* Re: [PATCH 2/2] kbuild: check the minimum linker version in Kconfig
2021-02-16 3:10 ` [PATCH 2/2] kbuild: check the minimum linker version in Kconfig Masahiro Yamada
@ 2021-02-16 17:49 ` Nick Desaulniers
2021-02-16 19:07 ` Nathan Chancellor
2021-02-21 17:10 ` Masahiro Yamada
2 siblings, 0 replies; 6+ messages in thread
From: Nick Desaulniers @ 2021-02-16 17:49 UTC (permalink / raw)
To: Masahiro Yamada
Cc: Linux Kbuild mailing list, David Laight, Andrew Morton,
Daniel Borkmann, Johannes Weiner, KP Singh, Kees Cook,
Masami Hiramatsu, Nathan Chancellor, Nick Terrell, Quentin Perret,
Thomas Bogendoerfer, Valentin Schneider, Will Deacon, LKML
On Mon, Feb 15, 2021 at 7:10 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> Unify the two scripts/ld-version.sh and scripts/lld-version.sh, and
> check the minimum linker version like scripts/cc-version.sh did.
>
> I tested this script for some corner cases reported in the past:
>
> - GNU ld version 2.25-15.fc23
> as reported by commit 8083013fc320 ("ld-version: Fix it on Fedora")
>
> - GNU ld (GNU Binutils) 2.20.1.20100303
> as reported by commit 0d61ed17dd30 ("ld-version: Drop the 4th and
> 5th version components")
>
> This script show an error message if the linker is too old:
>
> $ make LD=ld.lld-9
> SYNC include/config/auto.conf
> ***
> *** Linker is too old.
> *** Your LLD version: 9.0.1
> *** Minimum LLD version: 10.0.1
> ***
> scripts/Kconfig.include:50: Sorry, this linker is not supported.
> make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
> make[1]: *** [Makefile:600: syncconfig] Error 2
> make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> I also moved the check for gold to this script, so gold is still rejected:
>
> $ make LD=gold
> SYNC include/config/auto.conf
> gold linker is not supported as it is not capable of linking the kernel proper.
> scripts/Kconfig.include:50: Sorry, this linker is not supported.
> make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
> make[1]: *** [Makefile:600: syncconfig] Error 2
> make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> Thanks to David Laight for suggesting shell script improvements.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
>
> MAINTAINERS | 1 -
> init/Kconfig | 21 +++++++----
> scripts/Kconfig.include | 7 +++-
> scripts/ld-version.sh | 82 ++++++++++++++++++++++++++++++++++++-----
> scripts/lld-version.sh | 20 ----------
> 5 files changed, 90 insertions(+), 41 deletions(-)
> delete mode 100755 scripts/lld-version.sh
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index df820969be1f..6b82ad6990b7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4314,7 +4314,6 @@ C: irc://chat.freenode.net/clangbuiltlinux
> F: Documentation/kbuild/llvm.rst
> F: include/linux/compiler-clang.h
> F: scripts/clang-tools/
> -F: scripts/lld-version.sh
> K: \b(?i:clang|llvm)\b
>
> CLEANCACHE API
> diff --git a/init/Kconfig b/init/Kconfig
> index 7bcfa24524c2..42b69ee29dca 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -33,24 +33,29 @@ config GCC_VERSION
> default $(cc-version) if CC_IS_GCC
> default 0
>
> -config LD_VERSION
> - int
> - default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
> -
> config CC_IS_CLANG
> def_bool $(success,test "$(cc-name)" = Clang)
>
> -config LD_IS_LLD
> - def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)
> -
> config CLANG_VERSION
> int
> default $(cc-version) if CC_IS_CLANG
> default 0
>
> +config LD_IS_BFD
> + def_bool $(success,test "$(ld-name)" = BFD)
> +
> +config LD_VERSION
> + int
> + default $(ld-version) if LD_IS_BFD
> + default 0
> +
> +config LD_IS_LLD
> + def_bool $(success,test "$(ld-name)" = LLD)
> +
> config LLD_VERSION
> int
> - default $(shell,$(srctree)/scripts/lld-version.sh $(LD))
> + default $(ld-version) if LD_IS_LLD
> + default 0
>
> config CC_CAN_LINK
> bool
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index 0228cb9c74aa..58fdb5308725 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -45,8 +45,11 @@ $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not su
> cc-name := $(shell,set -- $(cc-info) && echo $1)
> cc-version := $(shell,set -- $(cc-info) && echo $2)
>
> -# Fail if the linker is gold as it's not capable of linking the kernel proper
> -$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
> +# Get the linker name, version, and error out if it is not supported.
