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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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42640b134b
The host shared library rules are currently implemented in scripts/Makefile.host, but actually GCC-plugin is the only user of them. (The VDSO .so files are built for the target by different build rules) Hence, they do not need to be treewide available. Move all the relevant build rules to scripts/gcc-plugins/Makefile. I also optimized the build steps so *.so is directly built from .c because every upstream plugin is compiled from a single source file. I am still keeping the multi-file plugin support, which Kees Cook mentioned might be needed by out-of-tree plugins. (https://lkml.org/lkml/2019/1/11/1107) If the plugin, foo.so, is compiled from two files foo.c and foo2.c, then you can do like follows: foo-objs := foo.o foo2.o Single-file plugins do not need the *-objs notation. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Kees Cook <keescook@chromium.org>
135 lines
4.7 KiB
Makefile
135 lines
4.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# LEX
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# ---------------------------------------------------------------------------
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quiet_cmd_flex = LEX $@
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cmd_flex = $(LEX) -o$@ -L $<
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$(obj)/%.lex.c: $(src)/%.l FORCE
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$(call if_changed,flex)
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# YACC
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# ---------------------------------------------------------------------------
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quiet_cmd_bison = YACC $(basename $@).[ch]
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cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
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$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
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$(call if_changed,bison)
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# ==========================================================================
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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++ are supported, but preferred language is C for such utilities.
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#
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# Sample syntax (see Documentation/kbuild/makefiles.rst for reference)
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# hostprogs := bin2hex
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# Will compile bin2hex.c and create an executable named bin2hex
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#
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# hostprogs := 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 := 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 := $(sort $(hostprogs))
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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), \
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$(if $($(m)-objs)$($(m)-cxxobjs),,$(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 one .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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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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#####
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# Handle options to gcc. Support building with separate output directory
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_hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
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$(HOSTCFLAGS_$(target-stem).o)
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_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
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$(HOSTCXXFLAGS_$(target-stem).o)
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# $(objtree)/$(obj) for including generated headers from checkin source files
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ifeq ($(KBUILD_EXTMOD),)
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ifdef building_out_of_srctree
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_hostc_flags += -I $(objtree)/$(obj)
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_hostcxx_flags += -I $(objtree)/$(obj)
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endif
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endif
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hostc_flags = -Wp,-MMD,$(depfile) $(_hostc_flags)
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hostcxx_flags = -Wp,-MMD,$(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) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
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$(host-csingle): $(obj)/%: $(src)/%.c FORCE
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$(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) $(KBUILD_HOSTLDFLAGS) -o $@ \
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$(addprefix $(obj)/, $($(target-stem)-objs)) \
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
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$(host-cmulti): FORCE
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$(call if_changed,host-cmulti)
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$(call multi_depend, $(host-cmulti), , -objs)
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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): $(obj)/%.o: $(src)/%.c FORCE
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$(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) $(KBUILD_HOSTLDFLAGS) -o $@ \
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$(foreach o,objs cxxobjs,\
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$(addprefix $(obj)/, $($(target-stem)-$(o)))) \
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
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$(host-cxxmulti): FORCE
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$(call if_changed,host-cxxmulti)
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$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
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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): $(obj)/%.o: $(src)/%.cc FORCE
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$(call if_changed_dep,host-cxxobjs)
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targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \
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$(host-cxxmulti) $(host-cxxobjs)
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