1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun### 3*4882a593Smuzhiyun# Main build makefile. 4*4882a593Smuzhiyun# 5*4882a593Smuzhiyun# Lots of this code have been borrowed or heavily inspired from parts 6*4882a593Smuzhiyun# of kbuild code, which is not credited, but mostly developed by: 7*4882a593Smuzhiyun# 8*4882a593Smuzhiyun# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015 9*4882a593Smuzhiyun# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015 10*4882a593Smuzhiyun# 11*4882a593Smuzhiyun 12*4882a593SmuzhiyunPHONY := __build 13*4882a593Smuzhiyun__build: 14*4882a593Smuzhiyun 15*4882a593Smuzhiyunifeq ($(V),1) 16*4882a593Smuzhiyun quiet = 17*4882a593Smuzhiyun Q = 18*4882a593Smuzhiyunelse 19*4882a593Smuzhiyun quiet=quiet_ 20*4882a593Smuzhiyun Q=@ 21*4882a593Smuzhiyunendif 22*4882a593Smuzhiyun 23*4882a593Smuzhiyunifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 24*4882a593Smuzhiyun quiet=silent_ 25*4882a593Smuzhiyunendif 26*4882a593Smuzhiyun 27*4882a593Smuzhiyunbuild-dir := $(srctree)/tools/build 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun# Define $(fixdep) for dep-cmd function 30*4882a593Smuzhiyunifeq ($(OUTPUT),) 31*4882a593Smuzhiyun fixdep := $(build-dir)/fixdep 32*4882a593Smuzhiyunelse 33*4882a593Smuzhiyun fixdep := $(OUTPUT)/fixdep 34*4882a593Smuzhiyunendif 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun# Generic definitions 37*4882a593Smuzhiyuninclude $(build-dir)/Build.include 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun# do not force detected configuration 40*4882a593Smuzhiyun-include $(OUTPUT).config-detected 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun# Init all relevant variables used in build files so 43*4882a593Smuzhiyun# 1) they have correct type 44*4882a593Smuzhiyun# 2) they do not inherit any value from the environment 45*4882a593Smuzhiyunsubdir-y := 46*4882a593Smuzhiyunobj-y := 47*4882a593Smuzhiyunsubdir-y := 48*4882a593Smuzhiyunsubdir-obj-y := 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun# Build definitions 51*4882a593Smuzhiyunbuild-file := $(dir)/Build 52*4882a593Smuzhiyun-include $(build-file) 53*4882a593Smuzhiyun 54*4882a593Smuzhiyunquiet_cmd_flex = FLEX $@ 55*4882a593Smuzhiyunquiet_cmd_bison = BISON $@ 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun# Create directory unless it exists 58*4882a593Smuzhiyunquiet_cmd_mkdir = MKDIR $(dir $@) 59*4882a593Smuzhiyun cmd_mkdir = mkdir -p $(dir $@) 60*4882a593Smuzhiyun rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun# Compile command 63*4882a593Smuzhiyunquiet_cmd_cc_o_c = CC $@ 64*4882a593Smuzhiyun cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 65*4882a593Smuzhiyun 66*4882a593Smuzhiyunquiet_cmd_host_cc_o_c = HOSTCC $@ 67*4882a593Smuzhiyun cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $< 68*4882a593Smuzhiyun 69*4882a593Smuzhiyunquiet_cmd_cxx_o_c = CXX $@ 70*4882a593Smuzhiyun cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $< 71*4882a593Smuzhiyun 72*4882a593Smuzhiyunquiet_cmd_cpp_i_c = CPP $@ 73*4882a593Smuzhiyun cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $< 74*4882a593Smuzhiyun 75*4882a593Smuzhiyunquiet_cmd_cc_s_c = AS $@ 76*4882a593Smuzhiyun cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< 77*4882a593Smuzhiyun 78*4882a593Smuzhiyunquiet_cmd_gen = GEN $@ 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun# Link agregate command 81*4882a593Smuzhiyun# If there's nothing to link, create empty $@ object. 