diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
index 401e671f22d5..595655a2e43c 100644
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -1,115 +1,115 @@
 # $FreeBSD$
 #
 # This file contains common settings used for building FreeBSD
 # sources.
 
 # Enable various levels of compiler warning checks.  These may be
 # overridden (e.g. if using a non-gcc compiler) by defining NO_WARNS.
 
 # for GCC:  http://gcc.gnu.org/onlinedocs/gcc-3.0.4/gcc_3.html#IDX143
 
 # the default is gnu99 for now
 CSTD		?= gnu99
 
 .if ${CSTD} == "k&r"
 CFLAGS		+= -traditional
 .elif ${CSTD} == "c89" || ${CSTD} == "c90"
 CFLAGS		+= -std=iso9899:1990
 .elif ${CSTD} == "c94" || ${CSTD} == "c95"
 CFLAGS		+= -std=iso9899:199409
 .elif ${CSTD} == "c99"
 CFLAGS		+= -std=iso9899:1999
 .else
 CFLAGS		+= -std=${CSTD}
 .endif
 .if !defined(NO_WARNS)
 # -pedantic is problematic because it also imposes namespace restrictions
 #CFLAGS		+= -pedantic
 . if defined(WARNS)
 .  if ${WARNS} >= 1
 CWARNFLAGS	+=	-Wsystem-headers
-.   if !defined(NO_WERROR) && ((${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang") || !defined(NO_WERROR.clang))
+.   if !defined(NO_WERROR) && ((${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")) || !defined(NO_WERROR.clang))
 CWARNFLAGS	+=	-Werror
 .   endif
 .  endif
 .  if ${WARNS} >= 2
 CWARNFLAGS	+=	-Wall -Wno-format-y2k
 .  endif
 .  if ${WARNS} >= 3
 CWARNFLAGS	+=	-W -Wno-unused-parameter -Wstrict-prototypes\
 			-Wmissing-prototypes -Wpointer-arith
 .  endif
 .  if ${WARNS} >= 4
 CWARNFLAGS	+=	-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch\
 			-Wshadow -Wunused-parameter
-.   if !defined(NO_WCAST_ALIGN) && ((${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang") || !defined(NO_WCAST_ALIGN.clang))
+.   if !defined(NO_WCAST_ALIGN) && ((${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")) || !defined(NO_WCAST_ALIGN.clang))
 CWARNFLAGS	+=	-Wcast-align
 .   endif
 .  endif
 # BDECFLAGS
 .  if ${WARNS} >= 6
 CWARNFLAGS	+=	-Wchar-subscripts -Winline -Wnested-externs\
 			-Wredundant-decls -Wold-style-definition
 .  endif
 .  if ${WARNS} >= 2 && ${WARNS} <= 4
 # XXX Delete -Wuninitialized by default for now -- the compiler doesn't
 # XXX always get it right.
 CWARNFLAGS	+=	-Wno-uninitialized
 .  endif
 CWARNFLAGS	+=	-Wno-pointer-sign
 # Clang has more warnings enabled by default, and when using -Wall, so if WARNS
 # is set to low values, these have to be disabled explicitly.
-.  if ${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang"
+.  if ${CC:T:Mclang} == "clang" || (defined(MK_CLANG_IS_CC) && ${MK_CLANG_IS_CC} != "no")
 .   if ${WARNS} <= 3
 CWARNFLAGS	+=	-Wno-tautological-compare -Wno-unused-value\
 			-Wno-parentheses-equality -Wno-unused-function\
 			-Wno-conversion
 .   endif
 .   if ${WARNS} <= 2
 CWARNFLAGS	+=	-Wno-switch-enum -Wno-empty-body
 .   endif
 .   if ${WARNS} <= 1
 CWARNFLAGS	+=	-Wno-parentheses
 .   endif
 .   if defined(NO_WARRAY_BOUNDS)
 CWARNFLAGS	+=	-Wno-array-bounds
 .   endif
 .  endif
 . endif
 
 . if defined(FORMAT_AUDIT)
 WFORMAT		=	1
 . endif
 . if defined(WFORMAT)
 .  if ${WFORMAT} > 0
 #CWARNFLAGS	+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
 CWARNFLAGS	+=	-Wformat=2 -Wno-format-extra-args
-.   if !defined(NO_WERROR) && ((${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang") || !defined(NO_WERROR.clang))
+.   if !defined(NO_WERROR) && ((${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")) || !defined(NO_WERROR.clang))
 CWARNFLAGS	+=	-Werror
 .   endif
 .  endif
 . endif
-. if defined(NO_WFORMAT) || ((${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang") && defined(NO_WFORMAT.clang))
+. if defined(NO_WFORMAT) || ((${CC:T:Mclang} == "clang" || (defined(MK_CLANG_IS_CC) && ${MK_CLANG_IS_CC} != "no")) && defined(NO_WFORMAT.clang))
 CWARNFLAGS	+=	-Wno-format
 . endif
 .endif
 
