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)))
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 # output directory for programs/.o files
49 # hostprogs-y := tools/build may have been specified.
50 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
51 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
53 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
56 __hostprogs := $(addprefix $(obj)/,$(__hostprogs))
57 host-csingle := $(addprefix $(obj)/,$(host-csingle))
58 host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
59 host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
60 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
61 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
62 host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
64 obj-dirs += $(host-objdirs)
67 # Handle options to gcc. Support building with separate output directory
69 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
70 $(HOSTCFLAGS_$(basetarget).o)
71 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
72 $(HOSTCXXFLAGS_$(basetarget).o)
75 __hostc_flags = $(_hostc_flags)
76 __hostcxx_flags = $(_hostcxx_flags)
78 __hostc_flags = -I$(obj) $(call flags,_hostc_flags)
79 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
82 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
83 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
86 # Compile programs on the host
88 # Create executable from a single .c file
89 # host-csingle -> Executable
90 quiet_cmd_host-csingle = HOSTCC $@
91 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
92 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
93 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
94 $(call if_changed_dep,host-csingle)
96 # Link an executable based on list of .o files, all plain c
97 # host-cmulti -> executable
98 quiet_cmd_host-cmulti = HOSTLD $@
99 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
100 $(addprefix $(obj)/,$($(@F)-objs)) \
101 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
102 $(host-cmulti): FORCE
103 $(call if_changed,host-cmulti)
104 $(call multi_depend, $(host-cmulti), , -objs)
106 # Create .o file from a single .c file
108 quiet_cmd_host-cobjs = HOSTCC $@
109 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
110 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
111 $(call if_changed_dep,host-cobjs)
113 # Link an executable based on list of .o files, a mixture of .c and .cc
114 # host-cxxmulti -> executable
115 quiet_cmd_host-cxxmulti = HOSTLD $@
116 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
117 $(foreach o,objs cxxobjs,\
118 $(addprefix $(obj)/,$($(@F)-$(o)))) \
119 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
120 $(host-cxxmulti): FORCE
121 $(call if_changed,host-cxxmulti)
122 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
124 # Create .o file from a single .cc (C++) file
125 quiet_cmd_host-cxxobjs = HOSTCXX $@
126 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
127 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
128 $(call if_changed_dep,host-cxxobjs)
130 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
131 $(host-cxxmulti) $(host-cxxobjs)