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))
35 # hostprogs-y := tools/build may have been specified. Retreive directory
36 obj-dirs += $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
37 obj-dirs := $(strip $(sort $(filter-out ./,$(obj-dirs))))
41 # Executables compiled from a single .c file
42 host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
44 # C executables linked based on several .o files
45 host-cmulti := $(foreach m,$(__hostprogs),\
46 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
48 # Object (.o) files compiled from .c files
49 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
52 # C++ executables compiled from at least on .cc file
53 # and zero or more .c files
54 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
56 # C++ Object (.o) files compiled from .cc files
57 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
59 # Shared libaries (only .c supported)
60 # Shared libraries (.so) - all .so files referenced in "xxx-objs"
61 host-cshlib := $(sort $(filter %.so, $(host-cobjs)))
62 # Remove .so files from "xxx-objs"
63 host-cobjs := $(filter-out %.so,$(host-cobjs))
65 #Object (.o) files used by the shared libaries
66 host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
68 __hostprogs := $(addprefix $(obj)/,$(__hostprogs))
69 host-csingle := $(addprefix $(obj)/,$(host-csingle))
70 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
71 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
72 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
73 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
74 host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
75 host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
76 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
79 # Handle options to gcc. Support building with separate output directory
81 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS_$(*F).o)
82 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) $(HOSTCXXFLAGS_$(*F).o)
85 __hostc_flags = $(_hostc_flags)
86 __hostcxx_flags = $(_hostcxx_flags)
88 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
89 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
92 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
93 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
96 # Compile programs on the host
98 # Create executable from a single .c file
99 # host-csingle -> Executable
100 quiet_cmd_host-csingle = HOSTCC $@
101 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
102 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
103 $(host-csingle): %: %.c FORCE
104 $(call if_changed_dep,host-csingle)
106 # Link an executable based on list of .o files, all plain c
107 # host-cmulti -> executable
108 quiet_cmd_host-cmulti = HOSTLD $@
109 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
110 $(addprefix $(obj)/,$($(@F)-objs)) \
111 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
112 $(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
113 $(call if_changed,host-cmulti)
115 # Create .o file from a single .c file
117 quiet_cmd_host-cobjs = HOSTCC $@
118 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
119 $(host-cobjs): %.o: %.c FORCE
120 $(call if_changed_dep,host-cobjs)
122 # Link an executable based on list of .o files, a mixture of .c and .cc
123 # host-cxxmulti -> executable
124 quiet_cmd_host-cxxmulti = HOSTLD $@
125 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
126 $(foreach o,objs cxxobjs,\
127 $(addprefix $(obj)/,$($(@F)-$(o)))) \
128 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
129 $(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
130 $(call if_changed,host-cxxmulti)
132 # Create .o file from a single .cc (C++) file
133 quiet_cmd_host-cxxobjs = HOSTCXX $@
134 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
135 $(host-cxxobjs): %.o: %.cc FORCE
136 $(call if_changed_dep,host-cxxobjs)
138 # Compile .c file, create position independent .o file
140 quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
141 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
142 $(host-cshobjs): %.o: %.c FORCE
143 $(call if_changed_dep,host-cshobjs)
145 # Link a shared library, based on position independent .o files
146 # *.o -> .so shared library (host-cshlib)
147 quiet_cmd_host-cshlib = HOSTLLD -shared $@
148 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
149 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
150 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
151 $(host-cshlib): %: $(host-cshobjs) FORCE
152 $(call if_changed,host-cshlib)
154 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
155 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)