xref: /openbmc/linux/tools/build/Makefile.build (revision 9235756885e865070c4be2facda75262dbd85967)
1 # SPDX-License-Identifier: GPL-2.0
2 ###
3 # Main build makefile.
4 #
5 #  Lots of this code have been borrowed or heavily inspired from parts
6 #  of kbuild code, which is not credited, but mostly developed by:
7 #
8 #  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
9 #  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
10 #
11 
12 PHONY := __build
13 __build:
14 
15 ifeq ($(V),1)
16   quiet =
17   Q =
18 else
19   quiet=quiet_
20   Q=@
21 endif
22 
23 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
24   quiet=silent_
25 endif
26 
27 build-dir := $(srctree)/tools/build
28 
29 # Define $(fixdep) for dep-cmd function
30 ifeq ($(OUTPUT),)
31   fixdep := $(build-dir)/fixdep
32 else
33   fixdep := $(OUTPUT)/fixdep
34 endif
35 
36 # Generic definitions
37 include $(build-dir)/Build.include
38 
39 # do not force detected configuration
40 -include $(OUTPUT).config-detected
41 
42 # Init all relevant variables used in build files so
43 # 1) they have correct type
44 # 2) they do not inherit any value from the environment
45 subdir-y     :=
46 obj-y        :=
47 subdir-y     :=
48 subdir-obj-y :=
49 
50 # Build definitions
51 build-file := $(dir)/Build
52 -include $(build-file)
53 
54 quiet_cmd_flex  = FLEX    $@
55 quiet_cmd_bison = BISON   $@
56 quiet_cmd_test  = TEST    $@
57 
58 # Create directory unless it exists
59 quiet_cmd_mkdir = MKDIR   $(dir $@)
60       cmd_mkdir = mkdir -p $(dir $@)
61      rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
62 
63 # Compile command
64 quiet_cmd_cc_o_c = CC      $@
65       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
66 
67 quiet_cmd_host_cc_o_c = HOSTCC  $@
68       cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
69 
70 quiet_cmd_cxx_o_c = CXX     $@
71       cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
72 
73 quiet_cmd_cpp_i_c = CPP     $@
74       cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
75 
76 quiet_cmd_cc_s_c = AS      $@
77       cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
78 
79 quiet_cmd_gen = GEN     $@
80 
81 # Link agregate command
82 # If there's nothing to link, create empty $@ object.
83 quiet_cmd_ld_multi = LD      $@
84       cmd_ld_multi = $(if $(strip $(obj-y)),\
85                      $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
86 
87 quiet_cmd_host_ld_multi = HOSTLD  $@
88       cmd_host_ld_multi = $(if $(strip $(obj-y)),\
89                           $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
90 
91 ifneq ($(filter $(obj),$(hostprogs)),)
92   host = host_
93 endif
94 
95 # Build rules
96 $(OUTPUT)%.o: %.c FORCE
97 	$(call rule_mkdir)
98 	$(call if_changed_dep,$(host)cc_o_c)
99 
100 $(OUTPUT)%.o: %.cpp FORCE
101 	$(call rule_mkdir)
102 	$(call if_changed_dep,cxx_o_c)
103 
104 $(OUTPUT)%.o: %.S FORCE
105 	$(call rule_mkdir)
106 	$(call if_changed_dep,$(host)cc_o_c)
107 
108 $(OUTPUT)%.i: %.c FORCE
109 	$(call rule_mkdir)
110 	$(call if_changed_dep,cpp_i_c)
111 
112 $(OUTPUT)%.s: %.S FORCE
113 	$(call rule_mkdir)
114 	$(call if_changed_dep,cpp_i_c)
115 
116 $(OUTPUT)%.s: %.c FORCE
117 	$(call rule_mkdir)
118 	$(call if_changed_dep,cc_s_c)
119 
120 # Gather build data:
121 #   obj-y        - list of build objects
122 #   subdir-y     - list of directories to nest
123 #   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
124 obj-y        := $($(obj)-y)
125 subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
126 obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
127 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
128 
129 # '$(OUTPUT)/dir' prefix to all objects
130 objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
131 obj-y        := $(addprefix $(objprefix),$(obj-y))
132 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
133 
134 # Final '$(obj)-in.o' object
135 in-target := $(objprefix)$(obj)-in.o
136 
137 PHONY += $(subdir-y)
138 
139 $(subdir-y):
140 	$(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
141 
142 $(sort $(subdir-obj-y)): $(subdir-y) ;
143 
144 $(in-target): $(obj-y) FORCE
145 	$(call rule_mkdir)
146 	$(call if_changed,$(host)ld_multi)
147 
148 __build: $(in-target)
149 	@:
150 
151 PHONY += FORCE
152 FORCE:
153 
154 # Include all cmd files to get all the dependency rules
155 # for all objects included
156 targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
157 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
158 
159 ifneq ($(cmd_files),)
160   include $(cmd_files)
161 endif
162 
163 .PHONY: $(PHONY)
164