Re: [PATCH] kbuild: collect minimum tool versions into scripts/min-tool-version.sh

[Sedat Dilek]

On Thu, Mar 11, 2021 at 10:47 AM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
>
> The kernel build uses various tools, many of which are provided by the
> same software suite, for example, LLVM and Binutils.
>
> When you raise the minimum version of Clang/LLVM, you need to update
> clang_min_version in scripts/cc-version.sh and also lld_min_version in
> scripts/ld-version.sh.
>
> Kbuild can handle CC=clang and LD=ld.lld independently, but it does not
> make much sense to maintain their versions separately.
>
> Let's make scripts/min-tool-version.sh a central place of minimum tool
> versions so you do not need to touch multiple files.
>
> This script prints the minimum version of the given tool.
>
>   $ scripts/min-tool-version.sh gcc
>   4.9.0
>   $ scripts/min-tool-version.sh llvm
>   10.0.1
>   $ scripts/min-tool-version.sh binutils
>   2.23.0
>   $ scripts/min-tool-version.sh foo
>   foo: unknown tool
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>

The idea with creating gcc, llvm, binutils etc. files containing the
minimum version-string sounds good to me.

This version here tested on Debian/testing AMD64.

Tested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> # LLVM/Clang v12.0.0-rc3

- Sedat -

> ---
>
>  scripts/cc-version.sh       | 20 +++++---------------
>  scripts/ld-version.sh       | 11 ++++-------
>  scripts/min-tool-version.sh | 27 +++++++++++++++++++++++++++
>  3 files changed, 36 insertions(+), 22 deletions(-)
>  create mode 100755 scripts/min-tool-version.sh
>
> diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh
> index 3f2ee885b116..f1952c522466 100755
> --- a/scripts/cc-version.sh
> +++ b/scripts/cc-version.sh
> @@ -6,18 +6,6 @@
>
>  set -e
>
> -# When you raise the minimum compiler version, please update
> -# Documentation/process/changes.rst as well.
> -gcc_min_version=4.9.0
> -clang_min_version=10.0.1
> -icc_min_version=16.0.3 # temporary
> -
> -# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
> -# https://lore.kernel.org/r/20210107111841.GN1551@xxxxxxxxxxxxxxxxxxxxx
> -if [ "$SRCARCH" = arm64 ]; then
> -       gcc_min_version=5.1.0
> -fi
> -
>  # Print the compiler name and some version components.
>  get_compiler_info()
>  {
> @@ -48,18 +36,20 @@ set -- $(get_compiler_info "$@")
>
>  name=$1
>
> +min_tool_version=$(dirname $0)/min-tool-version.sh
> +
>  case "$name" in
>  GCC)
>         version=$2.$3.$4
> -       min_version=$gcc_min_version
> +       min_version=$($min_tool_version gcc)
>         ;;
>  Clang)
>         version=$2.$3.$4
> -       min_version=$clang_min_version
> +       min_version=$($min_tool_version llvm)
>         ;;
>  ICC)
>         version=$(($2 / 100)).$(($2 % 100)).$3
> -       min_version=$icc_min_version
> +       min_version=$($min_tool_version icc)
>         ;;
>  *)
>         echo "$orig_args: unknown compiler" >&2
> diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
> index 30debf78aa09..5b9481e98b4f 100755
> --- a/scripts/ld-version.sh
> +++ b/scripts/ld-version.sh
> @@ -6,11 +6,6 @@
>
>  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()
>  {
> @@ -35,10 +30,12 @@ set -- $("$@" --version)
>  IFS=' '
>  set -- $1
>
> +min_tool_version=$(dirname $0)/min-tool-version.sh
> +
>  if [ "$1" = GNU -a "$2" = ld ]; then
>         shift $(($# - 1))
>         version=$1
> -       min_version=$bfd_min_version
> +       min_version=$($min_tool_version binutils)
>         name=BFD
>         disp_name="GNU ld"
>  elif [ "$1" = GNU -a "$2" = gold ]; then
> @@ -51,7 +48,7 @@ else
>
>         if [ "$1" = LLD ]; then
>                 version=$2
> -               min_version=$lld_min_version
> +               min_version=$($min_tool_version llvm)
>                 name=LLD
>                 disp_name=LLD
>         else
> diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
> new file mode 100755
> index 000000000000..37c438d766d7
> --- /dev/null
> +++ b/scripts/min-tool-version.sh
> @@ -0,0 +1,27 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# Print the minimum supported version of the given tool.
> +
> +set -e
> +
> +# When you raise the minimum version, please update
> +# Documentation/process/changes.rst as well.
> +min_gcc_version=4.9.0
> +min_llvm_version=10.0.1
> +min_icc_version=16.0.3 # temporary
> +min_binutils_version=2.23.0
> +
> +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
> +# https://lore.kernel.org/r/20210107111841.GN1551@xxxxxxxxxxxxxxxxxxxxx
> +if [ "$SRCARCH" = arm64 ]; then
> +       min_gcc_version=5.1.0
> +fi
> +
> +eval min_version="\$min_${1}_version"
> +if [ -z "$min_version" ]; then
> +       echo "$1: unknown tool" >&2
> +       exit 1
> +fi
> +
> +echo "$min_version"
> --
> 2.27.0
>
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