> +ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
> +$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
> +ld-name := $(shell,set -- $(ld-info) && echo $1)
> +ld-version := $(shell,set -- $(ld-info) && echo $2)
>
> # machine bit flags
> # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
> diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
> index 0f8a2c0f9502..a463273509b5 100755
> --- a/scripts/ld-version.sh
> +++ b/scripts/ld-version.sh
> @@ -1,11 +1,73 @@
> -#!/usr/bin/awk -f
> +#!/bin/sh
> # SPDX-License-Identifier: GPL-2.0
> -# extract linker version number from stdin and turn into single number
> - {
> - gsub(".*\\)", "");
> - gsub(".*version ", "");
> - gsub("-.*", "");
> - split($1,a, ".");
> - print a[1]*10000 + a[2]*100 + a[3];
> - exit
> - }
> +#
> +# Print the linker name and its version in a 5 or 6-digit form.
> +# Also, perform the minimum version check.
> +
> +set -e
> +
> +# When you raise the minimum linker version, please update
> +# Documentation/process/changes.rst as well.
> +bfd_min_version=2.23.0
> +lld_min_version=10.0.1
> +
> +# Convert the version string x.y.z to a canonical 5 or 6-digit form.
> +get_canonical_version()
> +{
> + IFS=.
> + set -- $1
> +
> + # If the 2nd or 3rd field is missing, fill it with a zero.
> + #
> + # The 4th field, if present, is ignored.
> + # This occurs in development snapshots as in 2.35.1.20201116
> + echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
> +}
> +
> +orig_args="$@"
> +
> +# Get the first line of the --version output.
> +IFS='
> +'
> +set -- $("$@" --version)
> +
> +# Split the line on spaces.
> +IFS=' '
> +set -- $1
> +
> +if [ "$1" = GNU -a "$2" = ld ]; then
> + shift $(($# - 1))
> + version=$1
> + min_version=$bfd_min_version
> + name=BFD
> + disp_name="GNU ld"
> +elif [ "$1" = GNU -a "$2" = gold ]; then
> + echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
> + exit 1
> +elif [ "$1" = LLD ]; then
> + version=$2
> + min_version=$lld_min_version
> + name=LLD
> + disp_name=LLD
> +else
> + echo "$orig_args: unknown linker" >&2
> + exit 1
> +fi
> +
> +# Some distributions append a package release number, as in 2.34-4.fc32
> +# Trim the hyphen and any characters that follow.
> +version=${version%-*}
> +
> +cversion=$(get_canonical_version $version)
> +min_cversion=$(get_canonical_version $min_version)
> +
> +if [ "$cversion" -lt "$min_cversion" ]; then
> + echo >&2 "***"
> + echo >&2 "*** Linker is too old."
> + echo >&2 "*** Your $disp_name version: $version"
> + echo >&2 "*** Minimum $disp_name version: $min_version"
> + echo >&2 "***"
> + exit 1
> +fi
> +
> +echo $name $cversion
> diff --git a/scripts/lld-version.sh b/scripts/lld-version.sh
> deleted file mode 100755
> index d70edb4d8a4f..000000000000
> --- a/scripts/lld-version.sh
> +++ /dev/null
> @@ -1,20 +0,0 @@
> -#!/bin/sh
> -# SPDX-License-Identifier: GPL-2.0
> -#
> -# Usage: $ ./scripts/lld-version.sh ld.lld
> -#
> -# Print the linker version of `ld.lld' in a 5 or 6-digit form
> -# such as `100001' for ld.lld 10.0.1 etc.
