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- #!/bin/sh
- # SPDX-License-Identifier: GPL-2.0
- TARGET=$1
- ARCH=$2
- SMP=$3
- PREEMPT=$4
- PREEMPT_RT=$5
- CC_VERSION="$6"
- LD=$7
- vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
- # Do not expand names
- set -f
- # Fix the language to get consistent output
- LC_ALL=C
- export LC_ALL
- if [ -z "$KBUILD_BUILD_VERSION" ]; then
- VERSION=$(cat .version 2>/dev/null || echo 1)
- else
- VERSION=$KBUILD_BUILD_VERSION
- fi
- if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
- TIMESTAMP=`date`
- else
- TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
- fi
- if test -z "$KBUILD_BUILD_USER"; then
- LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
- else
- LINUX_COMPILE_BY=$KBUILD_BUILD_USER
- fi
- if test -z "$KBUILD_BUILD_HOST"; then
- LINUX_COMPILE_HOST=`uname -n`
- else
- LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
- fi
- UTS_VERSION="#$VERSION"
- CONFIG_FLAGS=""
- if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
- if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
- if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
- # Truncate to maximum length
- UTS_LEN=64
- UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)"
- # Generate a temporary compile.h
- { echo /\* This file is auto generated, version $VERSION \*/
- if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
- echo \#define UTS_MACHINE \"$ARCH\"
- echo \#define UTS_VERSION \"$UTS_VERSION\"
- printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
- echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
- LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \
- | sed 's/[[:space:]]*$//')
- printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"
- } > .tmpcompile
- # Only replace the real compile.h if the new one is different,
- # in order to preserve the timestamp and avoid unnecessary
- # recompilations.
- # We don't consider the file changed if only the date/time changed,
- # unless KBUILD_BUILD_TIMESTAMP was explicitly set (e.g. for
- # reproducible builds with that value referring to a commit timestamp).
- # A kernel config change will increase the generation number, thus
- # causing compile.h to be updated (including date/time) due to the
- # changed comment in the
- # first line.
- if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
- IGNORE_PATTERN="UTS_VERSION"
- else
- IGNORE_PATTERN="NOT_A_PATTERN_TO_BE_MATCHED"
- fi
- if [ -r $TARGET ] && \
- grep -v $IGNORE_PATTERN $TARGET > .tmpver.1 && \
- grep -v $IGNORE_PATTERN .tmpcompile > .tmpver.2 && \
- cmp -s .tmpver.1 .tmpver.2; then
- rm -f .tmpcompile
- else
- vecho " UPD $TARGET"
- mv -f .tmpcompile $TARGET
- fi
- rm -f .tmpver.1 .tmpver.2
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