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 # SPDX-License-Identifier: GPL-2.0
26 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
29 # Executables compiled from a single .c file
30 host-csingle := $(foreach m,$(__hostprogs), \
31 $(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-sharedobjs),,$(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 # Shared object libraries
38 host-shared := $(foreach m,$(__hostprogs),\
39 $(if $($(m)-sharedobjs),$(m))))
41 # Object (.o) files compiled from .c files
42 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
45 # C++ executables compiled from at least one .cc file
46 # and zero or more .c files
47 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
49 # C++ Object (.o) files compiled from .cc files
50 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
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-shared := $(addprefix $(obj)/,$(host-shared))
67 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
69 obj-dirs += $(host-objdirs)
72 # Handle options to gcc. Support building with separate output directory
74 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
75 $(HOSTCFLAGS_$(basetarget).o)
76 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
77 $(HOSTCXXFLAGS_$(basetarget).o)
80 __hostc_flags = $(_hostc_flags)
81 __hostcxx_flags = $(_hostcxx_flags)
83 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
84 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
87 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
88 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
91 # Compile programs on the host
93 # Create executable from a single .c file
94 # host-csingle -> Executable
95 quiet_cmd_host-csingle = HOSTCC $@
96 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
97 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
98 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
99 $(call if_changed_dep,host-csingle)
101 # Link an executable based on list of .o files, all plain c
102 # host-cmulti -> executable
103 quiet_cmd_host-cmulti = HOSTLD $@
104 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
105 $(addprefix $(obj)/,$($(@F)-objs)) \
106 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
107 $(host-cmulti): FORCE
108 $(call if_changed,host-cmulti)
109 $(call multi_depend, $(host-cmulti), , -objs)
111 # Create .o file from a single .c file
113 quiet_cmd_host-cobjs = HOSTCC $@
114 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
115 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
116 $(call if_changed_dep,host-cobjs)
118 # Link an executable based on list of .o files, a mixture of .c and .cc
119 # host-cxxmulti -> executable
120 quiet_cmd_host-cxxmulti = HOSTLD $@
121 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
122 $(foreach o,objs cxxobjs,\
123 $(addprefix $(obj)/,$($(@F)-$(o)))) \
124 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
125 $(host-cxxmulti): FORCE
126 $(call if_changed,host-cxxmulti)
127 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
129 # Create .o file from a single .cc (C++) file
130 quiet_cmd_host-cxxobjs = HOSTCXX $@
131 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
132 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
133 $(call if_changed_dep,host-cxxobjs)
135 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
136 $(host-cxxmulti) $(host-cxxobjs) $(host-shared)