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++ are supported, but preferred language is C for such utilities.
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
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
23 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
26 # Executables compiled from a single .c file
27 host-csingle := $(foreach m,$(__hostprogs), \
28 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
30 # C executables linked based on several .o files
31 host-cmulti := $(foreach m,$(__hostprogs),\
32 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
34 # Object (.o) files compiled from .c files
35 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
38 # C++ executables compiled from at least one .cc file
39 # and zero or more .c files
40 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
42 # C++ Object (.o) files compiled from .cc files
43 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
45 # output directory for programs/.o files
46 # hostprogs-y := tools/build may have been specified. Retrieve directory
47 host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
48 # directory of .o files from prog-objs notation
49 host-objdirs += $(foreach f,$(host-cmulti), \
50 $(foreach m,$($(f)-objs), \
51 $(if $(dir $(m)),$(dir $(m)))))
52 # directory of .o files from prog-cxxobjs notation
53 host-objdirs += $(foreach f,$(host-cxxmulti), \
54 $(foreach m,$($(f)-cxxobjs), \
55 $(if $(dir $(m)),$(dir $(m)))))
57 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
60 __hostprogs := $(addprefix $(obj)/,$(__hostprogs))
61 host-csingle := $(addprefix $(obj)/,$(host-csingle))
62 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
63 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
64 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
65 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
66 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
68 obj-dirs += $(host-objdirs)
71 # Handle options to gcc. Support building with separate output directory
73 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
74 $(HOSTCFLAGS_$(basetarget).o)
75 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
76 $(HOSTCXXFLAGS_$(basetarget).o)
79 __hostc_flags = $(_hostc_flags)
80 __hostcxx_flags = $(_hostcxx_flags)
82 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
83 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
86 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
87 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
90 # Compile programs on the host
92 # Create executable from a single .c file
93 # host-csingle -> Executable
94 quiet_cmd_host-csingle = HOSTCC $@
95 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
96 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
97 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
98 $(call if_changed_dep,host-csingle)
100 # Link an executable based on list of .o files, all plain c
101 # host-cmulti -> executable
102 quiet_cmd_host-cmulti = HOSTLD $@
103 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
104 $(addprefix $(obj)/,$($(@F)-objs)) \
105 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
106 $(host-cmulti): $(obj)/%: $(host-cobjs) FORCE
107 $(call if_changed,host-cmulti)
109 # Create .o file from a single .c file
111 quiet_cmd_host-cobjs = HOSTCC $@
112 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
113 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
114 $(call if_changed_dep,host-cobjs)
116 # Link an executable based on list of .o files, a mixture of .c and .cc
117 # host-cxxmulti -> executable
118 quiet_cmd_host-cxxmulti = HOSTLD $@
119 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
120 $(foreach o,objs cxxobjs,\
121 $(addprefix $(obj)/,$($(@F)-$(o)))) \
122 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
123 $(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) FORCE
124 $(call if_changed,host-cxxmulti)
126 # Create .o file from a single .cc (C++) file
127 quiet_cmd_host-cxxobjs = HOSTCXX $@
128 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
129 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
130 $(call if_changed_dep,host-cxxobjs)
132 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
133 $(host-cxxmulti) $(host-cxxobjs)