 .if defined(IGNORE_PRAGMA)
 CWARNFLAGS	+=	-Wno-unknown-pragmas
 .endif
 
-.if ${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang"
+.if ${CC:T:Mclang} == "clang" || (defined(MK_CLANG_IS_CC) && ${MK_CLANG_IS_CC} != "no")
 CLANG_NO_IAS	=	-no-integrated-as
 CLANG_OPT_SMALL	=	-mllvm -stack-alignment=8 -mllvm -inline-threshold=3 \
 			-mllvm -enable-load-pre=false
 .endif
 
 .if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
     ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
 # Don't use -Wstack-protector as it breaks world with -Werror.
 SSP_CFLAGS	?=	-fstack-protector
 CFLAGS		+=	${SSP_CFLAGS}
 .endif
 
 # Allow user-specified additional warning flags
 CFLAGS		+=	${CWARNFLAGS}
diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index d2ed68de4237..76042d206e7c 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -1,148 +1,148 @@
 # $FreeBSD$
 
 #
 # Warning flags for compiling the kernel and components of the kernel:
 #
 CWARNFLAGS?=	-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
 		-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
 		-Wundef -Wno-pointer-sign -fformat-extensions \
 		-Wmissing-include-dirs -fdiagnostics-show-option \
 		${CWARNEXTRA}
 #
 # The following flags are next up for working on:
 #	-Wextra
 
 # Disable a few warnings for clang, since there are several places in the
 # kernel where fixing them is more trouble than it is worth, or where there is
 # a false positive.
-.if ${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang"
+.if ${CC:T:Mclang} == "clang" || (defined(MK_CLANG_IS_CC) && ${MK_CLANG_IS_CC} != "no")
 NO_WCONSTANT_CONVERSION=	-Wno-constant-conversion
 NO_WARRAY_BOUNDS=		-Wno-array-bounds
 NO_WSHIFT_COUNT_NEGATIVE=	-Wno-shift-count-negative
 NO_WSHIFT_COUNT_OVERFLOW=	-Wno-shift-count-overflow
 NO_WUNUSED_VALUE=		-Wno-unused-value
 NO_WSELF_ASSIGN=		-Wno-self-assign
 NO_WFORMAT_SECURITY=		-Wno-format-security
 # Several other warnings which might be useful in some cases, but not severe
 # enough to error out the whole kernel build.  Display them anyway, so there is
 # some incentive to fix them eventually.
 CWARNEXTRA?=	-Wno-error-tautological-compare -Wno-error-empty-body \
 		-Wno-error-parentheses-equality
 .endif
 
 #
 # On i386, do not align the stack to 16-byte boundaries.  Otherwise GCC 2.95
 # and above adds code to the entry and exit point of every function to align the
 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
 # per function call.  While the 16-byte alignment may benefit micro benchmarks,
 # it is probably an overall loss as it makes the code bigger (less efficient
 # use of code cache tag lines) and uses more stack (less efficient use of data
 # cache tag lines).  Explicitly prohibit the use of FPU, SSE and other SIMD
 # operations inside the kernel itself.  These operations are exclusively
 # reserved for user applications.
 #
 # gcc:
 # Setting -mno-mmx implies -mno-3dnow
 # Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
 #
 # clang:
 # Setting -mno-mmx implies -mno-3dnow, -mno-3dnowa, -mno-sse, -mno-sse2,
 #                          -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
 #
 .if ${MACHINE_CPUARCH} == "i386"
-.if ${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang"
+.if ${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")
 CFLAGS+=	-mno-align-long-strings -mpreferred-stack-boundary=2 -mno-sse
 .else
 CFLAGS+=	-mno-aes -mno-avx
 .endif
 CFLAGS+=	-mno-mmx -msoft-float
 INLINE_LIMIT?=	8000
 .endif
 
 .if ${MACHINE_CPUARCH} == "arm"
 INLINE_LIMIT?=	8000
 .endif
 
 #
 # For IA-64, we use r13 for the kernel globals pointer and we only use
 # a very small subset of float registers for integer divides.
 #
 .if ${MACHINE_CPUARCH} == "ia64"
 CFLAGS+=	-ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
 INLINE_LIMIT?=	15000
 .endif
 
 #
 # For sparc64 we want the medany code model so modules may be located
 # anywhere in the 64-bit address space.  We also tell GCC to use floating
 # point emulation.  This avoids using floating point registers for integer
 # operations which it has a tendency to do.
 #
 .if ${MACHINE_CPUARCH} == "sparc64"
 CFLAGS+=	-mcmodel=medany -msoft-float
 INLINE_LIMIT?=	15000
 .endif
 
 #
 # For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
 # operations inside the kernel itself.  These operations are exclusively
 # reserved for user applications.
 #
 # gcc:
 # Setting -mno-mmx implies -mno-3dnow
 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
 #
 # clang:
 # Setting -mno-mmx implies -mno-3dnow, -mno-3dnowa, -mno-sse, -mno-sse2,
 #                          -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
 # (-mfpmath= is not supported)
 #
 .if ${MACHINE_CPUARCH} == "amd64"
-.if ${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang"
+.if ${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")
 CFLAGS+=	-mno-sse
 .else
 CFLAGS+=	-mno-aes -mno-avx
 .endif
 CFLAGS+=	-mcmodel=kernel -mno-red-zone -mno-mmx -msoft-float \
 		-fno-asynchronous-unwind-tables
 INLINE_LIMIT?=	8000
 .endif
 
