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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002# ==========================================================================
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.
6#
Robert P. J. Day3156fd02008-02-18 04:48:20 -05007# Both C and C++ are supported, but preferred language is C for such utilities.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#
Robert P. J. Day3156fd02008-02-18 04:48:20 -05009# Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
Linus Torvalds1da177e2005-04-16 15:20:36 -070010# hostprogs-y := bin2hex
11# Will compile bin2hex.c and create an executable named bin2hex
12#
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
17#
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
23
Ross Biro8f5cbd72006-09-16 12:15:39 -070024__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
Emese Revfy24403872016-05-24 00:08:25 +020025host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
26host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Linus Torvalds1da177e2005-04-16 15:20:36 -070028# C code
29# Executables compiled from a single .c file
Masahiro Yamadaedb950c2014-07-16 16:12:20 +090030host-csingle := $(foreach m,$(__hostprogs), \
31 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
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
Masahiro Yamadad8d9efe2014-07-16 16:12:19 +090041# C++ executables compiled from at least one .cc file
Linus Torvalds1da177e2005-04-16 15:20:36 -070042# 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
Emese Revfy24403872016-05-24 00:08:25 +020048# Object (.o) files used by the shared libaries
49host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
50host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052host-csingle := $(addprefix $(obj)/,$(host-csingle))
53host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
54host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
55host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
56host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
Emese Revfy24403872016-05-24 00:08:25 +020057host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
58host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
59host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
60host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62#####
63# Handle options to gcc. Support building with separate output directory
64
Sam Ravnborg5e8d7802006-07-01 09:58:02 +020065_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
66 $(HOSTCFLAGS_$(basetarget).o)
67_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
68 $(HOSTCXXFLAGS_$(basetarget).o)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70ifeq ($(KBUILD_SRC),)
71__hostc_flags = $(_hostc_flags)
72__hostcxx_flags = $(_hostcxx_flags)
73else
74__hostc_flags = -I$(obj) $(call flags,_hostc_flags)
75__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
76endif
77
78hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
79hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
80
81#####
82# Compile programs on the host
83
84# Create executable from a single .c file
85# host-csingle -> Executable
86quiet_cmd_host-csingle = HOSTCC $@
Matthias Urlichse0af0d82005-02-18 10:23:41 +010087 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
88 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
Sam Ravnborg767e5812007-05-06 09:23:45 +020089$(host-csingle): $(obj)/%: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 $(call if_changed_dep,host-csingle)
91
92# Link an executable based on list of .o files, all plain c
93# host-cmulti -> executable
94quiet_cmd_host-cmulti = HOSTLD $@
95 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
96 $(addprefix $(obj)/,$($(@F)-objs)) \
97 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
Masahiro Yamada97e32262014-08-19 16:34:21 +090098$(host-cmulti): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 $(call if_changed,host-cmulti)
Masahiro Yamada97e32262014-08-19 16:34:21 +0900100$(call multi_depend, $(host-cmulti), , -objs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102# Create .o file from a single .c file
103# host-cobjs -> .o
104quiet_cmd_host-cobjs = HOSTCC $@
105 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
Sam Ravnborg767e5812007-05-06 09:23:45 +0200106$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 $(call if_changed_dep,host-cobjs)
108
109# Link an executable based on list of .o files, a mixture of .c and .cc
110# host-cxxmulti -> executable
111quiet_cmd_host-cxxmulti = HOSTLD $@
112 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
113 $(foreach o,objs cxxobjs,\
114 $(addprefix $(obj)/,$($(@F)-$(o)))) \
115 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
Masahiro Yamada97e32262014-08-19 16:34:21 +0900116$(host-cxxmulti): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 $(call if_changed,host-cxxmulti)
Masahiro Yamada97e32262014-08-19 16:34:21 +0900118$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120# Create .o file from a single .cc (C++) file
121quiet_cmd_host-cxxobjs = HOSTCXX $@
122 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
Sam Ravnborg767e5812007-05-06 09:23:45 +0200123$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 $(call if_changed_dep,host-cxxobjs)
125
Emese Revfy24403872016-05-24 00:08:25 +0200126# Compile .c file, create position independent .o file
127# host-cshobjs -> .o
128quiet_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)
132
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
138quiet_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)
142
143# Link a shared library, based on position independent .o files
144# *.o -> .so shared library (host-cshlib)
145quiet_cmd_host-cshlib = HOSTLLD -shared $@
146 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
147 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
148 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
149$(host-cshlib): FORCE
150 $(call if_changed,host-cshlib)
151$(call multi_depend, $(host-cshlib), .so, -objs)
152
153# Link a shared library, based on position independent .o files
154# *.o -> .so shared library (host-cxxshlib)
155quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
156 cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
157 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
158 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
159$(host-cxxshlib): FORCE
160 $(call if_changed,host-cxxshlib)
161$(call multi_depend, $(host-cxxshlib), .so, -objs)
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
Emese Revfy24403872016-05-24 00:08:25 +0200164 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)