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))
27 # Executables compiled from a single .c file
28 host-csingle := $(foreach m,$(__hostprogs), \
29 $(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-sharedobjs),,$(m)))
31 # C executables linked based on several .o files
32 host-cmulti := $(foreach m,$(__hostprogs),\
33 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
35 # Shared object libraries
36 host-shared := $(foreach m,$(__hostprogs),\
37 $(if $($(m)-sharedobjs),$(m))))
39 # Object (.o) files compiled from .c files
40 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
43 # C++ executables compiled from at least one .cc file
44 # and zero or more .c files
45 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
47 # C++ Object (.o) files compiled from .cc files
48 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
50 # output directory for programs/.o files
51 # hostprogs-y := tools/build may have been specified.
52 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
53 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
55 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
58 __hostprogs := $(addprefix $(obj)/,$(__hostprogs))
59 host-csingle := $(addprefix $(obj)/,$(host-csingle))
60 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
61 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
62 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
63 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
64 host-shared := $(addprefix $(obj)/,$(host-shared))
65 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
67 obj-dirs += $(host-objdirs)
70 # Handle options to gcc. Support building with separate output directory
72 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
73 $(HOSTCFLAGS_$(basetarget).o)
74 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
75 $(HOSTCXXFLAGS_$(basetarget).o)
78 __hostc_flags = $(_hostc_flags)
79 __hostcxx_flags = $(_hostcxx_flags)
81 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
82 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
85 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
86 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
89 # Compile programs on the host
91 # Create executable from a single .c file
92 # host-csingle -> Executable
93 quiet_cmd_host-csingle = HOSTCC $@
94 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
95 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
96 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
97 $(call if_changed_dep,host-csingle)
99 # Link an executable based on list of .o files, all plain c
100 # host-cmulti -> executable
101 quiet_cmd_host-cmulti = HOSTLD $@
102 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
103 $(addprefix $(obj)/,$($(@F)-objs)) \
104 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
105 $(host-cmulti): FORCE
106 $(call if_changed,host-cmulti)
107 $(call multi_depend, $(host-cmulti), , -objs)
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): FORCE
124 $(call if_changed,host-cxxmulti)
125 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
127 # Create .o file from a single .cc (C++) file
128 quiet_cmd_host-cxxobjs = HOSTCXX $@
129 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
130 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
131 $(call if_changed_dep,host-cxxobjs)
133 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
134 $(host-cxxmulti) $(host-cxxobjs) $(host-shared)