 #
 # For PowerPC we tell gcc to use floating point emulation.  This avoids using
 # floating point registers for integer operations which it has a tendency to do.
 # Also explicitly disable Altivec instructions inside the kernel.
 #
 .if ${MACHINE_CPUARCH} == "powerpc"
 CFLAGS+=	-msoft-float -mno-altivec
 INLINE_LIMIT?=	15000
 .endif
 
 #
 # Use dot symbols on powerpc64 to make ddb happy
 #
 .if ${MACHINE_ARCH} == "powerpc64"
 CFLAGS+=	-mcall-aixdesc
 .endif
 
 #
 # For MIPS we also tell gcc to use floating point emulation
 #
 .if ${MACHINE_CPUARCH} == "mips"
 CFLAGS+=	-msoft-float
 INLINE_LIMIT?=	8000
 .endif
 
 #
 # GCC 3.0 and above like to do certain optimizations based on the
 # assumption that the program is linked against libc.  Stop this.
 #
 CFLAGS+=	-ffreestanding
 
 #
 # GCC SSP support
 #
 .if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
     ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
 CFLAGS+=	-fstack-protector
 .endif
diff --git a/sys/conf/kern.pre.mk b/sys/conf/kern.pre.mk
index 07eaa38d374f..fa4ef87b04c8 100644
--- a/sys/conf/kern.pre.mk
+++ b/sys/conf/kern.pre.mk
@@ -1,181 +1,181 @@
 # $FreeBSD$
 
 # Part of a unified Makefile for building kernels.  This part contains all
 # of the definitions that need to be before %BEFORE_DEPEND.
 
 .include <bsd.own.mk>
 
 # backwards compat option for older systems.
 MACHINE_CPUARCH?=${MACHINE_ARCH:C/mipse[lb]/mips/:C/armeb/arm/:C/powerpc64/powerpc/}
 
 # Can be overridden by makeoptions or /etc/make.conf
 KERNEL_KO?=	kernel
 KERNEL?=	kernel
 KODIR?=		/boot/${KERNEL}
 LDSCRIPT_NAME?=	ldscript.$M
 LDSCRIPT?=	$S/conf/${LDSCRIPT_NAME}
 
 M=		${MACHINE_CPUARCH}
 
 AWK?=		awk
 LINT?=		lint
 NM?=		nm
 OBJCOPY?=	objcopy
 SIZE?=		size
 
 .if defined(DEBUG)
 _MINUS_O=	-O
 CTFFLAGS+=	-g
 .else
 .if ${MACHINE_CPUARCH} == "powerpc"
 _MINUS_O=	-O	# gcc miscompiles some code at -O2
 .else
 _MINUS_O=	-O2
 .endif
 .endif
 .if ${MACHINE_CPUARCH} == "amd64"
-.if ${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang"
+.if ${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")
 COPTFLAGS?=-O2 -frename-registers -pipe
 .else
 COPTFLAGS?=-O2 -pipe
 .endif
 .else
 COPTFLAGS?=${_MINUS_O} -pipe
 .endif
 .if !empty(COPTFLAGS:M-O[23s]) && empty(COPTFLAGS:M-fno-strict-aliasing)
 COPTFLAGS+= -fno-strict-aliasing
 .endif
 .if !defined(NO_CPU_COPTFLAGS)
 COPTFLAGS+= ${_CPUCFLAGS}
 .endif
 C_DIALECT= -std=c99
 NOSTDINC= -nostdinc
 
 INCLUDES= ${NOSTDINC} ${INCLMAGIC} -I. -I$S
 
 # This hack lets us use the OpenBSD altq code without spamming a new
 # include path into contrib'ed source files.
 INCLUDES+= -I$S/contrib/altq
 
 .if make(depend) || make(kernel-depend)
 
 # ... and the same for ipfilter
 INCLUDES+= -I$S/contrib/ipfilter
 
 # ... and the same for pf
 INCLUDES+= -I$S/contrib/pf
 
 # ... and the same for ath
 INCLUDES+= -I$S/dev/ath -I$S/dev/ath/ath_hal
 
 # ... and the same for the NgATM stuff
 INCLUDES+= -I$S/contrib/ngatm
 
 # ... and the same for twa
 INCLUDES+= -I$S/dev/twa
 
 # ... and the same for XFS
 INCLUDES+= -I$S/gnu/fs/xfs/FreeBSD -I$S/gnu/fs/xfs/FreeBSD/support -I$S/gnu/fs/xfs
 
 # ... and the same for cxgb and cxgbe
 INCLUDES+= -I$S/dev/cxgb -I$S/dev/cxgbe
 
 .endif
 
 CFLAGS=	${COPTFLAGS} ${C_DIALECT} ${DEBUG} ${CWARNFLAGS}
 CFLAGS+= ${INCLUDES} -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h
-.if ${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang"
+.if ${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")
 CFLAGS+= -fno-common -finline-limit=${INLINE_LIMIT}
 .if ${MACHINE_CPUARCH} != "mips"
 CFLAGS+= --param inline-unit-growth=100
 CFLAGS+= --param large-function-growth=1000
 .else
 # XXX Actually a gross hack just for Octeon because of the Simple Executive.
 CFLAGS+= --param inline-unit-growth=10000
 CFLAGS+= --param large-function-growth=100000
 CFLAGS+= --param max-inline-insns-single=10000
 .endif
 .endif
 WERROR?= -Werror
 
