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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.
5#
6# Both C and C++ are supported, but preferred language is C for such utilities.
7#
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
11#
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
16#
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
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22#
23# SPDX-License-Identifier: GPL-2.0
24#
22433fc5 25
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26__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
27
28# C code
29# Executables compiled from a single .c file
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30host-csingle := $(foreach m,$(__hostprogs), \
31 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
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32
33# C executables linked based on several .o files
34host-cmulti := $(foreach m,$(__hostprogs),\
35 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
36
37# Object (.o) files compiled from .c files
38host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
39
40# C++ code
87e90729 41# C++ executables compiled from at least one .cc file
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42# and zero or more .c files
43host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
44
45# C++ Object (.o) files compiled from .cc files
46host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
47
22433fc5 48# output directory for programs/.o files
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49# hostprogs-y := tools/build may have been specified.
50# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
51host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
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52
53host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
54
55
56__hostprogs := $(addprefix $(obj)/,$(__hostprogs))
57host-csingle := $(addprefix $(obj)/,$(host-csingle))
58host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
59host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
60host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
61host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
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62host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
63
64obj-dirs += $(host-objdirs)
65
66#####
67# Handle options to gcc. Support building with separate output directory
68
69_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
70 $(HOSTCFLAGS_$(basetarget).o)
71_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
72 $(HOSTCXXFLAGS_$(basetarget).o)
73
74ifeq ($(KBUILD_SRC),)
75__hostc_flags = $(_hostc_flags)
76__hostcxx_flags = $(_hostcxx_flags)
77else
78__hostc_flags = -I$(obj) $(call flags,_hostc_flags)
79__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
80endif
81
82hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
83hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
84
85#####
86# Compile programs on the host
87
88# Create executable from a single .c file
89# host-csingle -> Executable
90quiet_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)
95
96# Link an executable based on list of .o files, all plain c
97# host-cmulti -> executable
98quiet_cmd_host-cmulti = HOSTLD $@
99 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
100 $(addprefix $(obj)/,$($(@F)-objs)) \
101 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
cb6e7b0d 102$(host-cmulti): FORCE
22433fc5 103 $(call if_changed,host-cmulti)
cb6e7b0d 104$(call multi_depend, $(host-cmulti), , -objs)
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105
106# Create .o file from a single .c file
107# host-cobjs -> .o
108quiet_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)
112
113# Link an executable based on list of .o files, a mixture of .c and .cc
114# host-cxxmulti -> executable
115quiet_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))
cb6e7b0d 120$(host-cxxmulti): FORCE
22433fc5 121 $(call if_changed,host-cxxmulti)
cb6e7b0d 122$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
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123
124# Create .o file from a single .cc (C++) file
125quiet_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)
129
22433fc5 130targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
87e90729 131 $(host-cxxmulti) $(host-cxxobjs)