1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
3 # Building binaries on the host system
4 # Binaries are used during the compilation of the kernel, for example
5 # to preprocess a data file.
7 # Both C and C++ are supported, but preferred language is C for such utilities.
9 # Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
10 # hostprogs-y := bin2hex
11 # Will compile bin2hex.c and create an executable named bin2hex
13 # hostprogs-y := lxdialog
14 # lxdialog-objs := checklist.o lxdialog.o
15 # Will compile lxdialog.c and checklist.c, and then link the executable
16 # lxdialog, based on checklist.o and lxdialog.o
18 # hostprogs-y := qconf
19 # qconf-cxxobjs := qconf.o
20 # qconf-objs := menu.o
21 # Will compile qconf as a C++ program, and menu as a C program.
22 # They are linked as C++ code to the executable qconf
24 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
25 host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
26 host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
29 # Executables compiled from a single .c file
30 host-csingle := $(foreach m,$(__hostprogs), \
31 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
33 # C executables linked based on several .o files
34 host-cmulti := $(foreach m,$(__hostprogs),\
35 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
37 # Object (.o) files compiled from .c files
38 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
41 # C++ executables compiled from at least one .cc file
42 # and zero or more .c files
43 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
45 # C++ Object (.o) files compiled from .cc files
46 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
48 # Object (.o) files used by the shared libaries
49 host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
50 host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
52 # output directory for programs/.o files
53 # hostprogs-y := tools/build may have been specified.
54 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
55 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
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-cshlib := $(addprefix $(obj)/,$(host-cshlib))
67 host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
68 host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
69 host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
70 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
72 obj-dirs += $(host-objdirs)
75 # Handle options to gcc. Support building with separate output directory
77 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
78 $(HOSTCFLAGS_$(basetarget).o)
79 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
80 $(HOSTCXXFLAGS_$(basetarget).o)
83 __hostc_flags = $(_hostc_flags)
84 __hostcxx_flags = $(_hostcxx_flags)
86 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
87 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
90 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
91 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
94 # Compile programs on the host
96 # Create executable from a single .c file
97 # host-csingle -> Executable
98 quiet_cmd_host-csingle = HOSTCC $@
99 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
100 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
101 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
102 $(call if_changed_dep,host-csingle)
104 # Link an executable based on list of .o files, all plain c
105 # host-cmulti -> executable
106 quiet_cmd_host-cmulti = HOSTLD $@
107 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
108 $(addprefix $(obj)/,$($(@F)-objs)) \
109 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
110 $(host-cmulti): FORCE
111 $(call if_changed,host-cmulti)
112 $(call multi_depend, $(host-cmulti), , -objs)
114 # Create .o file from a single .c file
116 quiet_cmd_host-cobjs = HOSTCC $@
117 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
118 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
119 $(call if_changed_dep,host-cobjs)
121 # Link an executable based on list of .o files, a mixture of .c and .cc
122 # host-cxxmulti -> executable
123 quiet_cmd_host-cxxmulti = HOSTLD $@
124 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
125 $(foreach o,objs cxxobjs,\
126 $(addprefix $(obj)/,$($(@F)-$(o)))) \
127 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
128 $(host-cxxmulti): FORCE
129 $(call if_changed,host-cxxmulti)
130 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
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): $(obj)/%.o: $(src)/%.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): $(obj)/%.o: $(src)/%.c FORCE
143 $(call if_changed_dep,host-cshobjs)
145 # Compile .c file, create position independent .o file
146 # Note that plugin capable gcc versions can be either C or C++ based
147 # therefore plugin source files have to be compilable in both C and C++ mode.
148 # This is why a C++ compiler is invoked on a .c file.
149 # host-cxxshobjs -> .o
150 quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@
151 cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
152 $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
153 $(call if_changed_dep,host-cxxshobjs)
155 # Link a shared library, based on position independent .o files
156 # *.o -> .so shared library (host-cshlib)
157 quiet_cmd_host-cshlib = HOSTLLD -shared $@
158 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
159 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
160 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
161 $(host-cshlib): FORCE
162 $(call if_changed,host-cshlib)
163 $(call multi_depend, $(host-cshlib), .so, -objs)
165 # Link a shared library, based on position independent .o files
166 # *.o -> .so shared library (host-cxxshlib)
167 quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
168 cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
169 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
170 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
171 $(host-cxxshlib): FORCE
172 $(call if_changed,host-cxxshlib)
173 $(call multi_depend, $(host-cxxshlib), .so, -objs)
175 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
176 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)