 # XXX LOCORE means "don't declare C stuff" not "for locore.s".
 ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${CFLAGS}
 
 .if ${CC:T:Mclang} == "clang"
 CLANG_NO_IAS= -no-integrated-as
 .endif
 
 .if defined(PROFLEVEL) && ${PROFLEVEL} >= 1
 CFLAGS+=	-DGPROF -falign-functions=16
 .if ${PROFLEVEL} >= 2
 CFLAGS+=	-DGPROF4 -DGUPROF
 PROF=	-pg -mprofiler-epilogue
 .else
 PROF=	-pg
 .endif
 .endif
 DEFINED_PROF=	${PROF}
 
 # Put configuration-specific C flags last (except for ${PROF}) so that they
 # can override the others.
 CFLAGS+=	${CONF_CFLAGS}
 
 # Optional linting. This can be overridden in /etc/make.conf.
 LINTFLAGS=	${LINTOBJKERNFLAGS}
 
 NORMAL_C= ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}
 NORMAL_S= ${CC} -c ${ASM_CFLAGS} ${WERROR} ${.IMPSRC}
 PROFILE_C= ${CC} -c ${CFLAGS} ${WERROR} ${.IMPSRC}
 NORMAL_C_NOWERROR= ${CC} -c ${CFLAGS} ${PROF} ${.IMPSRC}
 
 NORMAL_M= ${AWK} -f $S/tools/makeobjops.awk ${.IMPSRC} -c ; \
 	  ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.PREFIX}.c
 
 .if ${MK_CTF} != "no"
 NORMAL_CTFCONVERT=	${CTFCONVERT} ${CTFFLAGS} ${.TARGET}
 .elif ${MAKE_VERSION} >= 5201111300
 NORMAL_CTFCONVERT=
 .else
 NORMAL_CTFCONVERT=	@:
 .endif
 
 NORMAL_LINT=	${LINT} ${LINTFLAGS} ${CFLAGS:M-[DIU]*} ${.IMPSRC}
 
 # Infiniband C flags.  Correct include paths and omit errors that linux
 # does not honor.
 OFEDINCLUDES=	-I$S/ofed/include/
 OFEDNOERR=	-Wno-cast-qual -Wno-pointer-arith -fms-extensions
 OFEDCFLAGS=	${CFLAGS:N-I*} ${OFEDINCLUDES} ${CFLAGS:M-I*} ${OFEDNOERR}
 OFED_C_NOIMP=	${CC} -c -o ${.TARGET} ${OFEDCFLAGS} ${WERROR} ${PROF}
 OFED_C=		${OFED_C_NOIMP} ${.IMPSRC}
 
 GEN_CFILES= $S/$M/$M/genassym.c ${MFILES:T:S/.m$/.c/}
 SYSTEM_CFILES= config.c env.c hints.c vnode_if.c
 SYSTEM_DEP= Makefile ${SYSTEM_OBJS}
 SYSTEM_OBJS= locore.o ${MDOBJS} ${OBJS}
 SYSTEM_OBJS+= ${SYSTEM_CFILES:.c=.o}
 SYSTEM_OBJS+= hack.So
 SYSTEM_LD= @${LD} -Bdynamic -T ${LDSCRIPT} \
 	-warn-common -export-dynamic -dynamic-linker /red/herring \
 	-o ${.TARGET} -X ${SYSTEM_OBJS} vers.o
 SYSTEM_LD_TAIL= @${OBJCOPY} --strip-symbol gcc2_compiled. ${.TARGET} ; \
 	${SIZE} ${.TARGET} ; chmod 755 ${.TARGET}
 SYSTEM_DEP+= ${LDSCRIPT}
 
