make/host/obj.rules

# obj.rules - rules for building object files

#
# Copyright (c) 2013-2014 Wind River Systems, Inc.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1) Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2) Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3) Neither the name of Wind River Systems nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

# user can set the following:
#
#   EXTRA_CFLAGS:         common CFLAGS appended to default CFLAGS_<host>
#   EXTRA_CFLAGS_<host>:  CFLAGS appended to default CFLAGS_<host>
#   HOST_ONLY=<host>:   build only for a specific host (i.e. linux2)
#
# and can override the following:
#
#   CFLAGS_<host>: CFLAGS for a specific host (i.e. linux2)
#   SOURCES: list of C files
#
# defaults:
#
#   CFLAGS_<host>: -I. -Wall -Werror -g -m32 -D<host>
#   SOURCES: all C files in current directory

# object code files
define generate_objs
$1/%.o: %.c ${vOBJDIR_DEP_$1}
	@${vCC_$1} ${CFLAGS_$1} -o $$@ -c $$<
	@printf "%-12s%-20s -> %s\n" "[Compiling] " "$$<" "$$@"

endef

# object code directory
define generate_dir
${vOBJDIR_DEP_$1}: ${MAKEFILE_LIST}
	@mkdir -p $$(dir $$@)
	@touch $$@

endef

# .d dependency files
define generate_deps
$1/%.d: %.c ${vOBJDIR_DEP_$1}
	@${vCC_$1} ${CFLAGS_$1} -MM $$< -MF $$@d
	@sed 's#$${<:.c=.o}#$${@:.d=.o}#' <$$@d >$$@
	@rm -f $$@d

endef

$(foreach host, ${HOST}, $(eval $(call generate_objs,$(host))))
$(foreach host, ${HOST}, $(eval $(call generate_dir,$(host))))
$(foreach host, ${HOST}, $(eval $(call generate_deps,$(host))))

# only generate .d files if not cleaning
ifeq (${MAKECMDGOALS},pristine)
vIGNORE_DOT_D=y
endif
ifeq ($(findstring clean,${MAKECMDGOALS}),clean)
vIGNORE_DOT_D=y
endif

ifneq (${vIGNORE_DOT_D},y)
  ALL_HOSTS = $(foreach host,${HOST},$(if ${HOST_ONLY},$(findstring ${HOST_ONLY},${host}),${host}))
  -include $(foreach src,${SOURCES}, $(addsuffix /${src:.c=.d},${ALL_HOSTS}))
endif # vIGNORE_DOT_D