d7a3d85e08
Allow nesting into directories without Build file. Currently we force include of the Build file, which fails the build when the Build file is missing. We already support empty *-in.o' objects if there's nothing in the directory to be compiled, so we can just use it for missing Build file cases. Also adding this case under tests. Reported-by: Rabin Vincent <rabin.vincent@axis.com> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Rabin Vincent <rabin.vincent@axis.com> Link: http://lkml.kernel.org/r/1432914178-24086-1-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
131 lines
3.1 KiB
Makefile
131 lines
3.1 KiB
Makefile
###
|
|
# Main build makefile.
|
|
#
|
|
# Lots of this code have been borrowed or heavily inspired from parts
|
|
# of kbuild code, which is not credited, but mostly developed by:
|
|
#
|
|
# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
|
|
# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
|
|
#
|
|
|
|
PHONY := __build
|
|
__build:
|
|
|
|
ifeq ($(V),1)
|
|
quiet =
|
|
Q =
|
|
else
|
|
quiet=quiet_
|
|
Q=@
|
|
endif
|
|
|
|
build-dir := $(srctree)/tools/build
|
|
|
|
# Generic definitions
|
|
include $(build-dir)/Build.include
|
|
|
|
# do not force detected configuration
|
|
-include .config-detected
|
|
|
|
# Init all relevant variables used in build files so
|
|
# 1) they have correct type
|
|
# 2) they do not inherit any value from the environment
|
|
subdir-y :=
|
|
obj-y :=
|
|
subdir-y :=
|
|
subdir-obj-y :=
|
|
|
|
# Build definitions
|
|
build-file := $(dir)/Build
|
|
-include $(build-file)
|
|
|
|
quiet_cmd_flex = FLEX $@
|
|
quiet_cmd_bison = BISON $@
|
|
|
|
# Create directory unless it exists
|
|
quiet_cmd_mkdir = MKDIR $(dir $@)
|
|
cmd_mkdir = mkdir -p $(dir $@)
|
|
rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
|
|
|
|
# Compile command
|
|
quiet_cmd_cc_o_c = CC $@
|
|
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
|
|
|
|
quiet_cmd_cc_i_c = CPP $@
|
|
cmd_cc_i_c = $(CC) $(c_flags) -E -o $@ $<
|
|
|
|
quiet_cmd_cc_s_c = AS $@
|
|
cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
|
|
|
|
# Link agregate command
|
|
# If there's nothing to link, create empty $@ object.
|
|
quiet_cmd_ld_multi = LD $@
|
|
cmd_ld_multi = $(if $(strip $(obj-y)),\
|
|
$(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@)
|
|
|
|
# Build rules
|
|
$(OUTPUT)%.o: %.c FORCE
|
|
$(call rule_mkdir)
|
|
$(call if_changed_dep,cc_o_c)
|
|
|
|
$(OUTPUT)%.o: %.S FORCE
|
|
$(call rule_mkdir)
|
|
$(call if_changed_dep,cc_o_c)
|
|
|
|
$(OUTPUT)%.i: %.c FORCE
|
|
$(call rule_mkdir)
|
|
$(call if_changed_dep,cc_i_c)
|
|
|
|
$(OUTPUT)%.i: %.S FORCE
|
|
$(call rule_mkdir)
|
|
$(call if_changed_dep,cc_i_c)
|
|
|
|
$(OUTPUT)%.s: %.c FORCE
|
|
$(call rule_mkdir)
|
|
$(call if_changed_dep,cc_s_c)
|
|
|
|
# Gather build data:
|
|
# obj-y - list of build objects
|
|
# subdir-y - list of directories to nest
|
|
# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
|
|
obj-y := $($(obj)-y)
|
|
subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
|
|
obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
|
|
subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
|
|
|
|
# '$(OUTPUT)/dir' prefix to all objects
|
|
prefix := $(subst ./,,$(OUTPUT)$(dir)/)
|
|
obj-y := $(addprefix $(prefix),$(obj-y))
|
|
subdir-obj-y := $(addprefix $(prefix),$(subdir-obj-y))
|
|
|
|
# Final '$(obj)-in.o' object
|
|
in-target := $(prefix)$(obj)-in.o
|
|
|
|
PHONY += $(subdir-y)
|
|
|
|
$(subdir-y):
|
|
$(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
|
|
|
|
$(sort $(subdir-obj-y)): $(subdir-y) ;
|
|
|
|
$(in-target): $(obj-y) FORCE
|
|
$(call rule_mkdir)
|
|
$(call if_changed,ld_multi)
|
|
|
|
__build: $(in-target)
|
|
@:
|
|
|
|
PHONY += FORCE
|
|
FORCE:
|
|
|
|
# Include all cmd files to get all the dependency rules
|
|
# for all objects included
|
|
targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
|
|
cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
|
|
|
|
ifneq ($(cmd_files),)
|
|
include $(cmd_files)
|
|
endif
|
|
|
|
.PHONY: $(PHONY)
|