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
83hostc_flags    = -Wp,-MMD,$(depfile) \
84                 $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
85                 $(HOSTCFLAGS_$(target-stem).o)
86hostcxx_flags  = -Wp,-MMD,$(depfile) \
87                 $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
88                 $(HOSTCXXFLAGS_$(target-stem).o)
89
90# `--out-dir` is required to avoid temporaries being created by `rustc` in the
91# current working directory, which may be not accessible in the out-of-tree
92# modules case.
93hostrust_flags = --out-dir $(dir $@) --emit=dep-info=$(depfile) \
94		 -Clinker-flavor=gcc -Clinker=$(HOSTCC) \
95		 -Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \
96                 $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
97                 $(HOSTRUSTFLAGS_$(target-stem))
98
99# $(objtree)/$(obj) for including generated headers from checkin source files
100ifeq ($(KBUILD_EXTMOD),)
101ifdef building_out_of_srctree
102hostc_flags   += -I $(objtree)/$(obj)
103hostcxx_flags += -I $(objtree)/$(obj)
104endif
105endif
106
107#####
108# Compile programs on the host
109
110# Create executable from a single .c file
111# host-csingle -> Executable
112quiet_cmd_host-csingle 	= HOSTCC  $@
113      cmd_host-csingle	= $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
114		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
115$(host-csingle): $(obj)/%: $(obj)/%.c FORCE
116	$(call if_changed_dep,host-csingle)
117
118# Link an executable based on list of .o files, all plain c
119# host-cmulti -> executable
120quiet_cmd_host-cmulti	= HOSTLD  $@
121      cmd_host-cmulti	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
122			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
123			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
124$(host-cmulti): FORCE
125	$(call if_changed,host-cmulti)
126$(call multi_depend, $(host-cmulti), , -objs)
127
128# Create .o file from a single .c file
129# host-cobjs -> .o
130quiet_cmd_host-cobjs	= HOSTCC  $@
131      cmd_host-cobjs	= $(HOSTCC) $(hostc_flags) -c -o $@ $<
132$(host-cobjs): $(obj)/%.o: $(obj)/%.c FORCE
133	$(call if_changed_dep,host-cobjs)
134
135# Link an executable based on list of .o files, a mixture of .c and .cc
136# host-cxxmulti -> executable
137quiet_cmd_host-cxxmulti	= HOSTLD  $@
138      cmd_host-cxxmulti	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
139			  $(foreach o,objs cxxobjs,\
140			  $(addprefix $(obj)/, $($(target-stem)-$(o)))) \
141			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
142$(host-cxxmulti): FORCE
143	$(call if_changed,host-cxxmulti)
144$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
145
146# Create .o file from a single .cc (C++) file
147quiet_cmd_host-cxxobjs	= HOSTCXX $@
148      cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
149$(host-cxxobjs): $(obj)/%.o: $(obj)/%.cc FORCE
150	$(call if_changed_dep,host-cxxobjs)
151
152# Create executable from a single Rust crate (which may consist of
153# one or more `.rs` files)
154# host-rust -> Executable
155quiet_cmd_host-rust	= HOSTRUSTC $@
156      cmd_host-rust	= \
157	$(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<
158$(host-rust): $(obj)/%: $(src)/%.rs FORCE
159	+$(call if_changed_dep,host-rust)
160
161targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \
162	   $(host-cxxmulti) $(host-cxxobjs) $(host-rust)
163
164# %.lex.o <- %.lex.c <- %.l
165# %.tab.o <- %.tab.[ch] <- %.y
166targets += $(call intermediate_targets, .lex.o, .lex.c) \
167           $(call intermediate_targets, .tab.o, .tab.c .tab.h)
168