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kbuild: check the minimum linker version in Kconfig
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 commit8083013fc3("ld-version: Fix it on Fedora") - GNU ld (GNU Binutils) 2.20.1.20100303 as reported by commit0d61ed17dd("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> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Tested-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Masahiro Yamada
parent
05f6bbf2d7
commit
02aff85922
5 changed files with 90 additions and 41 deletions
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@ -4314,7 +4314,6 @@ C: irc://chat.freenode.net/clangbuiltlinux
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F: Documentation/kbuild/llvm.rst
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F: include/linux/compiler-clang.h
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F: scripts/clang-tools/
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F: scripts/lld-version.sh
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K: \b(?i:clang|llvm)\b
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CLEANCACHE API
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21
init/Kconfig
21
init/Kconfig
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@ -33,24 +33,29 @@ config GCC_VERSION
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default $(cc-version) if CC_IS_GCC
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default 0
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config LD_VERSION
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int
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default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
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config CC_IS_CLANG
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def_bool $(success,test "$(cc-name)" = Clang)
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config LD_IS_LLD
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def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)
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config CLANG_VERSION
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int
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default $(cc-version) if CC_IS_CLANG
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default 0
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config LD_IS_BFD
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def_bool $(success,test "$(ld-name)" = BFD)
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config LD_VERSION
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int
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default $(ld-version) if LD_IS_BFD
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default 0
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config LD_IS_LLD
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def_bool $(success,test "$(ld-name)" = LLD)
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config LLD_VERSION
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int
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default $(shell,$(srctree)/scripts/lld-version.sh $(LD))
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default $(ld-version) if LD_IS_LLD
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default 0
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config CC_CAN_LINK
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bool
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@ -45,8 +45,11 @@ $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not su
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cc-name := $(shell,set -- $(cc-info) && echo $1)
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cc-version := $(shell,set -- $(cc-info) && echo $2)
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# Fail if the linker is gold as it's not capable of linking the kernel proper
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$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
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# Get the linker name, version, and error out if it is not supported.
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ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
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$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
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ld-name := $(shell,set -- $(ld-info) && echo $1)
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ld-version := $(shell,set -- $(ld-info) && echo $2)
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# machine bit flags
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# $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
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@ -1,11 +1,73 @@
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#!/usr/bin/awk -f
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# extract linker version number from stdin and turn into single number
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{
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gsub(".*\\)", "");
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gsub(".*version ", "");
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gsub("-.*", "");
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split($1,a, ".");
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print a[1]*10000 + a[2]*100 + a[3];
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exit
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}
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#
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# Print the linker name and its version in a 5 or 6-digit form.
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# Also, perform the minimum version check.
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set -e
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# When you raise the minimum linker version, please update
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# Documentation/process/changes.rst as well.
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bfd_min_version=2.23.0
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lld_min_version=10.0.1
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# Convert the version string x.y.z to a canonical 5 or 6-digit form.
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get_canonical_version()
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{
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IFS=.
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set -- $1
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# If the 2nd or 3rd field is missing, fill it with a zero.
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#
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# The 4th field, if present, is ignored.
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# This occurs in development snapshots as in 2.35.1.20201116
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echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
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}
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orig_args="$@"
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# Get the first line of the --version output.
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IFS='
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'
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set -- $("$@" --version)
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# Split the line on spaces.
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IFS=' '
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set -- $1
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if [ "$1" = GNU -a "$2" = ld ]; then
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shift $(($# - 1))
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version=$1
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min_version=$bfd_min_version
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name=BFD
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disp_name="GNU ld"
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elif [ "$1" = GNU -a "$2" = gold ]; then
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echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
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exit 1
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elif [ "$1" = LLD ]; then
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version=$2
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min_version=$lld_min_version
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name=LLD
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disp_name=LLD
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else
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echo "$orig_args: unknown linker" >&2
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exit 1
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fi
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# Some distributions append a package release number, as in 2.34-4.fc32
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# Trim the hyphen and any characters that follow.
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version=${version%-*}
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cversion=$(get_canonical_version $version)
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min_cversion=$(get_canonical_version $min_version)
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if [ "$cversion" -lt "$min_cversion" ]; then
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echo >&2 "***"
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echo >&2 "*** Linker is too old."
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echo >&2 "*** Your $disp_name version: $version"
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echo >&2 "*** Minimum $disp_name version: $min_version"
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echo >&2 "***"
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exit 1
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fi
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echo $name $cversion
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@ -1,20 +0,0 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Usage: $ ./scripts/lld-version.sh ld.lld
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#
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# Print the linker version of `ld.lld' in a 5 or 6-digit form
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# such as `100001' for ld.lld 10.0.1 etc.
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linker_string="$($* --version)"
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if ! ( echo $linker_string | grep -q LLD ); then
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echo 0
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exit 1
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fi
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VERSION=$(echo $linker_string | cut -d ' ' -f 2)
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MAJOR=$(echo $VERSION | cut -d . -f 1)
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MINOR=$(echo $VERSION | cut -d . -f 2)
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PATCHLEVEL=$(echo $VERSION | cut -d . -f 3)
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printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
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