Add the Clang specific -Wmissing-variable-declarations to WARNS=6.

This compiler flag enforces that that people either mark variables
static or use an external declarations for the variable, similar to how
-Wmissing-prototypes works for functions.

Due to the fact that Yacc/Lex generate code that cannot trivially be
changed to not warn because of this (lots of yy* variables), add a
NO_WMISSING_VARIABLE_DECLARATIONS that can be used to turn off this
specific compiler warning.

Announced on:	toolchain@

7 files changed, 15 insertions, 2 deletions

diff --git a/usr.bin/ar/Makefile b/usr.bin/ar/Makefile
index fa25072..03d9814 100644
--- a/usr.bin/ar/Makefile
+++ b/usr.bin/ar/Makefile
@@ -8,6 +8,8 @@ SRCS=	ar.c acplex.l acpyacc.y read.c util.c write.c y.tab.h
 DPADD=	${LIBARCHIVE} ${LIBELF} ${LIBZ}
 LDADD=	-larchive -lelf -lz
 
+NO_WMISSING_VARIABLE_DECLARATIONS=
+
 CFLAGS+=-I. -I${.CURDIR}
 
 .if ${MK_SHARED_TOOLCHAIN} == "no"
diff --git a/usr.bin/bc/Makefile b/usr.bin/bc/Makefile
index 55f465d..39d54e0 100644
--- a/usr.bin/bc/Makefile
+++ b/usr.bin/bc/Makefile
@@ -8,6 +8,8 @@ CFLAGS+= -I. -I${.CURDIR}
 DPADD=	${LIBEDIT} ${LIBTERMCAP}
 LDADD=	-ledit -ltermcap
 
+NO_WMISSING_VARIABLE_DECLARATIONS=
+
 FILES+=	bc.library
 FILESDIR=${SHAREDIR}/misc
 
diff --git a/usr.bin/bzip2recover/Makefile b/usr.bin/bzip2recover/Makefile
index 7f61946..affe91b 100644
--- a/usr.bin/bzip2recover/Makefile
+++ b/usr.bin/bzip2recover/Makefile
@@ -6,4 +6,6 @@ BZ2DIR=	${.CURDIR}/../../contrib/bzip2
 PROG=	bzip2recover
 NO_MAN=
 
+NO_WMISSING_VARIABLE_DECLARATIONS=
+
 .include <bsd.prog.mk>
diff --git a/usr.bin/find/Makefile b/usr.bin/find/Makefile
index 0c7bb70..cd10f12 100644
--- a/usr.bin/find/Makefile
+++ b/usr.bin/find/Makefile
@@ -6,4 +6,6 @@ SRCS=	find.c function.c ls.c main.c misc.c operator.c option.c \
 	getdate.y
 YFLAGS=
 
+NO_WMISSING_VARIABLE_DECLARATIONS=
+
 .include <bsd.prog.mk>
diff --git a/usr.bin/indent/Makefile b/usr.bin/indent/Makefile
index 8d9ff94..dcd7e39 100644
--- a/usr.bin/indent/Makefile
+++ b/usr.bin/indent/Makefile
@@ -1,6 +1,9 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
+# $FreeBSD$
 
 PROG=	indent
 SRCS=	indent.c io.c lexi.c parse.c pr_comment.c args.c
 
+NO_WMISSING_VARIABLE_DECLARATIONS=
+
 .include <bsd.prog.mk>
diff --git a/usr.bin/m4/Makefile b/usr.bin/m4/Makefile
index 1f1ec5e..f0e22f8 100644
--- a/usr.bin/m4/Makefile
+++ b/usr.bin/m4/Makefile
@@ -8,8 +8,8 @@ PROG=	m4
 CFLAGS+=-DEXTENDED -I${.CURDIR} -I${.CURDIR}/lib
 DPADD=	${LIBY} ${LIBL} ${LIBM}
 LDADD=	-ly -ll -lm
-# clang needs 1 while with gcc we can use 2
-#WARNS=	1
+
+NO_WMISSING_VARIABLE_DECLARATIONS=
 
 SRCS=	eval.c expr.c look.c main.c misc.c gnum4.c trace.c parser.y tokenizer.l
 .PATH: ${.CURDIR}/lib
diff --git a/usr.bin/mklocale/Makefile b/usr.bin/mklocale/Makefile
index e75fe99..83850c4 100644
--- a/usr.bin/mklocale/Makefile
+++ b/usr.bin/mklocale/Makefile
@@ -5,4 +5,6 @@ PROG=	mklocale
 SRCS=	yacc.y lex.l y.tab.h
 CFLAGS+= -I. -I${.CURDIR} -I${.CURDIR}/../../lib/libc/locale
 
+NO_WMISSING_VARIABLE_DECLARATIONS=
+
 .include <bsd.prog.mk>