 # MKMODULESENV is set here so that port makefiles can augment
 # them.
 
 MKMODULESENV+=	MAKEOBJDIRPREFIX=${.OBJDIR}/modules KMODDIR=${KODIR}
 MKMODULESENV+=	MACHINE_CPUARCH=${MACHINE_CPUARCH}
 .if (${KERN_IDENT} == LINT)
 MKMODULESENV+=	ALL_MODULES=LINT
 .endif
 .if defined(MODULES_OVERRIDE)
 MKMODULESENV+=	MODULES_OVERRIDE="${MODULES_OVERRIDE}"
 .endif
 .if defined(WITHOUT_MODULES)
 MKMODULESENV+=	WITHOUT_MODULES="${WITHOUT_MODULES}"
 .endif
 .if defined(DEBUG)
 MKMODULESENV+=	DEBUG_FLAGS="${DEBUG}"
 .endif
diff --git a/sys/conf/kmod.mk b/sys/conf/kmod.mk
index cb460ee98491..98437b3ef414 100644
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -1,482 +1,482 @@
 #	From: @(#)bsd.prog.mk	5.26 (Berkeley) 6/25/91
 # $FreeBSD$
 #
 # The include file <bsd.kmod.mk> handles building and installing loadable
 # kernel modules.
 #
 #
 # +++ variables +++
 #
 # CLEANFILES	Additional files to remove for the clean and cleandir targets.
 #
 # EXPORT_SYMS	A list of symbols that should be exported from the module,
 #		or the name of a file containing a list of symbols, or YES
 #		to export all symbols.  If not defined, no symbols are
 #		exported.
 #
 # KMOD		The name of the kernel module to build.
 #
 # KMODDIR	Base path for kernel modules (see kld(4)). [/boot/kernel]
 #
 # KMODOWN	Module file owner. [${BINOWN}]
 #
 # KMODGRP	Module file group. [${BINGRP}]
 #
 # KMODMODE	Module file mode. [${BINMODE}]
 #
 # KMODLOAD	Command to load a kernel module [/sbin/kldload]
 #
 # KMODUNLOAD	Command to unload a kernel module [/sbin/kldunload]
 #
 # MFILES	Optionally a list of interfaces used by the module.
 #		This file contains a default list of interfaces.
 #
 # PROG		The name of the kernel module to build.
 #		If not supplied, ${KMOD}.ko is used.
 #
 # SRCS		List of source files.
 #
 # FIRMWS	List of firmware images in format filename:shortname:version
 #
 # FIRMWARE_LICENSE
 #		Set to the name of the license the user has to agree on in
 #		order to use this firmware. See /usr/share/doc/legal
 #
 # DESTDIR	The tree where the module gets installed. [not set]
 #
 # +++ targets +++
 #
 # 	install:
 #               install the kernel module; if the Makefile
 #               does not itself define the target install, the targets
 #               beforeinstall and afterinstall may also be used to cause
 #               actions immediately before and after the install target
 #		is executed.
 #
 # 	load:
 #		Load a module.
 #
 # 	unload:
 #		Unload a module.
 #
 
 # backwards compat option for older systems.
 MACHINE_CPUARCH?=${MACHINE_ARCH:C/mipse[lb]/mips/:C/armeb/arm/:C/powerpc64/powerpc/}
 
 AWK?=		awk
 KMODLOAD?=	/sbin/kldload
 KMODUNLOAD?=	/sbin/kldunload
 OBJCOPY?=	objcopy
 
 .if defined(KMODDEPS)
 .error "Do not use KMODDEPS on 5.0+; use MODULE_VERSION/MODULE_DEPEND"
 .endif
 
 .include <bsd.init.mk>
 
 .SUFFIXES: .out .o .c .cc .cxx .C .y .l .s .S
 
 # amd64 and mips use direct linking for kmod, all others use shared binaries
 .if ${MACHINE_CPUARCH} != amd64 && ${MACHINE_CPUARCH} != mips
 __KLD_SHARED=yes
 .else
 __KLD_SHARED=no
 .endif
 
 .if !empty(CFLAGS:M-O[23s]) && empty(CFLAGS:M-fno-strict-aliasing)
 CFLAGS+=	-fno-strict-aliasing
 .endif
 WERROR?=	-Werror
 CFLAGS+=	${WERROR}
 CFLAGS+=	-D_KERNEL
 CFLAGS+=	-DKLD_MODULE
 
 # Don't use any standard or source-relative include directories.
 CSTD=		c99
 NOSTDINC=	-nostdinc
 CFLAGS:=	${CFLAGS:N-I*} ${NOSTDINC} ${INCLMAGIC} ${CFLAGS:M-I*}
 .if defined(KERNBUILDDIR)
 CFLAGS+=	-DHAVE_KERNEL_OPTION_HEADERS -include ${KERNBUILDDIR}/opt_global.h
 .endif
 
 # Add -I paths for system headers.  Individual module makefiles don't
 # need any -I paths for this.  Similar defaults for .PATH can't be
 # set because there are no standard paths for non-headers.
 CFLAGS+=	-I. -I@
 
 # Add -I path for altq headers as they are included via net/if_var.h
 # for example.
 CFLAGS+=	-I@/contrib/altq
 
-.if ${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang"
+.if ${CC:T:Mclang} != "clang" && (!defined(MK_CLANG_IS_CC) || ${MK_CLANG_IS_CC} == "no")
 CFLAGS+=	-finline-limit=${INLINE_LIMIT}
 CFLAGS+= --param inline-unit-growth=100
 CFLAGS+= --param large-function-growth=1000
 .endif
 
 # Disallow common variables, and if we end up with commons from
 # somewhere unexpected, allocate storage for them in the module itself.
 CFLAGS+=	-fno-common
 LDFLAGS+=	-d -warn-common
 
 CFLAGS+=	${DEBUG_FLAGS}
 .if ${MACHINE_CPUARCH} == amd64
 CFLAGS+=	-fno-omit-frame-pointer
 .endif
 