> -
> -linker_string="$($* --version)"
> -
> -if ! ( echo $linker_string | grep -q LLD ); then
> - echo 0
> - exit 1
> -fi
> -
> -VERSION=$(echo $linker_string | cut -d ' ' -f 2)
> -MAJOR=$(echo $VERSION | cut -d . -f 1)
> -MINOR=$(echo $VERSION | cut -d . -f 2)
> -PATCHLEVEL=$(echo $VERSION | cut -d . -f 3)
> -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
> --
> 2.27.0
>
--
Thanks,
~Nick Desaulniers
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 2/2] kbuild: check the minimum linker version in Kconfig
2021-02-16 3:10 ` [PATCH 2/2] kbuild: check the minimum linker version in Kconfig Masahiro Yamada
2021-02-16 17:49 ` Nick Desaulniers
@ 2021-02-16 19:07 ` Nathan Chancellor
2021-02-21 17:10 ` Masahiro Yamada
2 siblings, 0 replies; 6+ messages in thread
From: Nathan Chancellor @ 2021-02-16 19:07 UTC (permalink / raw)
To: Masahiro Yamada
Cc: linux-kbuild, David Laight, Andrew Morton, Daniel Borkmann,
Johannes Weiner, KP Singh, Kees Cook, Masami Hiramatsu,
Nick Desaulniers, Nick Terrell, Quentin Perret,
Thomas Bogendoerfer, Valentin Schneider, Will Deacon,
linux-kernel
On Tue, Feb 16, 2021 at 12:10:04PM +0900, Masahiro Yamada wrote:
> Unify the two scripts/ld-version.sh and scripts/lld-version.sh, and
> check the minimum linker version like scripts/cc-version.sh did.
>
> I tested this script for some corner cases reported in the past:
>
> - GNU ld version 2.25-15.fc23
> as reported by commit 8083013fc320 ("ld-version: Fix it on Fedora")
>
> - GNU ld (GNU Binutils) 2.20.1.20100303
> as reported by commit 0d61ed17dd30 ("ld-version: Drop the 4th and
> 5th version components")
>
> This script show an error message if the linker is too old:
>
> $ make LD=ld.lld-9
> SYNC include/config/auto.conf
> ***
> *** Linker is too old.
> *** Your LLD version: 9.0.1
> *** Minimum LLD version: 10.0.1
> ***
> scripts/Kconfig.include:50: Sorry, this linker is not supported.
> make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
> make[1]: *** [Makefile:600: syncconfig] Error 2
> make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> I also moved the check for gold to this script, so gold is still rejected:
>
> $ make LD=gold
> SYNC include/config/auto.conf
> gold linker is not supported as it is not capable of linking the kernel proper.
> scripts/Kconfig.include:50: Sorry, this linker is not supported.
