From 42640b134bf44e3bac34808e8c39660c7ae42855 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Wed, 29 Jul 2020 12:15:36 +0900 Subject: kbuild: move host .so build rules to scripts/gcc-plugins/Makefile 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 Acked-by: Kees Cook --- scripts/Makefile.host | 30 ++---------------------------- 1 file changed, 2 insertions(+), 28 deletions(-) (limited to 'scripts/Makefile.host') diff --git a/scripts/Makefile.host b/scripts/Makefile.host index c8a4a033dc3e..687ca3f309e9 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -39,7 +39,6 @@ $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE # They are linked as C++ code to the executable qconf __hostprogs := $(sort $(hostprogs)) -host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m)) # C code # Executables compiled from a single .c file @@ -61,16 +60,11 @@ host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) # C++ Object (.o) files compiled from .cc files host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) -# Object (.o) files used by the shared libaries -host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs)))) - host-csingle := $(addprefix $(obj)/,$(host-csingle)) host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) -host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib)) -host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs)) ##### # Handle options to gcc. Support building with separate output directory @@ -136,25 +130,5 @@ quiet_cmd_host-cxxobjs = HOSTCXX $@ $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE $(call if_changed_dep,host-cxxobjs) -# Compile .c file, create position independent .o file -# Note that plugin capable gcc versions can be either C or C++ based -# therefore plugin source files have to be compilable in both C and C++ mode. -# This is why a C++ compiler is invoked on a .c file. -# host-cxxshobjs -> .o -quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@ - cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $< -$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE - $(call if_changed_dep,host-cxxshobjs) - -# Link a shared library, based on position independent .o files -# *.o -> .so shared library (host-cxxshlib) -quiet_cmd_host-cxxshlib = HOSTLLD -shared $@ - cmd_host-cxxshlib = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \ - $(addprefix $(obj)/, $($(target-stem)-objs)) \ - $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem).so) -$(host-cxxshlib): FORCE - $(call if_changed,host-cxxshlib) -$(call multi_depend, $(host-cxxshlib), .so, -objs) - -targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ - $(host-cxxmulti) $(host-cxxobjs) $(host-cxxshlib) $(host-cxxshobjs) +targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \ + $(host-cxxmulti) $(host-cxxobjs) -- cgit v1.2.3 From 85569d19d0f57df5e6cbb918dbddd4f82c0117b5 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Wed, 29 Jul 2020 12:15:37 +0900 Subject: kbuild: sort hostprogs before passing it to ifneq The conditional: ifneq ($(hostprogs),) ... is evaluated to true if $(hostprogs) does not contain any word but whitespace characters. ifneq ($(strip $(hostprogs)),) ... is a safe way to avoid interpreting whitespace as a non-empty value, but I'd rather want to use the side-effect of $(sort ...) to do the equivalent. $(sort ...) is used in scripts/Makefile.host in order to drop duplication in $(hostprogs). It is also useful to strip excessive spaces. Move $(sort ...) before evaluating the ifneq. Signed-off-by: Masahiro Yamada --- scripts/Makefile.build | 5 ++++- scripts/Makefile.host | 10 ++++------ 2 files changed, 8 insertions(+), 7 deletions(-) (limited to 'scripts/Makefile.host') diff --git a/scripts/Makefile.build b/scripts/Makefile.build index d54adf0dcf39..a467b9323442 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -45,12 +45,15 @@ include $(kbuild-file) include scripts/Makefile.lib -# Do not include hostprogs rules unless needed +# Do not include hostprogs rules unless needed. +# $(sort ...) is used here to remove duplicated words and excessive spaces. +hostprogs := $(sort $(hostprogs)) ifneq ($(hostprogs),) include scripts/Makefile.host endif # Do not include userprogs rules unless needed. +# $(sort ...) is used here to remove duplicated words and excessive spaces. userprogs := $(sort $(userprogs)) ifneq ($(userprogs),) include scripts/Makefile.userprogs diff --git a/scripts/Makefile.host b/scripts/Makefile.host index 687ca3f309e9..278b4d6ac945 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -38,24 +38,22 @@ $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE # Will compile qconf as a C++ program, and menu as a C program. # They are linked as C++ code to the executable qconf -__hostprogs := $(sort $(hostprogs)) - # C code # Executables compiled from a single .c file -host-csingle := $(foreach m,$(__hostprogs), \ +host-csingle := $(foreach m,$(hostprogs), \ $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) # C executables linked based on several .o files -host-cmulti := $(foreach m,$(__hostprogs),\ +host-cmulti := $(foreach m,$(hostprogs),\ $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) # Object (.o) files compiled from .c files -host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) +host-cobjs := $(sort $(foreach m,$(hostprogs),$($(m)-objs))) # C++ code # C++ executables compiled from at least one .cc file # and zero or more .c files -host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) +host-cxxmulti := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m))) # C++ Object (.o) files compiled from .cc files host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) -- cgit v1.2.3