 .if ${MACHINE_CPUARCH} == powerpc
 CFLAGS+=	-mlongcall -fno-omit-frame-pointer
 .endif
 
 .if ${MACHINE_CPUARCH} == mips
 CFLAGS+=	-G0 -fno-pic -mno-abicalls -mlong-calls
 .endif
 
 .if defined(DEBUG) || defined(DEBUG_FLAGS)
 CTFFLAGS+=	-g
 .endif
 
 .if defined(FIRMWS)
 .if !exists(@)
 ${KMOD:S/$/.c/}: @
 .else
 ${KMOD:S/$/.c/}: @/tools/fw_stub.awk
 .endif
 	${AWK} -f @/tools/fw_stub.awk ${FIRMWS} -m${KMOD} -c${KMOD:S/$/.c/g} \
 	    ${FIRMWARE_LICENSE:C/.+/-l/}${FIRMWARE_LICENSE}
 
 SRCS+=	${KMOD:S/$/.c/}
 CLEANFILES+=	${KMOD:S/$/.c/}
 
 .for _firmw in ${FIRMWS}
 ${_firmw:C/\:.*$/.fwo/}:	${_firmw:C/\:.*$//}
 	@${ECHO} ${_firmw:C/\:.*$//} ${.ALLSRC:M*${_firmw:C/\:.*$//}}
 	@if [ -e ${_firmw:C/\:.*$//} ]; then			\
 		${LD} -b binary --no-warn-mismatch ${LDFLAGS}	\
 		    -r -d -o ${.TARGET}	${_firmw:C/\:.*$//};	\
 	else							\
 		ln -s ${.ALLSRC:M*${_firmw:C/\:.*$//}} ${_firmw:C/\:.*$//}; \
 		${LD} -b binary --no-warn-mismatch ${LDFLAGS}	\
 		    -r -d -o ${.TARGET}	${_firmw:C/\:.*$//};	\
 		rm ${_firmw:C/\:.*$//};				\
 	fi
 
 OBJS+=	${_firmw:C/\:.*$/.fwo/}
 .endfor
 .endif
 
 OBJS+=	${SRCS:N*.h:R:S/$/.o/g}
 
 .if !defined(PROG)
 PROG=	${KMOD}.ko
 .endif
 
 .if !defined(DEBUG_FLAGS)
 FULLPROG=	${PROG}
 .else
 FULLPROG=	${PROG}.debug
 ${PROG}: ${FULLPROG} ${PROG}.symbols
 	${OBJCOPY} --strip-debug --add-gnu-debuglink=${PROG}.symbols\
 	    ${FULLPROG} ${.TARGET}
 ${PROG}.symbols: ${FULLPROG}
 	${OBJCOPY} --only-keep-debug ${FULLPROG} ${.TARGET}
 .endif
 
 .if ${__KLD_SHARED} == yes
 ${FULLPROG}: ${KMOD}.kld
 	${LD} -Bshareable ${LDFLAGS} -o ${.TARGET} ${KMOD}.kld
 .if !defined(DEBUG_FLAGS)
 	${OBJCOPY} --strip-debug ${.TARGET}
 .endif
 .endif
 
 EXPORT_SYMS?=	NO
 .if ${EXPORT_SYMS} != YES
 CLEANFILES+=	export_syms
 .endif
 
 .if ${__KLD_SHARED} == yes
 ${KMOD}.kld: ${OBJS}
 .else
 ${FULLPROG}: ${OBJS}
 .endif
 	${LD} ${LDFLAGS} -r -d -o ${.TARGET} ${OBJS}
 .if defined(MK_CTF) && ${MK_CTF} != "no"
 	${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ${OBJS}
 .endif
 .if defined(EXPORT_SYMS)
 .if ${EXPORT_SYMS} != YES
 .if ${EXPORT_SYMS} == NO
 	:> export_syms
 .elif !exists(${.CURDIR}/${EXPORT_SYMS})
 	echo ${EXPORT_SYMS} > export_syms
 .else
 	grep -v '^#' < ${EXPORT_SYMS} > export_syms
 .endif
 	awk -f ${SYSDIR}/conf/kmod_syms.awk ${.TARGET} \
 	    export_syms | xargs -J% ${OBJCOPY} % ${.TARGET}
 .endif
 .endif
 .if !defined(DEBUG_FLAGS) && ${__KLD_SHARED} == no
 	${OBJCOPY} --strip-debug ${.TARGET}
 .endif
 
 _ILINKS=@ machine
 .if ${MACHINE} != ${MACHINE_CPUARCH}
 _ILINKS+=${MACHINE_CPUARCH}
 .endif
 .if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
 _ILINKS+=x86
 .endif
 
 all: objwarn ${PROG}
 
 beforedepend: ${_ILINKS}
 
 # Ensure that the links exist without depending on it when it exists which
 # causes all the modules to be rebuilt when the directory pointed to changes.
 .for _link in ${_ILINKS}
 .if !exists(${.OBJDIR}/${_link})
 ${OBJS}: ${_link}
 .endif
 .endfor
 
