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.
6 # Both C and C++ is supported, but preferred language is C for such utilities.
8 # Samle syntax (see Documentation/kbuild/makefile.txt for reference)
9 # hostprogs-y := bin2hex
10 # Will compile bin2hex.c and create an executable named bin2hex
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
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
24 # conf-objs := conf.o libkconfig.so
25 # libkconfig-objs := expr.o type.o
26 # Will create a shared library named libkconfig.so that consist of
27 # expr.o and type.o (they are both compiled as C code and the object file
28 # are made as position independent code).
29 # conf.c is compiled as a c program, and conf.o is linked together with
30 # libkconfig.so as the executable conf.
31 # Note: Shared libraries consisting of C++ files are not supported
33 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
36 # Executables compiled from a single .c file
37 host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
39 # C executables linked based on several .o files
40 host-cmulti := $(foreach m,$(__hostprogs),\
41 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
43 # Object (.o) files compiled from .c files
44 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
47 # C++ executables compiled from at least on .cc file
48 # and zero or more .c files
49 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
51 # C++ Object (.o) files compiled from .cc files
52 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
54 # Shared libaries (only .c supported)
55 # Shared libraries (.so) - all .so files referenced in "xxx-objs"
56 host-cshlib := $(sort $(filter %.so, $(host-cobjs)))
57 # Remove .so files from "xxx-objs"
58 host-cobjs := $(filter-out %.so,$(host-cobjs))
60 #Object (.o) files used by the shared libaries
61 host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
63 # output directory for programs/.o files
64 # hostprogs-y := tools/build may have been specified. Retreive directory
65 host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
66 # directory of .o files from prog-objs notation
67 host-objdirs += $(foreach f,$(host-cmulti), \
68 $(foreach m,$($(f)-objs), \
69 $(if $(dir $(m)),$(dir $(m)))))
70 # directory of .o files from prog-cxxobjs notation
71 host-objdirs += $(foreach f,$(host-cxxmulti), \
72 $(foreach m,$($(f)-cxxobjs), \
73 $(if $(dir $(m)),$(dir $(m)))))
75 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
78 __hostprogs := $(addprefix $(obj)/,$(__hostprogs))
79 host-csingle := $(addprefix $(obj)/,$(host-csingle))
80 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
81 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
82 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
83 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
84 host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
85 host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
86 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
88 obj-dirs += $(host-objdirs)
91 # Handle options to gcc. Support building with separate output directory
93 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
94 $(HOSTCFLAGS_$(basetarget).o)
95 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
96 $(HOSTCXXFLAGS_$(basetarget).o)
99 __hostc_flags = $(_hostc_flags)
100 __hostcxx_flags = $(_hostcxx_flags)
102 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
103 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
106 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
107 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
110 # Compile programs on the host
112 # Create executable from a single .c file
113 # host-csingle -> Executable
114 quiet_cmd_host-csingle = HOSTCC $@
115 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
116 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
117 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
118 $(call if_changed_dep,host-csingle)
120 # Link an executable based on list of .o files, all plain c
121 # host-cmulti -> executable
122 quiet_cmd_host-cmulti = HOSTLD $@
123 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
124 $(addprefix $(obj)/,$($(@F)-objs)) \
125 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
126 $(host-cmulti): $(obj)/%: $(host-cobjs) $(host-cshlib) FORCE
127 $(call if_changed,host-cmulti)
129 # Create .o file from a single .c file
131 quiet_cmd_host-cobjs = HOSTCC $@
132 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
133 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
134 $(call if_changed_dep,host-cobjs)
136 # Link an executable based on list of .o files, a mixture of .c and .cc
137 # host-cxxmulti -> executable
138 quiet_cmd_host-cxxmulti = HOSTLD $@
139 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
140 $(foreach o,objs cxxobjs,\
141 $(addprefix $(obj)/,$($(@F)-$(o)))) \
142 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
143 $(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
144 $(call if_changed,host-cxxmulti)
146 # Create .o file from a single .cc (C++) file
147 quiet_cmd_host-cxxobjs = HOSTCXX $@
148 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
149 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
150 $(call if_changed_dep,host-cxxobjs)
152 # Compile .c file, create position independent .o file
154 quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
155 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
156 $(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
157 $(call if_changed_dep,host-cshobjs)
159 # Link a shared library, based on position independent .o files
160 # *.o -> .so shared library (host-cshlib)
161 quiet_cmd_host-cshlib = HOSTLLD -shared $@
162 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
163 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
164 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
165 $(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE
166 $(call if_changed,host-cshlib)
168 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
169 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)