2 # SPDX-License-Identifier: GPL-2.0
12 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
17 # Fix the language to get consistent output
21 if [ -z "$KBUILD_BUILD_VERSION" ]; then
22 VERSION=$(cat .version 2>/dev/null || echo 1)
24 VERSION=$KBUILD_BUILD_VERSION
27 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
30 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
32 if test -z "$KBUILD_BUILD_USER"; then
33 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
35 LINUX_COMPILE_BY=$KBUILD_BUILD_USER
37 if test -z "$KBUILD_BUILD_HOST"; then
38 LINUX_COMPILE_HOST=`hostname`
40 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
43 UTS_VERSION="#$VERSION"
45 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
46 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
47 if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
49 # Truncate to maximum length
51 UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)"
53 # Generate a temporary compile.h
55 { echo /\* This file is auto generated, version $VERSION \*/
56 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
58 echo \#define UTS_MACHINE \"$ARCH\"
60 echo \#define UTS_VERSION \"$UTS_VERSION\"
62 printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
63 echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
65 LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \
66 | sed 's/[[:space:]]*$//')
67 printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"
70 # Only replace the real compile.h if the new one is different,
71 # in order to preserve the timestamp and avoid unnecessary
73 # We don't consider the file changed if only the date/time changed.
74 # A kernel config change will increase the generation number, thus
75 # causing compile.h to be updated (including date/time) due to the
76 # changed comment in the
79 if [ -r $TARGET ] && \
80 grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
81 grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
82 cmp -s .tmpver.1 .tmpver.2; then
86 mv -f .tmpcompile $TARGET
88 rm -f .tmpver.1 .tmpver.2