 # Search for kernel source tree in standard places.
 .for _dir in ${.CURDIR}/../.. ${.CURDIR}/../../.. /sys /usr/src/sys
 .if !defined(SYSDIR) && exists(${_dir}/kern/)
 SYSDIR=	${_dir}
 .endif
 .endfor
 .if !defined(SYSDIR) || !exists(${SYSDIR}/kern/)
 .error "can't find kernel source tree"
 .endif
 
 ${_ILINKS}:
 	@case ${.TARGET} in \
 	machine) \
 		path=${SYSDIR}/${MACHINE}/include ;; \
 	@) \
 		path=${SYSDIR} ;; \
 	*) \
 		path=${SYSDIR}/${.TARGET}/include ;; \
 	esac ; \
 	path=`(cd $$path && /bin/pwd)` ; \
 	${ECHO} ${.TARGET} "->" $$path ; \
 	ln -sf $$path ${.TARGET}
 
 CLEANFILES+= ${PROG} ${KMOD}.kld ${OBJS}
 
 .if defined(DEBUG_FLAGS)
 CLEANFILES+= ${FULLPROG} ${PROG}.symbols
 .endif
 
 .if !target(install)
 
 _INSTALLFLAGS:=	${INSTALLFLAGS}
 .for ie in ${INSTALLFLAGS_EDIT}
 _INSTALLFLAGS:=	${_INSTALLFLAGS${ie}}
 .endfor
 
 .if !target(realinstall)
 realinstall: _kmodinstall
 .ORDER: beforeinstall _kmodinstall
 _kmodinstall:
 	${INSTALL} -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
 	    ${_INSTALLFLAGS} ${PROG} ${DESTDIR}${KMODDIR}
 .if defined(DEBUG_FLAGS) && !defined(INSTALL_NODEBUG) && \
     (defined(MK_KERNEL_SYMBOLS) && ${MK_KERNEL_SYMBOLS} != "no")
 	${INSTALL} -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
 	    ${_INSTALLFLAGS} ${PROG}.symbols ${DESTDIR}${KMODDIR}
 .endif
 
 .include <bsd.links.mk>
 
 .if !defined(NO_XREF)
 afterinstall: _kldxref
 .ORDER: realinstall _kldxref
 .ORDER: _installlinks _kldxref
 _kldxref:
 	@if type kldxref >/dev/null 2>&1; then \
 		${ECHO} kldxref ${DESTDIR}${KMODDIR}; \
 		kldxref ${DESTDIR}${KMODDIR}; \
 	fi
 .endif
 .endif # !target(realinstall)
 
 .endif # !target(install)
 
 .if !target(load)
 load: ${PROG}
 	${KMODLOAD} -v ${.OBJDIR}/${PROG}
 .endif
 
 .if !target(unload)
 unload:
 	${KMODUNLOAD} -v ${PROG}
 .endif
 
 .if defined(KERNBUILDDIR)
 .PATH: ${KERNBUILDDIR}
 CFLAGS+=	-I${KERNBUILDDIR}
 .for _src in ${SRCS:Mopt_*.h}
 CLEANFILES+=	${_src}
 .if !target(${_src})
 ${_src}:
 	ln -sf ${KERNBUILDDIR}/${_src} ${.TARGET}
 .endif
 .endfor
 .else
 .for _src in ${SRCS:Mopt_*.h}
 CLEANFILES+=	${_src}
 .if !target(${_src})
 ${_src}:
 	:> ${.TARGET}
 .endif
 .endfor
 .endif
 
 # Respect configuration-specific C flags.
 CFLAGS+=	${CONF_CFLAGS}
 
 MFILES?= dev/acpica/acpi_if.m dev/acpi_support/acpi_wmi_if.m \
 	dev/agp/agp_if.m dev/ata/ata_if.m dev/eisa/eisa_if.m \
 	dev/gpio/gpio_if.m dev/gpio/gpiobus_if.m \
 	dev/iicbus/iicbb_if.m dev/iicbus/iicbus_if.m \
 	dev/mmc/mmcbr_if.m dev/mmc/mmcbus_if.m \
 	dev/mii/miibus_if.m dev/mvs/mvs_if.m dev/ofw/ofw_bus_if.m \
 	dev/pccard/card_if.m dev/pccard/power_if.m dev/pci/pci_if.m \
 	dev/pci/pcib_if.m dev/ppbus/ppbus_if.m dev/smbus/smbus_if.m \
 	dev/sound/pci/hda/hdac_if.m \
 	dev/sound/pcm/ac97_if.m dev/sound/pcm/channel_if.m \
 	dev/sound/pcm/feeder_if.m dev/sound/pcm/mixer_if.m \
 	dev/sound/midi/mpu_if.m dev/sound/midi/mpufoi_if.m \
 	dev/sound/midi/synth_if.m dev/usb/usb_if.m isa/isa_if.m \
 	kern/bus_if.m kern/clock_if.m \
 	kern/cpufreq_if.m kern/device_if.m kern/serdev_if.m \
 	libkern/iconv_converter_if.m opencrypto/cryptodev_if.m \
 	pc98/pc98/canbus_if.m
 
