mk: single mk fragment for new libc

. allow commands to use it by setting NEED_NBSDLIBC
	. also add mkfiles to clean and cleandepend so they
	  don't break on missing new mkfiles

Makefile

@@ -94,7 +94,7 @@ install:
 	$(MAKE) -C share install
 	$(MAKE) -C tools install
 
-clean:
+clean: mkfiles
 	$(MAKE) -C boot clean
 	$(MAKE) -C commands clean
 	$(MAKE) -C bin clean
@@ -103,7 +103,7 @@ clean:
 	$(MAKE) -C lib clean_all
 	$(MAKE) -C test clean
 
-cleandepend:
+cleandepend: mkfiles
 	$(MAKE) -C lib cleandepend_all
 	$(MAKE) -C boot cleandepend
 	$(MAKE) -C commands cleandepend

bin/Makefile.inc

@@ -1,7 +1,4 @@
-# Requires NBSD_LIBC and clang/gcc (we default to using clang)
-NBSD_LIBC:= yes
-CC:=${CC:C/^cc/clang/}
-COMPILER_TYPE:= gnu
+.include <minix.newlibc.mk>
 
 CPPFLAGS+= -D_NETBSD_SOURCE
 

commands/Makefile.inc

@@ -1,3 +1,9 @@
+# Any of the commands can force the new libc being used by 
+# setting NEED_NBSDLIBC
+.if defined(NEED_NBSDLIBC)
+.include <minix.newlibc.mk>
+.endif
+
 .if (${NBSD_LIBC} != "no")
 CPPFLAGS+= -D_MINIX -D_NETBSD_SOURCE -D_MINIX_COMPAT
 LDADD+= -lminlib -lcompat_minix -lasyn -lterminfo

share/mk/Makefile

@@ -12,7 +12,8 @@ FILES=	bsd.dep.mk bsd.files.mk \
 
 # MINIX-specific files
 FILES+= minix.bootprog.mk minix.service.mk minix.ackdep.mk \
-	minix.ack.mk minix.gcc.mk minix.gcov.mk pkgsrchooks.mk
+	minix.ack.mk minix.gcc.mk minix.gcov.mk pkgsrchooks.mk \
+	minix.newlibc.mk
 
 FILESDIR=/usr/share/mk
 .endif

share/mk/minix.newlibc.mk

@@ -0,0 +1,5 @@
+# Force clang/gcc and using new libc
+# Requires NBSD_LIBC and clang/gcc (we default to using clang)
+NBSD_LIBC:= yes
+CC:=${CC:C/^cc/clang/}
+COMPILER_TYPE:= gnu

usr.bin/Makefile.inc

@@ -1,6 +1,4 @@
-# Requires clang/gcc for NetBSD libc
-CC:=${CC:C/^cc/clang/}
-COMPILER_TYPE:= gnu
+.include <minix.newlibc.mk>
 
 CPPFLAGS+= -D_NETBSD_SOURCE -D__NBSD_LIBC=1