9870a93d31
When Makefile.host is included, $(obj-dirs) is subjected to the addprefix operation for the second time. Prefix only needs to be added to the newly added directories, but not to those that came from Makefile.lib. This causes the build system to create unneeded empty directories in the build tree when building in a separate directory. For instance, lib/lib/zlib_inflate is created in the build tree. Signed-off-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
158 lines
5.8 KiB
Makefile
158 lines
5.8 KiB
Makefile
# ==========================================================================
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# Building binaries on the host system
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# Binaries are used during the compilation of the kernel, for example
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# to preprocess a data file.
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#
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# Both C and C++ is supported, but preferred language is C for such utilities.
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#
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# Samle syntax (see Documentation/kbuild/makefile.txt for reference)
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# hostprogs-y := bin2hex
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# Will compile bin2hex.c and create an executable named bin2hex
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#
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# hostprogs-y := lxdialog
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# lxdialog-objs := checklist.o lxdialog.o
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# Will compile lxdialog.c and checklist.c, and then link the executable
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# lxdialog, based on checklist.o and lxdialog.o
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#
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# hostprogs-y := qconf
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# qconf-cxxobjs := qconf.o
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# qconf-objs := menu.o
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# Will compile qconf as a C++ program, and menu as a C program.
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# They are linked as C++ code to the executable qconf
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# hostprogs-y := conf
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# conf-objs := conf.o libkconfig.so
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# libkconfig-objs := expr.o type.o
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# Will create a shared library named libkconfig.so that consist of
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# expr.o and type.o (they are both compiled as C code and the object file
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# are made as position independent code).
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# conf.c is compiled as a c program, and conf.o is linked together with
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# libkconfig.so as the executable conf.
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# Note: Shared libraries consisting of C++ files are not supported
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__hostprogs := $(sort $(hostprogs-y)$(hostprogs-m))
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# hostprogs-y := tools/build may have been specified. Retreive directory
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host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
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host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
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# C code
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# Executables compiled from a single .c file
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host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
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# C executables linked based on several .o files
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host-cmulti := $(foreach m,$(__hostprogs),\
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$(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
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# Object (.o) files compiled from .c files
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host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
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# C++ code
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# C++ executables compiled from at least on .cc file
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# and zero or more .c files
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host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
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# C++ Object (.o) files compiled from .cc files
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host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
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# Shared libaries (only .c supported)
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# Shared libraries (.so) - all .so files referenced in "xxx-objs"
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host-cshlib := $(sort $(filter %.so, $(host-cobjs)))
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# Remove .so files from "xxx-objs"
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host-cobjs := $(filter-out %.so,$(host-cobjs))
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#Object (.o) files used by the shared libaries
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host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
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__hostprogs := $(addprefix $(obj)/,$(__hostprogs))
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host-csingle := $(addprefix $(obj)/,$(host-csingle))
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host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
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host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
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host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
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host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
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host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
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host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
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host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
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obj-dirs += $(host-objdirs)
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#####
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# Handle options to gcc. Support building with separate output directory
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_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS_$(*F).o)
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_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) $(HOSTCXXFLAGS_$(*F).o)
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ifeq ($(KBUILD_SRC),)
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__hostc_flags = $(_hostc_flags)
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__hostcxx_flags = $(_hostcxx_flags)
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else
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__hostc_flags = -I$(obj) $(call flags,_hostc_flags)
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__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
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endif
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hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)
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hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)
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#####
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# Compile programs on the host
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# Create executable from a single .c file
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# host-csingle -> Executable
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quiet_cmd_host-csingle = HOSTCC $@
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cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \
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$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
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$(host-csingle): %: %.c FORCE
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$(call if_changed_dep,host-csingle)
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# Link an executable based on list of .o files, all plain c
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# host-cmulti -> executable
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quiet_cmd_host-cmulti = HOSTLD $@
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cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
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$(addprefix $(obj)/,$($(@F)-objs)) \
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$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
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$(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
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$(call if_changed,host-cmulti)
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# Create .o file from a single .c file
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# host-cobjs -> .o
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quiet_cmd_host-cobjs = HOSTCC $@
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cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
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$(host-cobjs): %.o: %.c FORCE
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$(call if_changed_dep,host-cobjs)
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# Link an executable based on list of .o files, a mixture of .c and .cc
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# host-cxxmulti -> executable
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quiet_cmd_host-cxxmulti = HOSTLD $@
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cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
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$(foreach o,objs cxxobjs,\
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$(addprefix $(obj)/,$($(@F)-$(o)))) \
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$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
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$(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
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$(call if_changed,host-cxxmulti)
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# Create .o file from a single .cc (C++) file
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quiet_cmd_host-cxxobjs = HOSTCXX $@
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cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
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$(host-cxxobjs): %.o: %.cc FORCE
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$(call if_changed_dep,host-cxxobjs)
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# Compile .c file, create position independent .o file
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# host-cshobjs -> .o
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quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
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cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
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$(host-cshobjs): %.o: %.c FORCE
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$(call if_changed_dep,host-cshobjs)
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# Link a shared library, based on position independent .o files
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# *.o -> .so shared library (host-cshlib)
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quiet_cmd_host-cshlib = HOSTLLD -shared $@
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cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
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$(addprefix $(obj)/,$($(@F:.so=-objs))) \
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$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
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$(host-cshlib): %: $(host-cshobjs) FORCE
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$(call if_changed,host-cshlib)
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targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
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$(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)
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