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
22
23__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
24
25# C code
26# Executables compiled from a single .c file
27host-csingle	:= $(foreach m,$(__hostprogs), \
28			$(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
29
30# C executables linked based on several .o files
31host-cmulti	:= $(foreach m,$(__hostprogs),\
32		   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
33
34# Object (.o) files compiled from .c files
35host-cobjs	:= $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
36
37# C++ code
38# C++ executables compiled from at least one .cc file
39# and zero or more .c files
40host-cxxmulti	:= $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
41
42# C++ Object (.o) files compiled from .cc files
43host-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
44
45# output directory for programs/.o files
46# hostprogs-y := tools/build may have been specified.
47# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
48host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
49
50host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
51
52
53__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
54host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
55host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
56host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))
57host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
58host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))
59host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
60
61obj-dirs += $(host-objdirs)
62
63#####
64# Handle options to gcc. Support building with separate output directory
65
66_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
67                 $(HOSTCFLAGS_$(basetarget).o)
68_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
69                 $(HOSTCXXFLAGS_$(basetarget).o)
70
71ifeq ($(KBUILD_SRC),)
72__hostc_flags	= $(_hostc_flags)
73__hostcxx_flags	= $(_hostcxx_flags)
74else
75__hostc_flags	= -I$(obj) $(call flags,_hostc_flags)
76__hostcxx_flags	= -I$(obj) $(call flags,_hostcxx_flags)
77endif
78
79hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
80hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
81
82#####
83# Compile programs on the host
84
85# Create executable from a single .c file
86# host-csingle -> Executable
87quiet_cmd_host-csingle 	= HOSTCC  $@
88      cmd_host-csingle	= $(HOSTCC) $(hostc_flags) -o $@ $< \
89	  	$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
90$(host-csingle): $(obj)/%: $(src)/%.c FORCE
91	$(call if_changed_dep,host-csingle)
92
93# Link an executable based on list of .o files, all plain c
94# host-cmulti -> executable
95quiet_cmd_host-cmulti	= HOSTLD  $@
96      cmd_host-cmulti	= $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
97			  $(addprefix $(obj)/,$($(@F)-objs)) \
98			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
99$(host-cmulti): FORCE
100	$(call if_changed,host-cmulti)
101$(call multi_depend, $(host-cmulti), , -objs)
102
103# Create .o file from a single .c file
104# host-cobjs -> .o
105quiet_cmd_host-cobjs	= HOSTCC  $@
106      cmd_host-cobjs	= $(HOSTCC) $(hostc_flags) -c -o $@ $<
107$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
108	$(call if_changed_dep,host-cobjs)
109
110# Link an executable based on list of .o files, a mixture of .c and .cc
111# host-cxxmulti -> executable
112quiet_cmd_host-cxxmulti	= HOSTLD  $@
113      cmd_host-cxxmulti	= $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
114			  $(foreach o,objs cxxobjs,\
115			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
116			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
117$(host-cxxmulti): FORCE
118	$(call if_changed,host-cxxmulti)
119$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
120
121# Create .o file from a single .cc (C++) file
122quiet_cmd_host-cxxobjs	= HOSTCXX $@
123      cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
124$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
125	$(call if_changed_dep,host-cxxobjs)
126
127targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
128	   $(host-cxxmulti) $(host-cxxobjs)
129