[PATCH 1/2] kbuild: Check version of objdump

[Conor Dooley]

On Mon, Dec 16, 2024 at 03:12:51PM -0800, Charlie Jenkins wrote:
> Similar to ld-version, add a way to check the version of objdump. This
> should most of the time end up being the binutils version or the llvm
> version.
> 
> Signed-off-by: Charlie Jenkins <charlie at rivosinc.com>

This fails for allmodconfig and rv32_defconfig with clang. 19.1.1
according to Bjorn :)

Cheers,
Conor.

> ---
>  init/Kconfig               | 10 +++++++
>  scripts/Kconfig.include    |  6 ++++
>  scripts/objdump-version.sh | 69 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 85 insertions(+)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index a20e6efd3f0fbdd7f0df2448854cc30734a0ee4f..0b5d36f939e1de89c12ebdd61e4815015314d4f1 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -60,6 +60,16 @@ config LLD_VERSION
>  	default $(ld-version) if LD_IS_LLD
>  	default 0
>  
> +config OBJDUMP_IS_GNU
> +	def_bool $(success,test "$(objdump-name)" = objdump)
> +
> +config OBJDUMP_IS_LLVM
> +	def_bool $(success,test "$(objdump-name)" = llvm-objdump)
> +
> +config OBJDUMP_VERSION
> +	int
> +	default $(objdump-version)
> +
>  config RUSTC_VERSION
>  	int
>  	default $(rustc-version)
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index 33193ca6e8030e659d6b321acaea1acd42c387a4..cb3e2d2564fea8cce780adb3be672c9596b7ccf2 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -58,6 +58,12 @@ $(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supp
>  ld-name := $(shell,set -- $(ld-info) && echo $1)
>  ld-version := $(shell,set -- $(ld-info) && echo $2)
>  
> +# Get the objdump name, version, and error out if it is not supported.
> +objdump-info := $(shell,$(srctree)/scripts/objdump-version.sh $(OBJDUMP))
> +$(error-if,$(success,test -z "$(objdump-info)"),Sorry$(comma) this objdump is not supported.)
> +objdump-name := $(shell,set -- $(objdump-info) && echo $1)
> +objdump-version := $(shell,set -- $(objdump-info) && echo $2)
> +
>  # machine bit flags
>  #  $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
>  #  $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
> diff --git a/scripts/objdump-version.sh b/scripts/objdump-version.sh
> new file mode 100755
> index 0000000000000000000000000000000000000000..fa24f8dc2d3c42fd1195fceb3c96b27f7127db25
> --- /dev/null
> +++ b/scripts/objdump-version.sh
> @@ -0,0 +1,69 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Print the objdump name and its version in a 5 or 6-digit form.
> +# Also, perform the minimum version check.
> +
> +set -e
> +
> +# 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 -- $(LC_ALL=C "$@" --version)
> +
> +# Split the line on spaces.
> +IFS=' '
> +set -- $1
> +
> +min_tool_version=$(dirname $0)/min-tool-version.sh
> +
> +if [ "$1" = GNU -a "$2" = objdump ]; then
> +	shift $(($# - 1))
> +	version=$1
> +	min_version=$($min_tool_version binutils)
> +	disp_name="GNU objdump"
> +else
> +	while [ $# -gt 1 -a "$1" != "LLVM" ]; do
> +		shift
> +	done
> +
> +	if [ "$1" = LLVM ]; then
> +		version=$3
> +		min_version=$($min_tool_version llvm)
> +		disp_name="llvm-objdump"
> +	else
> +		echo "$orig_args: unknown objdump" >&2
> +		exit 1
> +	fi
> +fi
> +
> +version=${version%%[!0-9.]*}
> +
> +cversion=$(get_canonical_version $version)
> +min_cversion=$(get_canonical_version $min_version)
> +
> +if [ "$cversion" -lt "$min_cversion" ]; then
> +	echo >&2 "***"
> +	echo >&2 "*** objdump is too old."
> +	echo >&2 "***   Your $disp_name version:    $version"
> +	echo >&2 "***   Minimum $disp_name version: $min_version"
> +	echo >&2 "***"
> +	exit 1
> +fi
> +
> +echo objdump $cversion
> 
> -- 
> 2.34.1
> 
> 
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