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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.
6#
7# Both C and C++ are supported, but preferred language is C for such utilities.
8#
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
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
24__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
25host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
26host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
27
28# C code
29# Executables compiled from a single .c file
30host-csingle := $(foreach m,$(__hostprogs), \
31 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
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
41# C++ executables compiled from at least one .cc file
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
48# 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
52host-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))
57host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
58host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
59host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
60host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
61
62#####
63# Handle options to gcc. Support building with separate output directory
64
65_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
66 $(HOSTCFLAGS_$(basetarget).o)
67_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
68 $(HOSTCXXFLAGS_$(basetarget).o)
69
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 $@
87 cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(HOSTLDFLAGS) -o $@ $< \
88 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
89$(host-csingle): $(obj)/%: $(src)/%.c FORCE
90 $(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))
98$(host-cmulti): FORCE
99 $(call if_changed,host-cmulti)
100$(call multi_depend, $(host-cmulti), , -objs)
101
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 $@ $<
106$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
107 $(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))
116$(host-cxxmulti): FORCE
117 $(call if_changed,host-cxxmulti)
118$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
119
120# Create .o file from a single .cc (C++) file
121quiet_cmd_host-cxxobjs = HOSTCXX $@
122 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
123$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
124 $(call if_changed_dep,host-cxxobjs)
125
126# 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
163targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
164 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
1# SPDX-License-Identifier: GPL-2.0
2
3# LEX
4# ---------------------------------------------------------------------------
5quiet_cmd_flex = LEX $@
6 cmd_flex = $(LEX) -o$@ -L $<
7
8$(obj)/%.lex.c: $(src)/%.l FORCE
9 $(call if_changed,flex)
10
11# YACC
12# ---------------------------------------------------------------------------
13quiet_cmd_bison = YACC $(basename $@).[ch]
14 cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
15
16$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
17 $(call if_changed,bison)
18
19# ==========================================================================
20# Building binaries on the host system
21# Binaries are used during the compilation of the kernel, for example
22# to preprocess a data file.
23#
24# Both C and C++ are supported, but preferred language is C for such utilities.
25# Rust is also supported, but it may only be used in scenarios where a Rust
26# toolchain is required to be available (e.g. when `CONFIG_RUST` is enabled).
27#
28# Sample syntax (see Documentation/kbuild/makefiles.rst for reference)
29# hostprogs := bin2hex
30# Will compile bin2hex.c and create an executable named bin2hex
31#
32# hostprogs := lxdialog
33# lxdialog-objs := checklist.o lxdialog.o
34# Will compile lxdialog.c and checklist.c, and then link the executable
35# lxdialog, based on checklist.o and lxdialog.o
36#
37# hostprogs := qconf
38# qconf-cxxobjs := qconf.o
39# qconf-objs := menu.o
40# Will compile qconf as a C++ program, and menu as a C program.
41# They are linked as C++ code to the executable qconf
42#
43# hostprogs := target
44# target-rust := y
45# Will compile `target` as a Rust program, using `target.rs` as the crate root.
46# The crate may consist of several source files.
47
48# C code
49# Executables compiled from a single .c file
50host-csingle := $(foreach m,$(hostprogs), \
51 $(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-rust),,$(m)))
52
53# C executables linked based on several .o files
54host-cmulti := $(foreach m,$(hostprogs),\
55 $(if $($(m)-cxxobjs)$($(m)-rust),,$(if $($(m)-objs),$(m))))
56
57# Object (.o) files compiled from .c files
58host-cobjs := $(sort $(foreach m,$(hostprogs),$($(m)-objs)))
59
60# C++ code
61# C++ executables compiled from at least one .cc file
62# and zero or more .c files
63host-cxxmulti := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m)))
64
65# C++ Object (.o) files compiled from .cc files
66host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
67
68# Rust code
69# Executables compiled from a single Rust crate (which may consist of
70# one or more .rs files)
71host-rust := $(foreach m,$(hostprogs),$(if $($(m)-rust),$(m)))
72
73host-csingle := $(addprefix $(obj)/,$(host-csingle))
74host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
75host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
76host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
77host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
78host-rust := $(addprefix $(obj)/,$(host-rust))
79
80#####
81# Handle options to gcc. Support building with separate output directory
82
83_hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
84 $(HOSTCFLAGS_$(target-stem).o)
85_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
86 $(HOSTCXXFLAGS_$(target-stem).o)
87_hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
88 $(HOSTRUSTFLAGS_$(target-stem))
89
90# $(objtree)/$(obj) for including generated headers from checkin source files
91ifeq ($(KBUILD_EXTMOD),)
92ifdef building_out_of_srctree
93_hostc_flags += -I $(objtree)/$(obj)
94_hostcxx_flags += -I $(objtree)/$(obj)
95endif
96endif
97
98hostc_flags = -Wp,-MMD,$(depfile) $(_hostc_flags)
99hostcxx_flags = -Wp,-MMD,$(depfile) $(_hostcxx_flags)
100hostrust_flags = $(_hostrust_flags)
101
102#####
103# Compile programs on the host
104
105# Create executable from a single .c file
106# host-csingle -> Executable
107quiet_cmd_host-csingle = HOSTCC $@
108 cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
109 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
110$(host-csingle): $(obj)/%: $(src)/%.c FORCE
111 $(call if_changed_dep,host-csingle)
112
113# Link an executable based on list of .o files, all plain c
114# host-cmulti -> executable
115quiet_cmd_host-cmulti = HOSTLD $@
116 cmd_host-cmulti = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
117 $(addprefix $(obj)/, $($(target-stem)-objs)) \
118 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
119$(host-cmulti): FORCE
120 $(call if_changed,host-cmulti)
121$(call multi_depend, $(host-cmulti), , -objs)
122
123# Create .o file from a single .c file
124# host-cobjs -> .o
125quiet_cmd_host-cobjs = HOSTCC $@
126 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
127$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
128 $(call if_changed_dep,host-cobjs)
129
130# Link an executable based on list of .o files, a mixture of .c and .cc
131# host-cxxmulti -> executable
132quiet_cmd_host-cxxmulti = HOSTLD $@
133 cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
134 $(foreach o,objs cxxobjs,\
135 $(addprefix $(obj)/, $($(target-stem)-$(o)))) \
136 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
137$(host-cxxmulti): FORCE
138 $(call if_changed,host-cxxmulti)
139$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
140
141# Create .o file from a single .cc (C++) file
142quiet_cmd_host-cxxobjs = HOSTCXX $@
143 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
144$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
145 $(call if_changed_dep,host-cxxobjs)
146
147# Create executable from a single Rust crate (which may consist of
148# one or more `.rs` files)
149# host-rust -> Executable
150quiet_cmd_host-rust = HOSTRUSTC $@
151 cmd_host-rust = \
152 $(HOSTRUSTC) $(hostrust_flags) --emit=dep-info,link \
153 --out-dir=$(obj)/ $<; \
154 mv $(obj)/$(target-stem).d $(depfile); \
155 sed -i '/^\#/d' $(depfile)
156$(host-rust): $(obj)/%: $(src)/%.rs FORCE
157 $(call if_changed_dep,host-rust)
158
159targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \
160 $(host-cxxmulti) $(host-cxxobjs) $(host-rust)