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kbuild: check the minimum compiler version in Kconfig
Paul Gortmaker reported a regression in the GCC version check. [1]
If you use GCC 4.8, the build breaks before showing the error message
"error Sorry, your version of GCC is too old - please use 4.9 or newer."
I do not want to apply his fix-up since it implies we would not be able
to remove any cc-option test. Anyway, I admit checking the GCC version
in <linux/compiler-gcc.h> is too late.
Almost at the same time, Linus also suggested to move the compiler
version error to Kconfig time. [2]
I unified the two similar scripts, gcc-version.sh and clang-version.sh
into cc-version.sh. The old scripts invoked the compiler multiple times
(3 times for gcc-version.sh, 4 times for clang-version.sh). I refactored
the code so the new one invokes the compiler just once, and also tried
my best to use shell-builtin commands where possible.
The new script runs faster.
$ time ./scripts/clang-version.sh clang
120000
real 0m0.029s
user 0m0.012s
sys 0m0.021s
$ time ./scripts/cc-version.sh clang
Clang 120000
real 0m0.009s
user 0m0.006s
sys 0m0.004s
cc-version.sh also shows an error message if the compiler is too old:
$ make defconfig CC=clang-9
*** Default configuration is based on 'x86_64_defconfig'
***
*** Compiler is too old.
*** Your Clang version: 9.0.1
*** Minimum Clang version: 10.0.1
***
scripts/Kconfig.include:46: Sorry, this compiler is not supported.
make[1]: *** [scripts/kconfig/Makefile:81: defconfig] Error 1
make: *** [Makefile:602: defconfig] Error 2
The new script takes care of ICC because we have <linux/compiler-intel.h>
although I am not sure if building the kernel with ICC is well-supported.
[1]: https://lore.kernel.org/r/20210110190807.134996-1-paul.gortmaker@windriver.com
[2]: https://lore.kernel.org/r/CAHk-=wh-+TMHPTFo1qs-MYyK7tZh-OQovA=pP3=e06aCVp6_kA@mail.gmail.com
Fixes: 87de84c914 ("kbuild: remove cc-option test of -Werror=date-time")
Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Tested-by: Miguel Ojeda <ojeda@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada
parent
052c805a18
commit
aec6c60a01
@ -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/clang-version.sh
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F: scripts/lld-version.sh
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K: \b(?i:clang|llvm)\b
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@ -3,16 +3,6 @@
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#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
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#endif
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#define CLANG_VERSION (__clang_major__ * 10000 \
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+ __clang_minor__ * 100 \
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+ __clang_patchlevel__)
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#if CLANG_VERSION < 100001
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#ifndef __BPF_TRACING__
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# error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
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#endif
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#endif
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/* Compiler specific definitions for Clang compiler */
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/* same as gcc, this was present in clang-2.6 so we can assume it works
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@ -10,17 +10,6 @@
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+ __GNUC_MINOR__ * 100 \
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+ __GNUC_PATCHLEVEL__)
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/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 */
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#if GCC_VERSION < 40900
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# error Sorry, your version of GCC is too old - please use 4.9 or newer.
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#elif defined(CONFIG_ARM64) && GCC_VERSION < 50100
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/*
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
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* https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.uk
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*/
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# error Sorry, your version of GCC is too old - please use 5.1 or newer.
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#endif
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/*
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* This macro obfuscates arithmetic on a variable address so that gcc
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* shouldn't recognize the original var, and make assumptions about it.
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@ -26,11 +26,11 @@ config CC_VERSION_TEXT
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and then every file will be rebuilt.
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config CC_IS_GCC
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def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc)
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def_bool $(success,test "$(cc-name)" = GCC)
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config GCC_VERSION
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int
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default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
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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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@ -38,14 +38,15 @@ config LD_VERSION
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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 $(success,echo "$(CC_VERSION_TEXT)" | grep -q 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 $(shell,$(srctree)/scripts/clang-version.sh $(CC))
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default $(cc-version) if CC_IS_CLANG
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default 0
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config LLD_VERSION
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int
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@ -39,6 +39,12 @@ as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler
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$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
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$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
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# Get the compiler name, version, and error out if it is not supported.
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cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC))
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$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not supported.)
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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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82
scripts/cc-version.sh
Executable file
82
scripts/cc-version.sh
Executable file
@ -0,0 +1,82 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Print the compiler 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 compiler version, please update
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# Documentation/process/changes.rst as well.
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gcc_min_version=4.9.0
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clang_min_version=10.0.1
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icc_min_version=16.0.3 # temporary
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
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# https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.uk
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if [ "$SRCARCH" = arm64 ]; then
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gcc_min_version=5.1.0
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fi
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# Print the compiler name and some version components.
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get_compiler_info()
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{
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cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
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#if defined(__clang__)
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Clang __clang_major__ __clang_minor__ __clang_patchlevel__
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#elif defined(__INTEL_COMPILER)
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ICC __INTEL_COMPILER __INTEL_COMPILER_UPDATE
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#elif defined(__GNUC__)
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GCC __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__
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#else
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unknown
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#endif
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EOF
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}
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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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echo $((10000 * $1 + 100 * $2 + $3))
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}
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# $@ instead of $1 because multiple words might be given, e.g. CC="ccache gcc".
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orig_args="$@"
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set -- $(get_compiler_info "$@")
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name=$1
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case "$name" in
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GCC)
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version=$2.$3.$4
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min_version=$gcc_min_version
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;;
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Clang)
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version=$2.$3.$4
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min_version=$clang_min_version
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;;
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ICC)
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version=$(($2 / 100)).$(($2 % 100)).$3
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min_version=$icc_min_version
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;;
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*)
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echo "$orig_args: unknown compiler" >&2
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exit 1
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;;
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esac
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cversion=$(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 "*** Compiler is too old."
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echo >&2 "*** Your $name version: $version"
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echo >&2 "*** Minimum $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 $cversion
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@ -1,19 +0,0 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# clang-version clang-command
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#
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# Print the compiler version of `clang-command' in a 5 or 6-digit form
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# such as `50001' for clang-5.0.1 etc.
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compiler="$*"
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if ! ( $compiler --version | grep -q clang) ; then
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echo 0
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exit 1
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fi
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MAJOR=$(echo __clang_major__ | $compiler -E -x c - | tail -n 1)
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MINOR=$(echo __clang_minor__ | $compiler -E -x c - | tail -n 1)
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PATCHLEVEL=$(echo __clang_patchlevel__ | $compiler -E -x c - | tail -n 1)
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printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
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@ -1,20 +0,0 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# gcc-version gcc-command
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#
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# Print the gcc version of `gcc-command' in a 5 or 6-digit form
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# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc.
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compiler="$*"
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if [ ${#compiler} -eq 0 ]; then
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echo "Error: No compiler specified." >&2
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printf "Usage:\n\t$0 <gcc-command>\n" >&2
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exit 1
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fi
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MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1)
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MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1)
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PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1)
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printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
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