82*4882a593Smuzhiyunquiet_cmd_ld_multi = LD $@ 83*4882a593Smuzhiyun cmd_ld_multi = $(if $(strip $(obj-y)),\ 84*4882a593Smuzhiyun $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) 85*4882a593Smuzhiyun 86*4882a593Smuzhiyunquiet_cmd_host_ld_multi = HOSTLD $@ 87*4882a593Smuzhiyun cmd_host_ld_multi = $(if $(strip $(obj-y)),\ 88*4882a593Smuzhiyun $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) 89*4882a593Smuzhiyun 90*4882a593Smuzhiyunifneq ($(filter $(obj),$(hostprogs)),) 91*4882a593Smuzhiyun host = host_ 92*4882a593Smuzhiyunendif 93*4882a593Smuzhiyun 94*4882a593Smuzhiyun# Build rules 95*4882a593Smuzhiyun$(OUTPUT)%.o: %.c FORCE 96*4882a593Smuzhiyun $(call rule_mkdir) 97*4882a593Smuzhiyun $(call if_changed_dep,$(host)cc_o_c) 98*4882a593Smuzhiyun 99*4882a593Smuzhiyun$(OUTPUT)%.o: %.cpp FORCE 100*4882a593Smuzhiyun $(call rule_mkdir) 101*4882a593Smuzhiyun $(call if_changed_dep,cxx_o_c) 102*4882a593Smuzhiyun 103*4882a593Smuzhiyun$(OUTPUT)%.o: %.S FORCE 104*4882a593Smuzhiyun $(call rule_mkdir) 105*4882a593Smuzhiyun $(call if_changed_dep,$(host)cc_o_c) 106*4882a593Smuzhiyun 107*4882a593Smuzhiyun$(OUTPUT)%.i: %.c FORCE 108*4882a593Smuzhiyun $(call rule_mkdir) 109*4882a593Smuzhiyun $(call if_changed_dep,cpp_i_c) 110*4882a593Smuzhiyun 111*4882a593Smuzhiyun$(OUTPUT)%.s: %.S FORCE 112*4882a593Smuzhiyun $(call rule_mkdir) 113*4882a593Smuzhiyun $(call if_changed_dep,cpp_i_c) 114*4882a593Smuzhiyun 115*4882a593Smuzhiyun$(OUTPUT)%.s: %.c FORCE 116*4882a593Smuzhiyun $(call rule_mkdir) 117*4882a593Smuzhiyun $(call if_changed_dep,cc_s_c) 118*4882a593Smuzhiyun 119*4882a593Smuzhiyun# Gather build data: 120*4882a593Smuzhiyun# obj-y - list of build objects 121*4882a593Smuzhiyun# subdir-y - list of directories to nest 122*4882a593Smuzhiyun# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' 123*4882a593Smuzhiyunobj-y := $($(obj)-y) 124*4882a593Smuzhiyunsubdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 125*4882a593Smuzhiyunobj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) 126*4882a593Smuzhiyunsubdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) 127*4882a593Smuzhiyun 128*4882a593Smuzhiyun# '$(OUTPUT)/dir' prefix to all objects 129*4882a593Smuzhiyunobjprefix := $(subst ./,,$(OUTPUT)$(dir)/) 130*4882a593Smuzhiyunobj-y := $(addprefix $(objprefix),$(obj-y)) 131*4882a593Smuzhiyunsubdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) 132*4882a593Smuzhiyun 133*4882a593Smuzhiyun# Final '$(obj)-in.o' object 134*4882a593Smuzhiyunin-target := $(objprefix)$(obj)-in.o 135*4882a593Smuzhiyun 136*4882a593SmuzhiyunPHONY += $(subdir-y) 137*4882a593Smuzhiyun 138*4882a593Smuzhiyun$(subdir-y): 139*4882a593Smuzhiyun $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) 140*4882a593Smuzhiyun 141*4882a593Smuzhiyun$(sort $(subdir-obj-y)): $(subdir-y) ; 142*4882a593Smuzhiyun 143*4882a593Smuzhiyun$(in-target): $(obj-y) FORCE 144*4882a593Smuzhiyun $(call rule_mkdir) 145*4882a593Smuzhiyun $(call if_changed,$(host)ld_multi) 146*4882a593Smuzhiyun 147*4882a593Smuzhiyun__build: $(in-target) 148*4882a593Smuzhiyun @: 149*4882a593Smuzhiyun 150*4882a593SmuzhiyunPHONY += FORCE 151*4882a593SmuzhiyunFORCE: 152*4882a593Smuzhiyun 153*4882a593Smuzhiyun# Include all cmd files to get all the dependency rules 154*4882a593Smuzhiyun# for all objects included 155*4882a593Smuzhiyuntargets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) 156*4882a593Smuzhiyuncmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 157*4882a593Smuzhiyun 158*4882a593Smuzhiyunifneq ($(cmd_files),) 159*4882a593Smuzhiyun include $(cmd_files) 160*4882a593Smuzhiyunendif 161*4882a593Smuzhiyun 162*4882a593Smuzhiyun.PHONY: $(PHONY) 163