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))
25
26# C code
27# Executables compiled from a single .c file
28host-csingle	:= $(foreach m,$(__hostprogs), \
29			$(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-sharedobjs),,$(m)))
30
31# C executables linked based on several .o files
32host-cmulti	:= $(foreach m,$(__hostprogs),\
33		   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
34
35# Shared object libraries
36host-shared	:= $(foreach m,$(__hostprogs),\
37		   $(if $($(m)-sharedobjs),$(m))))
38
39# Object (.o) files compiled from .c files
40host-cobjs	:= $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
41
42# C++ code
43# C++ executables compiled from at least one .cc file
44# and zero or more .c files
45host-cxxmulti	:= $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
46
47# C++ Object (.o) files compiled from .cc files
48host-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
49
50# output directory for programs/.o files
51# hostprogs-y := tools/build may have been specified.
52# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
53host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
54
55host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
56
57
58__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
59host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
60host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
61host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))
62host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
63host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))
64host-shared	:= $(addprefix $(obj)/,$(host-shared))
65host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
66
67obj-dirs += $(host-objdirs)
68
69#####
70# Handle options to gcc. Support building with separate output directory
71
72_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
73                 $(HOSTCFLAGS_$(basetarget).o)
74_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
75                 $(HOSTCXXFLAGS_$(basetarget).o)
76
77ifeq ($(KBUILD_SRC),)
78__hostc_flags	= $(_hostc_flags)
79__hostcxx_flags	= $(_hostcxx_flags)
80else
81__hostc_flags	= -I$(obj) $(call flags,_hostc_flags)
82__hostcxx_flags	= -I$(obj) $(call flags,_hostcxx_flags)
83endif
84
85hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
86hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
87
88#####
89# Compile programs on the host
90
91# Create executable from a single .c file
92# host-csingle -> Executable
93quiet_cmd_host-csingle 	= HOSTCC  $@
94      cmd_host-csingle	= $(HOSTCC) $(hostc_flags) -o $@ $< \
95	  	$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
96$(host-csingle): $(obj)/%: $(src)/%.c FORCE
97	$(call if_changed_dep,host-csingle)
98
99# Link an executable based on list of .o files, all plain c
100# host-cmulti -> executable
101quiet_cmd_host-cmulti	= HOSTLD  $@
102      cmd_host-cmulti	= $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
103			  $(addprefix $(obj)/,$($(@F)-objs)) \
104			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
105$(host-cmulti): FORCE
106	$(call if_changed,host-cmulti)
107$(call multi_depend, $(host-cmulti), , -objs)
108
109# Create .o file from a single .c file
110# host-cobjs -> .o
111quiet_cmd_host-cobjs	= HOSTCC  $@
112      cmd_host-cobjs	= $(HOSTCC) $(hostc_flags) -c -o $@ $<
113$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
114	$(call if_changed_dep,host-cobjs)
115
116# Link an executable based on list of .o files, a mixture of .c and .cc
117# host-cxxmulti -> executable
118quiet_cmd_host-cxxmulti	= HOSTLD  $@
119      cmd_host-cxxmulti	= $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
120			  $(foreach o,objs cxxobjs,\
121			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
122			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
123$(host-cxxmulti): FORCE
124	$(call if_changed,host-cxxmulti)
125$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
126
127# Create .o file from a single .cc (C++) file
128quiet_cmd_host-cxxobjs	= HOSTCXX $@
129      cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
130$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
131	$(call if_changed_dep,host-cxxobjs)
132
133targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
134	   $(host-cxxmulti) $(host-cxxobjs) $(host-shared)
135