> make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
> make[1]: *** [Makefile:600: syncconfig] Error 2
> make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> Thanks to David Laight for suggesting shell script improvements.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
> ---
>
> MAINTAINERS | 1 -
> init/Kconfig | 21 +++++++----
> scripts/Kconfig.include | 7 +++-
> scripts/ld-version.sh | 82 ++++++++++++++++++++++++++++++++++++-----
> scripts/lld-version.sh | 20 ----------
> 5 files changed, 90 insertions(+), 41 deletions(-)
> delete mode 100755 scripts/lld-version.sh
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index df820969be1f..6b82ad6990b7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4314,7 +4314,6 @@ C: irc://chat.freenode.net/clangbuiltlinux
> F: Documentation/kbuild/llvm.rst
> F: include/linux/compiler-clang.h
> F: scripts/clang-tools/
> -F: scripts/lld-version.sh
> K: \b(?i:clang|llvm)\b
>
> CLEANCACHE API
> diff --git a/init/Kconfig b/init/Kconfig
> index 7bcfa24524c2..42b69ee29dca 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -33,24 +33,29 @@ config GCC_VERSION
> default $(cc-version) if CC_IS_GCC
> default 0
>
> -config LD_VERSION
> - int
> - default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
> -
> config CC_IS_CLANG
> def_bool $(success,test "$(cc-name)" = Clang)
>
> -config LD_IS_LLD
> - def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)
> -
> config CLANG_VERSION
> int
> default $(cc-version) if CC_IS_CLANG
> default 0
>
> +config LD_IS_BFD
> + def_bool $(success,test "$(ld-name)" = BFD)
> +
> +config LD_VERSION
> + int
> + default $(ld-version) if LD_IS_BFD
> + default 0
> +
> +config LD_IS_LLD
> + def_bool $(success,test "$(ld-name)" = LLD)
> +
> config LLD_VERSION
> int
> - default $(shell,$(srctree)/scripts/lld-version.sh $(LD))
> + default $(ld-version) if LD_IS_LLD
> + default 0
>
> config CC_CAN_LINK
> bool
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index 0228cb9c74aa..58fdb5308725 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -45,8 +45,11 @@ $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not su
> cc-name := $(shell,set -- $(cc-info) && echo $1)
> cc-version := $(shell,set -- $(cc-info) && echo $2)
>
> -# Fail if the linker is gold as it's not capable of linking the kernel proper
> -$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
> +# Get the linker name, version, and error out if it is not supported.
> +ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
> +$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
> +ld-name := $(shell,set -- $(ld-info) && echo $1)
> +ld-version := $(shell,set -- $(ld-info) && echo $2)
>
> # machine bit flags
> # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
> diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
> index 0f8a2c0f9502..a463273509b5 100755
> --- a/scripts/ld-version.sh
> +++ b/scripts/ld-version.sh
> @@ -1,11 +1,73 @@
> -#!/usr/bin/awk -f
> +#!/bin/sh
> # SPDX-License-Identifier: GPL-2.0
> -# extract linker version number from stdin and turn into single number
> - {
> - gsub(".*\\)", "");
> - gsub(".*version ", "");
> - gsub("-.*", "");
> - split($1,a, ".");
> - print a[1]*10000 + a[2]*100 + a[3];
> - exit
> - }
> +#
> +# Print the linker name and its version in a 5 or 6-digit form.
> +# Also, perform the minimum version check.
> +
> +set -e
> +
> +# When you raise the minimum linker version, please update
> +# Documentation/process/changes.rst as well.
> +bfd_min_version=2.23.0
> +lld_min_version=10.0.1
> +
> +# Convert the version string x.y.z to a canonical 5 or 6-digit form.
> +get_canonical_version()
> +{
> + IFS=.
> + set -- $1
> +
> + # If the 2nd or 3rd field is missing, fill it with a zero.
> + #
> + # The 4th field, if present, is ignored.
> + # This occurs in development snapshots as in 2.35.1.20201116
> + echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
> +}
> +
> +orig_args="$@"
> +
> +# Get the first line of the --version output.
> +IFS='
> +'
> +set -- $("$@" --version)
> +
> +# Split the line on spaces.
> +IFS=' '
> +set -- $1
> +
> +if [ "$1" = GNU -a "$2" = ld ]; then
> + shift $(($# - 1))
> + version=$1
> + min_version=$bfd_min_version
> + name=BFD
> + disp_name="GNU ld"
> +elif [ "$1" = GNU -a "$2" = gold ]; then
> + echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
> + exit 1
> +elif [ "$1" = LLD ]; then
> + version=$2
> + min_version=$lld_min_version
> + name=LLD
> + disp_name=LLD
> +else
> + echo "$orig_args: unknown linker" >&2
> + exit 1
> +fi
> +
> +# Some distributions append a package release number, as in 2.34-4.fc32
> +# Trim the hyphen and any characters that follow.
