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1 # ==========================================================================
2 # Building binaries on the host system
3 # Binaries are used during the compilation of the kernel, for example
4 # to preprocess a data file.
5 #
6 # Both C and C++ are supported, but preferred language is C for such utilities.
7 #
8 # Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
9 # hostprogs-y := bin2hex
10 # Will compile bin2hex.c and create an executable named bin2hex
11 #
12 # hostprogs-y := lxdialog
13 # lxdialog-objs := checklist.o lxdialog.o
14 # Will compile lxdialog.c and checklist.c, and then link the executable
15 # lxdialog, based on checklist.o and lxdialog.o
16 #
17 # hostprogs-y := qconf
18 # qconf-cxxobjs := qconf.o
19 # qconf-objs := menu.o
20 # Will compile qconf as a C++ program, and menu as a C program.
21 # They are linked as C++ code to the executable qconf
22
23 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
24 host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
25 host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
26
27 # C code
28 # Executables compiled from a single .c file
29 host-csingle := $(foreach m,$(__hostprogs), \
30 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
31
32 # C executables linked based on several .o files
33 host-cmulti := $(foreach m,$(__hostprogs),\
34 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
35
36 # Object (.o) files compiled from .c files
37 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
38
39 # C++ code
40 # C++ executables compiled from at least one .cc file
41 # and zero or more .c files
42 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
43
44 # C++ Object (.o) files compiled from .cc files
45 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
46
47 # Object (.o) files used by the shared libaries
48 host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
49 host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
50
51 # output directory for programs/.o files
52 # hostprogs-y := tools/build may have been specified.
53 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
54 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
55
56 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
57
58
59 __hostprogs := $(addprefix $(obj)/,$(__hostprogs))
60 host-csingle := $(addprefix $(obj)/,$(host-csingle))
61 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
62 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
63 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
64 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
65 host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
66 host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
67 host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
68 host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
69 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
70
71 obj-dirs += $(host-objdirs)
72
73 #####
74 # Handle options to gcc. Support building with separate output directory
75
76 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
77 $(HOSTCFLAGS_$(basetarget).o)
78 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
79 $(HOSTCXXFLAGS_$(basetarget).o)
80
81 ifeq ($(KBUILD_SRC),)
82 __hostc_flags = $(_hostc_flags)
83 __hostcxx_flags = $(_hostcxx_flags)
84 else
85 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
86 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
87 endif
88
89 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
90 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
91
92 #####
93 # Compile programs on the host
94
95 # Create executable from a single .c file
96 # host-csingle -> Executable
97 quiet_cmd_host-csingle = HOSTCC $@
98 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
99 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
100 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
101 $(call if_changed_dep,host-csingle)
102
103 # Link an executable based on list of .o files, all plain c
104 # host-cmulti -> executable
105 quiet_cmd_host-cmulti = HOSTLD $@
106 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
107 $(addprefix $(obj)/,$($(@F)-objs)) \
108 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
109 $(host-cmulti): FORCE
110 $(call if_changed,host-cmulti)
111 $(call multi_depend, $(host-cmulti), , -objs)
112
113 # Create .o file from a single .c file
114 # host-cobjs -> .o
115 quiet_cmd_host-cobjs = HOSTCC $@
116 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
117 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
118 $(call if_changed_dep,host-cobjs)
119
120 # Link an executable based on list of .o files, a mixture of .c and .cc
121 # host-cxxmulti -> executable
122 quiet_cmd_host-cxxmulti = HOSTLD $@
123 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
124 $(foreach o,objs cxxobjs,\
125 $(addprefix $(obj)/,$($(@F)-$(o)))) \
126 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
127 $(host-cxxmulti): FORCE
128 $(call if_changed,host-cxxmulti)
129 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
130
131 # Create .o file from a single .cc (C++) file
132 quiet_cmd_host-cxxobjs = HOSTCXX $@
133 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
134 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
135 $(call if_changed_dep,host-cxxobjs)
136
137 # Compile .c file, create position independent .o file
138 # host-cshobjs -> .o
139 quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
140 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
141 $(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
142 $(call if_changed_dep,host-cshobjs)
143
144 # Compile .c file, create position independent .o file
145 # Note that plugin capable gcc versions can be either C or C++ based
146 # therefore plugin source files have to be compilable in both C and C++ mode.
147 # This is why a C++ compiler is invoked on a .c file.
148 # host-cxxshobjs -> .o
149 quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@
150 cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
151 $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
152 $(call if_changed_dep,host-cxxshobjs)
153
154 # Link a shared library, based on position independent .o files
155 # *.o -> .so shared library (host-cshlib)
156 quiet_cmd_host-cshlib = HOSTLLD -shared $@
157 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
158 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
159 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
160 $(host-cshlib): FORCE
161 $(call if_changed,host-cshlib)
162 $(call multi_depend, $(host-cshlib), .so, -objs)
163
164 # Link a shared library, based on position independent .o files
165 # *.o -> .so shared library (host-cxxshlib)
166 quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
167 cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
168 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
169 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
170 $(host-cxxshlib): FORCE
171 $(call if_changed,host-cxxshlib)
172 $(call multi_depend, $(host-cxxshlib), .so, -objs)
173
174 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
175 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)