This is xnu-8019. See this file in:
#
# Mach Operating System
# Copyright (c) 1986 Carnegie-Mellon University
# All rights reserved.  The CMU software License Agreement specifies
# the terms and conditions for use and redistribution.
#

export MakeInc_cmd=${SRCROOT}/makedefs/MakeInc.cmd
export MakeInc_def=${SRCROOT}/makedefs/MakeInc.def
export MakeInc_rule=${SRCROOT}/makedefs/MakeInc.rule
export MakeInc_dir=${SRCROOT}/makedefs/MakeInc.dir

include $(MakeInc_cmd)
include $(MakeInc_def)

#
# CFLAGS
#
CFLAGS+= -include meta_features.h -DPEXPERT_KERNEL_PRIVATE
SFLAGS+= -include meta_features.h

#
# Directories for mig generated files
#
COMP_SUBDIRS =

#
#  Make sure we don't remove this by accident if interrupted at the wrong
#  time.
#
.PRECIOUS: Makefile

#
#  Theses macros are filled in by the config program depending on the
#  current configuration.  The MACHDEP macro is replaced by the
#  contents of the machine dependent makefile template and the others
#  are replaced by the corresponding symbol definitions for the
#  configuration.
#

%OBJS

%LIBOBJS

%CFILES

%CXXFILES

%SFILES

%MACHDEP

#
# Diagnostic opt-outs.  We need to make this list empty.
#
# DO NOT ADD MORE HERE.
#
# -Wno-cast-align
pe_identify_machine.o_CWARNFLAGS_ADD += -Wno-cast-align
# -Wno-implicit-int-conversion
pe_serial.o_CWARNFLAGS_ADD += -Wno-implicit-int-conversion
# -Wno-shorten-64-to-32
pe_identify_machine.o_CWARNFLAGS_ADD += -Wno-shorten-64-to-32
pe_init.o_CWARNFLAGS_ADD += -Wno-shorten-64-to-32
# -Wno-sign-conversion
bootargs.o_CWARNFLAGS_ADD += -Wno-sign-conversion
device_tree.o_CWARNFLAGS_ADD += -Wno-sign-conversion
pe_identify_machine.o_CWARNFLAGS_ADD += -Wno-sign-conversion
pe_init.o_CWARNFLAGS_ADD += -Wno-sign-conversion
pe_serial.o_CWARNFLAGS_ADD += -Wno-sign-conversion

# Rebuild if per-file overrides change
${OBJS}: $(firstword $(MAKEFILE_LIST))

# Rebuild if global compile flags change
$(COBJS): .CFLAGS
.CFLAGS: ALWAYS
	$(_v)$(REPLACECONTENTS) $@ $(KCC) $(CFLAGS) $(INCFLAGS)
$(CXXOBJS): .CXXFLAGS
.CXXFLAGS: ALWAYS
	$(_v)$(REPLACECONTENTS) $@ $(KC++) $(CXXFLAGS) $(INCFLAGS)
$(SOBJS): .SFLAGS
.SFLAGS: ALWAYS
	$(_v)$(REPLACECONTENTS) $@ $(S_KCC) $(SFLAGS) $(INCFLAGS)

$(COMPONENT).filelist: $(OBJS)
	@$(LOG_LDFILELIST) "$(COMPONENT)"
	$(_v)for obj in ${OBJS}; do	\
		 $(ECHO) $(TARGET)/$(CURRENT_KERNEL_CONFIG)/$${obj}; \
	done > $(COMPONENT).filelist

$(COMPONENT).libfilelist: $(LIBOBJS)
	@$(LOG_LDFILELIST) "lib$(COMPONENT)"
	$(_v)for obj in ${LIBOBJS}; do	\
		 $(ECHO) $(TARGET)/$(CURRENT_KERNEL_CONFIG)/$${obj}; \
	done > $(COMPONENT).libfilelist

ifeq ($(RC_ProjectName),xnu_libraries)
do_all: $(COMPONENT).libfilelist
else
do_all: $(COMPONENT).filelist
endif

do_build_all:: do_all

%RULES

include $(MakeInc_rule)
include $(MakeInc_dir)