Re: [PATCH] kbuild: move modkern_{c,a}flags to Makefile.lib from Makefile.build

From: Masahiro Yamada
Date: Wed Aug 28 2019 - 12:45:18 EST


On Mon, Aug 19, 2019 at 5:59 PM Masahiro Yamada
<yamada.masahiro@xxxxxxxxxxxxx> wrote:
>
> Makefile.lib is included by Makefile.modfinal as well as Makefile.build.
>
> Move modkern_cflags to Makefile.lib in order to simplify cmd_cc_o_c
> in Makefile.modfinal. Move modkern_cflags as well for consistency.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> ---

Applied to linux-kbuild.

>
> scripts/Makefile.build | 13 -------------
> scripts/Makefile.lib | 12 ++++++++++++
> scripts/Makefile.modfinal | 6 +++---
> 3 files changed, 15 insertions(+), 16 deletions(-)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 10adf3b558de..b46e608f9931 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -92,15 +92,6 @@ endif
> # Compile C sources (.c)
> # ---------------------------------------------------------------------------
>
> -# Default is built-in, unless we know otherwise
> -part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
> -
> -modkern_cflags = \
> - $(if $(part-of-module), \
> - $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
> - $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
> -quiet_modtag = $(if $(part-of-module),[M], )
> -
> quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
> cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
>
> @@ -304,10 +295,6 @@ $(obj)/%.h.s: $(src)/%.h FORCE
> # Compile assembler sources (.S)
> # ---------------------------------------------------------------------------
>
> -modkern_aflags = $(if $(part-of-module), \
> - $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
> - $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
> -
> # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
> # or a file that it includes, in order to get versioned symbols. We build a
> # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 264611972c4a..888e5c830646 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -159,6 +159,18 @@ _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
> endif
> endif
>
> +part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
> +quiet_modtag = $(if $(part-of-module),[M], )
> +
> +modkern_cflags = \
> + $(if $(part-of-module), \
> + $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
> + $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
> +
> +modkern_aflags = $(if $(part-of-module), \
> + $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
> + $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
> +
> c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
> -include $(srctree)/include/linux/compiler_types.h \
> $(_c_flags) $(modkern_cflags) \
> diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
> index 2e49d536a9b3..059dbcf5ae77 100644
> --- a/scripts/Makefile.modfinal
> +++ b/scripts/Makefile.modfinal
> @@ -17,12 +17,12 @@ modules := $(sort $(shell cat $(MODORDER)))
> __modfinal: $(modules)
> @:
>
> -# modname is set to make c_flags define KBUILD_MODNAME
> +# modname and part-of-module are set to make c_flags define proper module flags
> modname = $(notdir $(@:.mod.o=))
> +part-of-module = y
>
> quiet_cmd_cc_o_c = CC [M] $@
> - cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
> - -c -o $@ $<
> + cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
>
> %.mod.o: %.mod.c FORCE
> $(call if_changed_dep,cc_o_c)
> --
> 2.17.1
>


--
Best Regards
Masahiro Yamada