tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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++ is supported, but preferred language is C for such utilities.
7#
8# Samle syntax (see Documentation/kbuild/makefile.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-y := conf
24# conf-objs := conf.o libkconfig.so
25# libkconfig-objs := expr.o type.o
26# Will create a shared library named libkconfig.so that consist of
27# expr.o and type.o (they are both compiled as C code and the object file
28# are made as position independent code).
29# conf.c is compiled as a c program, and conf.o is linked together with
30# libkconfig.so as the executable conf.
31# Note: Shared libraries consisting of C++ files are not supported
32
33__hostprogs := $(sort $(hostprogs-y)$(hostprogs-m))
34
35# hostprogs-y := tools/build may have been specified. Retreive directory
36host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
37host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
38
39
40# C code
41# Executables compiled from a single .c file
42host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
43
44# C executables linked based on several .o files
45host-cmulti := $(foreach m,$(__hostprogs),\
46 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
47
48# Object (.o) files compiled from .c files
49host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
50
51# C++ code
52# C++ executables compiled from at least on .cc file
53# and zero or more .c files
54host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
55
56# C++ Object (.o) files compiled from .cc files
57host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
58
59# Shared libaries (only .c supported)
60# Shared libraries (.so) - all .so files referenced in "xxx-objs"
61host-cshlib := $(sort $(filter %.so, $(host-cobjs)))
62# Remove .so files from "xxx-objs"
63host-cobjs := $(filter-out %.so,$(host-cobjs))
64
65#Object (.o) files used by the shared libaries
66host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
67
68__hostprogs := $(addprefix $(obj)/,$(__hostprogs))
69host-csingle := $(addprefix $(obj)/,$(host-csingle))
70host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
71host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
72host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
73host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
74host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
75host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
76host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
77
78obj-dirs += $(host-objdirs)
79
80#####
81# Handle options to gcc. Support building with separate output directory
82
83_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS_$(*F).o)
84_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) $(HOSTCXXFLAGS_$(*F).o)
85
86ifeq ($(KBUILD_SRC),)
87__hostc_flags = $(_hostc_flags)
88__hostcxx_flags = $(_hostcxx_flags)
89else
90__hostc_flags = -I$(obj) $(call flags,_hostc_flags)
91__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
92endif
93
94hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
95hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
96
97#####
98# Compile programs on the host
99
100# Create executable from a single .c file
101# host-csingle -> Executable
102quiet_cmd_host-csingle = HOSTCC $@
103 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
104 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
105$(host-csingle): %: %.c FORCE
106 $(call if_changed_dep,host-csingle)
107
108# Link an executable based on list of .o files, all plain c
109# host-cmulti -> executable
110quiet_cmd_host-cmulti = HOSTLD $@
111 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
112 $(addprefix $(obj)/,$($(@F)-objs)) \
113 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
114$(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
115 $(call if_changed,host-cmulti)
116
117# Create .o file from a single .c file
118# host-cobjs -> .o
119quiet_cmd_host-cobjs = HOSTCC $@
120 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
121$(host-cobjs): %.o: %.c FORCE
122 $(call if_changed_dep,host-cobjs)
123
124# Link an executable based on list of .o files, a mixture of .c and .cc
125# host-cxxmulti -> executable
126quiet_cmd_host-cxxmulti = HOSTLD $@
127 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
128 $(foreach o,objs cxxobjs,\
129 $(addprefix $(obj)/,$($(@F)-$(o)))) \
130 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
131$(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
132 $(call if_changed,host-cxxmulti)
133
134# Create .o file from a single .cc (C++) file
135quiet_cmd_host-cxxobjs = HOSTCXX $@
136 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
137$(host-cxxobjs): %.o: %.cc FORCE
138 $(call if_changed_dep,host-cxxobjs)
139
140# Compile .c file, create position independent .o file
141# host-cshobjs -> .o
142quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
143 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
144$(host-cshobjs): %.o: %.c FORCE
145 $(call if_changed_dep,host-cshobjs)
146
147# Link a shared library, based on position independent .o files
148# *.o -> .so shared library (host-cshlib)
149quiet_cmd_host-cshlib = HOSTLLD -shared $@
150 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
151 $(addprefix $(obj)/,$($(@F:.so=-objs))) \
152 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
153$(host-cshlib): %: $(host-cshobjs) FORCE
154 $(call if_changed,host-cshlib)
155
156targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
157 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)
158