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.rst 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 host-csingle := $(addprefix $(obj)/,$(host-csingle))
53 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
54 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
55 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
56 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
57 host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
58 host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
59 host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
60 host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
63 # Handle options to gcc. Support building with separate output directory
65 _hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
66 $(HOSTCFLAGS_$(basetarget).o)
67 _hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
68 $(HOSTCXXFLAGS_$(basetarget).o)
70 # $(objtree)/$(obj) for including generated headers from checkin source files
71 ifeq ($(KBUILD_EXTMOD),)
73 _hostc_flags += -I $(objtree)/$(obj)
74 _hostcxx_flags += -I $(objtree)/$(obj)
78 hostc_flags = -Wp,-MD,$(depfile) $(_hostc_flags)
79 hostcxx_flags = -Wp,-MD,$(depfile) $(_hostcxx_flags)
82 # Compile programs on the host
84 # Create executable from a single .c file
85 # host-csingle -> Executable
86 quiet_cmd_host-csingle = HOSTCC $@
87 cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
88 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
89 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
90 $(call if_changed_dep,host-csingle)
92 # Link an executable based on list of .o files, all plain c
93 # host-cmulti -> executable
94 quiet_cmd_host-cmulti = HOSTLD $@
95 cmd_host-cmulti = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
96 $(addprefix $(obj)/,$($(@F)-objs)) \
97 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
99 $(call if_changed,host-cmulti)
100 $(call multi_depend, $(host-cmulti), , -objs)
102 # Create .o file from a single .c file
104 quiet_cmd_host-cobjs = HOSTCC $@
105 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
106 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
107 $(call if_changed_dep,host-cobjs)
109 # Link an executable based on list of .o files, a mixture of .c and .cc
110 # host-cxxmulti -> executable
111 quiet_cmd_host-cxxmulti = HOSTLD $@
112 cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
113 $(foreach o,objs cxxobjs,\
114 $(addprefix $(obj)/,$($(@F)-$(o)))) \
115 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
116 $(host-cxxmulti): FORCE
117 $(call if_changed,host-cxxmulti)
118 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
120 # Create .o file from a single .cc (C++) file
121 quiet_cmd_host-cxxobjs = HOSTCXX $@
122 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
123 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
124 $(call if_changed_dep,host-cxxobjs)
126 # Compile .c file, create position independent .o file
128 quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
129 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
130 $(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
131 $(call if_changed_dep,host-cshobjs)
133 # Compile .c file, create position independent .o file
134 # Note that plugin capable gcc versions can be either C or C++ based
135 # therefore plugin source files have to be compilable in both C and C++ mode.
136 # This is why a C++ compiler is invoked on a .c file.
137 # host-cxxshobjs -> .o
138 quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@
139 cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
140 $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
141 $(call if_changed_dep,host-cxxshobjs)
143 # Link a shared library, based on position independent .o files
144 # *.o -> .so shared library (host-cshlib)
145 quiet_cmd_host-cshlib = HOSTLLD -shared $@
146 cmd_host-cshlib = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
147 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
148 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
149 $(host-cshlib): FORCE
150 $(call if_changed,host-cshlib)
151 $(call multi_depend, $(host-cshlib), .so, -objs)
153 # Link a shared library, based on position independent .o files
154 # *.o -> .so shared library (host-cxxshlib)
155 quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
156 cmd_host-cxxshlib = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
157 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
158 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
159 $(host-cxxshlib): FORCE
160 $(call if_changed,host-cxxshlib)
161 $(call multi_depend, $(host-cxxshlib), .so, -objs)
163 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
164 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)