiknqrstv
+.Op Fl C Ar directory
 .Op Fl D Ar variable
 .Op Fl d Ar flags
 .Op Fl E Ar variable
@@ -88,6 +89,10 @@ by executing the commands to make the sources of a dependency line in sequence.
 This is turned on by default unless
 .Fl j
 is used.
+.It Fl C Ar directory
+Change to
+.Ar directory
+while running.
 .It Fl D Ar variable
 Define
 .Ar variable