xref: /openbmc/linux/tools/build/Makefile.build (revision 174cd4b1) 
1###
2# Main build makefile.
3#
4#  Lots of this code have been borrowed or heavily inspired from parts
5#  of kbuild code, which is not credited, but mostly developed by:
6#
7#  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
8#  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
9#
10
11PHONY := __build
12__build:
13
14ifeq ($(V),1)
15  quiet =
16  Q =
17else
18  quiet=quiet_
19  Q=@
20endif
21
22ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
23ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
24  quiet=silent_
25endif
26else					# make-3.8x
27ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
28  quiet=silent_
29endif
30endif
31
32build-dir := $(srctree)/tools/build
33
34# Define $(fixdep) for dep-cmd function
35ifeq ($(OUTPUT),)
36  fixdep := $(build-dir)/fixdep
37else
38  fixdep := $(OUTPUT)/fixdep
39endif
40
41# Generic definitions
42include $(build-dir)/Build.include
43
44# do not force detected configuration
45-include $(OUTPUT).config-detected
46
47# Init all relevant variables used in build files so
48# 1) they have correct type
49# 2) they do not inherit any value from the environment
50subdir-y     :=
51obj-y        :=
52subdir-y     :=
53subdir-obj-y :=
54
55# Build definitions
56build-file := $(dir)/Build
57-include $(build-file)
58
59quiet_cmd_flex  = FLEX     $@
60quiet_cmd_bison = BISON    $@
61
62# Create directory unless it exists
63quiet_cmd_mkdir = MKDIR    $(dir $@)
64      cmd_mkdir = mkdir -p $(dir $@)
65     rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
66
67# Compile command
68quiet_cmd_cc_o_c = CC       $@
69      cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
70
71quiet_cmd_host_cc_o_c = HOSTCC   $@
72      cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
73
74quiet_cmd_cxx_o_c = CXX      $@
75      cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
76
77quiet_cmd_cpp_i_c = CPP      $@
78      cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
79
80quiet_cmd_cc_s_c = AS       $@
81      cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
82
83quiet_cmd_gen = GEN      $@
84
85# Link agregate command
86# If there's nothing to link, create empty $@ object.
87quiet_cmd_ld_multi = LD       $@
88      cmd_ld_multi = $(if $(strip $(obj-y)),\
89                     $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
90
91quiet_cmd_host_ld_multi = HOSTLD   $@
92      cmd_host_ld_multi = $(if $(strip $(obj-y)),\
93                          $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
94
95ifneq ($(filter $(obj),$(hostprogs)),)
96  host = host_
97endif
98
99# Build rules
100$(OUTPUT)%.o: %.c FORCE
101	$(call rule_mkdir)
102	$(call if_changed_dep,$(host)cc_o_c)
103
104$(OUTPUT)%.o: %.cpp FORCE
105	$(call rule_mkdir)
106	$(call if_changed_dep,cxx_o_c)
107
108$(OUTPUT)%.o: %.S FORCE
109	$(call rule_mkdir)
110	$(call if_changed_dep,$(host)cc_o_c)
111
112$(OUTPUT)%.i: %.c FORCE
113	$(call rule_mkdir)
114	$(call if_changed_dep,cpp_i_c)
115
116$(OUTPUT)%.s: %.S FORCE
117	$(call rule_mkdir)
118	$(call if_changed_dep,cpp_i_c)
119
120$(OUTPUT)%.s: %.c FORCE
121	$(call rule_mkdir)
122	$(call if_changed_dep,cc_s_c)
123
124# Gather build data:
125#   obj-y        - list of build objects
126#   subdir-y     - list of directories to nest
127#   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
128obj-y        := $($(obj)-y)
129subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
130obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
131subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
132
133# '$(OUTPUT)/dir' prefix to all objects
134objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
135obj-y        := $(addprefix $(objprefix),$(obj-y))
136subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
137
138# Final '$(obj)-in.o' object
139in-target := $(objprefix)$(obj)-in.o
140
141PHONY += $(subdir-y)
142
143$(subdir-y):
144	$(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
145
146$(sort $(subdir-obj-y)): $(subdir-y) ;
147
148$(in-target): $(obj-y) FORCE
149	$(call rule_mkdir)
150	$(call if_changed,$(host)ld_multi)
151
152__build: $(in-target)
153	@:
154
155PHONY += FORCE
156FORCE:
157
158# Include all cmd files to get all the dependency rules
159# for all objects included
160targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
161cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
162
163ifneq ($(cmd_files),)
164  include $(cmd_files)
165endif
166
167.PHONY: $(PHONY)
168