> +version=${version%-*}
> +
> +cversion=$(get_canonical_version $version)
> +min_cversion=$(get_canonical_version $min_version)
> +
> +if [ "$cversion" -lt "$min_cversion" ]; then
> + echo >&2 "***"
> + echo >&2 "*** Linker is too old."
> + echo >&2 "*** Your $disp_name version: $version"
> + echo >&2 "*** Minimum $disp_name version: $min_version"
> + echo >&2 "***"
> + exit 1
> +fi
> +
> +echo $name $cversion
> diff --git a/scripts/lld-version.sh b/scripts/lld-version.sh
> deleted file mode 100755
> index d70edb4d8a4f..000000000000
> --- a/scripts/lld-version.sh
> +++ /dev/null
> @@ -1,20 +0,0 @@
> -#!/bin/sh
> -# SPDX-License-Identifier: GPL-2.0
> -#
> -# Usage: $ ./scripts/lld-version.sh ld.lld
> -#
> -# Print the linker version of `ld.lld' in a 5 or 6-digit form
> -# such as `100001' for ld.lld 10.0.1 etc.
> -
> -linker_string="$($* --version)"
> -
> -if ! ( echo $linker_string | grep -q LLD ); then
> - echo 0
> - exit 1
> -fi
> -
> -VERSION=$(echo $linker_string | cut -d ' ' -f 2)
> -MAJOR=$(echo $VERSION | cut -d . -f 1)
> -MINOR=$(echo $VERSION | cut -d . -f 2)
> -PATCHLEVEL=$(echo $VERSION | cut -d . -f 3)
> -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
> --
> 2.27.0
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 2/2] kbuild: check the minimum linker version in Kconfig
2021-02-16 3:10 ` [PATCH 2/2] kbuild: check the minimum linker version in Kconfig Masahiro Yamada
2021-02-16 17:49 ` Nick Desaulniers
2021-02-16 19:07 ` Nathan Chancellor
@ 2021-02-21 17:10 ` Masahiro Yamada
2 siblings, 0 replies; 6+ messages in thread
From: Masahiro Yamada @ 2021-02-21 17:10 UTC (permalink / raw)
To: Linux Kbuild mailing list
Cc: David Laight, Andrew Morton, Daniel Borkmann, Johannes Weiner,
KP Singh, Kees Cook, Masami Hiramatsu, Nathan Chancellor,
Nick Desaulniers, Nick Terrell, Quentin Perret,
Thomas Bogendoerfer, Valentin Schneider, Will Deacon,
Linux Kernel Mailing List
On Tue, Feb 16, 2021 at 12:11 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> Unify the two scripts/ld-version.sh and scripts/lld-version.sh, and
> check the minimum linker version like scripts/cc-version.sh did.
>
> I tested this script for some corner cases reported in the past:
>
> - GNU ld version 2.25-15.fc23
> as reported by commit 8083013fc320 ("ld-version: Fix it on Fedora")
>
> - GNU ld (GNU Binutils) 2.20.1.20100303
> as reported by commit 0d61ed17dd30 ("ld-version: Drop the 4th and
> 5th version components")
>
> This script show an error message if the linker is too old:
>
> $ make LD=ld.lld-9
> SYNC include/config/auto.conf
> ***
> *** Linker is too old.
> *** Your LLD version: 9.0.1
> *** Minimum LLD version: 10.0.1
> ***
> scripts/Kconfig.include:50: Sorry, this linker is not supported.
> make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
> make[1]: *** [Makefile:600: syncconfig] Error 2
> make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> I also moved the check for gold to this script, so gold is still rejected:
>
> $ make LD=gold
> SYNC include/config/auto.conf
> gold linker is not supported as it is not capable of linking the kernel proper.
> scripts/Kconfig.include:50: Sorry, this linker is not supported.
> make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
> make[1]: *** [Makefile:600: syncconfig] Error 2
> make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> Thanks to David Laight for suggesting shell script improvements.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
Applied to linux-kbuild.
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 6+ messages in thread