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SubjectRe: [PATCH 1/2] Kbuild: lto: add make-version macros
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Hi Lecopzer,

On 6/30/2021 5:14 AM, Lecopzer Chen wrote:
> To check the GNU make version. Used by the LTO Kconfig.
>
> LTO with MODVERSION will fail in generating correct CRC because
> the makefile rule doesn't work for make with version 3.8X.[1]
>
> Thus we need to check make version during selecting on LTO Kconfig.
> The MAKE_VERSION_INT means MAKE_VERSION in canonical digits integer and
> implemnted by imitating CLANG_VERSION.

implemented

>
> [1] https://lore.kernel.org/lkml/20210616080252.32046-1-lecopzer.chen@mediatek.com/
> Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
> ---
> Makefile | 2 +-
> init/Kconfig | 4 ++++
> scripts/Kconfig.include | 3 +++
> scripts/make-version.sh | 13 +++++++++++++
> 4 files changed, 21 insertions(+), 1 deletion(-)
> create mode 100755 scripts/make-version.sh
>
> diff --git a/Makefile b/Makefile
> index 88888fff4c62..2402745b2ba9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -516,7 +516,7 @@ CLANG_FLAGS :=
>
> export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
> export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
> -export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
> +export PERL PYTHON3 CHECK CHECKFLAGS MAKE MAKE_VERSION UTS_MACHINE HOSTCXX
> export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
> export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
>
> diff --git a/init/Kconfig b/init/Kconfig
> index a61c92066c2e..9f2b71fdf23e 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -83,6 +83,10 @@ config TOOLS_SUPPORT_RELR
> config CC_HAS_ASM_INLINE
> def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
>
> +config MAKE_VERSION_INT

It might be cleaner to make this "config MAKE_VERSION". It will not
conflict with the builtin MAKE_VERSION because this is really
CONFIG_MAKE_VERSION, which is how MAKE_VERSION will be handled in Kconfig.

> + int
> + default $(make-version)
> +
> config CONSTRUCTORS
> bool
>
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index 0496efd6e117..f956953d0236 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -63,3 +63,6 @@ ld-version := $(shell,set -- $(ld-info) && echo $2)
> cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
> m32-flag := $(cc-option-bit,-m32)
> m64-flag := $(cc-option-bit,-m64)
> +
> +# Get the GNU make version with a canonical digit.
> +make-version := $(shell,$(srctree)/scripts/make-version.sh $(MAKE_VERSION))

It might be better for this to just be used directly by "config
MAKE_VERSION":

config MAKE_VERSION
int
default $(shell,$(srctree)/scripts/make-version.sh $(MAKE_VERSION))

> diff --git a/scripts/make-version.sh b/scripts/make-version.sh
> new file mode 100755
> index 000000000000..ce5af96696cc
> --- /dev/null
> +++ b/scripts/make-version.sh
> @@ -0,0 +1,13 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Print the linker name and its version in a 5 or 6-digit form.
> +
> +set -e
> +
> +# Convert the version string x.y.z to a canonical 5 or 6-digit form.
> +IFS=.
> +set -- $1
> +
> +# If the 2nd or 3rd field is missing, fill it with a zero.
> +echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
>

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