 .for _srcsrc in ${MFILES}
 .for _ext in c h
 .for _src in ${SRCS:M${_srcsrc:T:R}.${_ext}}
 CLEANFILES+=	${_src}
 .if !target(${_src})
 .if !exists(@)
 ${_src}: @
 .else
 ${_src}: @/tools/makeobjops.awk @/${_srcsrc}
 .endif
 	${AWK} -f @/tools/makeobjops.awk @/${_srcsrc} -${_ext}
 .endif
 .endfor # _src
 .endfor # _ext
 .endfor # _srcsrc
 
 .if !empty(SRCS:Mvnode_if.c)
 CLEANFILES+=	vnode_if.c
 .if !exists(@)
 vnode_if.c: @
 .else
 vnode_if.c: @/tools/vnode_if.awk @/kern/vnode_if.src
 .endif
 	${AWK} -f @/tools/vnode_if.awk @/kern/vnode_if.src -c
 .endif
 
 .if !empty(SRCS:Mvnode_if.h)
 CLEANFILES+=	vnode_if.h vnode_if_newproto.h vnode_if_typedef.h
 .if !exists(@)
 vnode_if.h vnode_if_newproto.h vnode_if_typedef.h: @
 .else
 vnode_if.h vnode_if_newproto.h vnode_if_typedef.h: @/tools/vnode_if.awk \
     @/kern/vnode_if.src
 .endif
 vnode_if.h: vnode_if_newproto.h vnode_if_typedef.h
 	${AWK} -f @/tools/vnode_if.awk @/kern/vnode_if.src -h
 vnode_if_newproto.h:
 	${AWK} -f @/tools/vnode_if.awk @/kern/vnode_if.src -p
 vnode_if_typedef.h:
 	${AWK} -f @/tools/vnode_if.awk @/kern/vnode_if.src -q
 .endif
 
 .for _i in mii pccard
 .if !empty(SRCS:M${_i}devs.h)
 CLEANFILES+=	${_i}devs.h
 .if !exists(@)
 ${_i}devs.h: @
 .else
 ${_i}devs.h: @/tools/${_i}devs2h.awk @/dev/${_i}/${_i}devs
 .endif
 	${AWK} -f @/tools/${_i}devs2h.awk @/dev/${_i}/${_i}devs
 .endif
 .endfor # _i
 
 .if !empty(SRCS:Musbdevs.h)
 CLEANFILES+=	usbdevs.h
 .if !exists(@)
 usbdevs.h: @
 .else
 usbdevs.h: @/tools/usbdevs2h.awk @/dev/usb/usbdevs
 .endif
 	${AWK} -f @/tools/usbdevs2h.awk @/dev/usb/usbdevs -h
 .endif
 
 .if !empty(SRCS:Musbdevs_data.h)
 CLEANFILES+=	usbdevs_data.h
 .if !exists(@)
 usbdevs_data.h: @
 .else
 usbdevs_data.h: @/tools/usbdevs2h.awk @/dev/usb/usbdevs
 .endif
 	${AWK} -f @/tools/usbdevs2h.awk @/dev/usb/usbdevs -d
 .endif
 
 .if !empty(SRCS:Macpi_quirks.h)
 CLEANFILES+=	acpi_quirks.h
 .if !exists(@)
 acpi_quirks.h: @
 .else
 acpi_quirks.h: @/tools/acpi_quirks2h.awk @/dev/acpica/acpi_quirks
 .endif
 	${AWK} -f @/tools/acpi_quirks2h.awk @/dev/acpica/acpi_quirks
 .endif
 
 .if !empty(SRCS:Massym.s)
 CLEANFILES+=	assym.s genassym.o
 assym.s: genassym.o
 .if defined(KERNBUILDDIR)
 genassym.o: opt_global.h
 .endif
 .if !exists(@)
 assym.s: @
 .else
 assym.s: @/kern/genassym.sh
 .endif
 	sh @/kern/genassym.sh genassym.o > ${.TARGET}
 .if exists(@)
 genassym.o: @/${MACHINE_CPUARCH}/${MACHINE_CPUARCH}/genassym.c
 .endif
 genassym.o: @ machine ${SRCS:Mopt_*.h}
 	${CC} -c ${CFLAGS:N-fno-common} \
 	    @/${MACHINE_CPUARCH}/${MACHINE_CPUARCH}/genassym.c
 .endif
 
 lint: ${SRCS}
 	${LINT} ${LINTKERNFLAGS} ${CFLAGS:M-[DILU]*} ${.ALLSRC:M*.c}
 
 .if defined(KERNBUILDDIR)
 ${OBJS}: opt_global.h
 .endif
 
 .include <bsd.dep.mk>
 
 cleandepend: cleanilinks
 # .depend needs include links so we remove them only together.
 cleanilinks:
 	rm -f ${_ILINKS}
 
 .if !exists(${.OBJDIR}/${DEPENDFILE})
 ${OBJS}: ${SRCS:M*.h}
 .endif
 
 .include <bsd.obj.mk>
 .include "kern.mk"