xref: /openbmc/linux/scripts/Makefile.host (revision 4e95bc26) 
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   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
66                 $(HOSTCFLAGS_$(basetarget).o)
67_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
68                 $(HOSTCXXFLAGS_$(basetarget).o)
69
70# $(objtree)/$(obj) for including generated headers from checkin source files
71ifeq ($(KBUILD_EXTMOD),)
72ifneq ($(srctree),.)
73_hostc_flags   += -I $(objtree)/$(obj)
74_hostcxx_flags += -I $(objtree)/$(obj)
75endif
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) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
88		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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) $(KBUILD_HOSTLDFLAGS) -o $@ \
96			  $(addprefix $(obj)/,$($(@F)-objs)) \
97			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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) $(KBUILD_HOSTLDFLAGS) -o $@ \
113			  $(foreach o,objs cxxobjs,\
114			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
115			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
147			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \
148			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
157			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \
158			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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)
165