2 # SPDX-License-Identifier: GPL-2.0
11 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
13 # If compile.h exists already and we don't own autoconf.h
14 # (i.e. we're not the same user who did make *config), don't
16 # So "sudo make install" won't change the "compiled by <user>"
17 # do "compiled by root"
19 if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
20 vecho " SKIPPED $TARGET"
27 # Fix the language to get consistent output
31 if [ -z "$KBUILD_BUILD_VERSION" ]; then
32 VERSION=$(cat .version 2>/dev/null || echo 1)
34 VERSION=$KBUILD_BUILD_VERSION
37 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
40 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
42 if test -z "$KBUILD_BUILD_USER"; then
43 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
45 LINUX_COMPILE_BY=$KBUILD_BUILD_USER
47 if test -z "$KBUILD_BUILD_HOST"; then
48 LINUX_COMPILE_HOST=`hostname`
50 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
53 UTS_VERSION="#$VERSION"
55 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
56 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
57 if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
58 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
60 # Truncate to maximum length
63 UTS_TRUNCATE="cut -b -$UTS_LEN"
65 # Generate a temporary compile.h
67 { echo /\* This file is auto generated, version $VERSION \*/
68 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
70 echo \#define UTS_MACHINE \"$ARCH\"
72 echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
74 echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
75 echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
77 echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
80 # Only replace the real compile.h if the new one is different,
81 # in order to preserve the timestamp and avoid unnecessary
83 # We don't consider the file changed if only the date/time changed,
84 # unless KBUILD_BUILD_TIMESTAMP was explicitly set (e.g. for
85 # reproducible builds with that value referring to a commit timestamp).
86 # A kernel config change will increase the generation number, thus
87 # causing compile.h to be updated (including date/time) due to the
88 # changed comment in the
91 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
92 IGNORE_PATTERN="UTS_VERSION"
94 IGNORE_PATTERN="NOT_A_PATTERN_TO_BE_MATCHED"
97 if [ -r $TARGET ] && \
98 grep -v $IGNORE_PATTERN $TARGET > .tmpver.1 && \
99 grep -v $IGNORE_PATTERN .tmpcompile > .tmpver.2 && \
100 cmp -s .tmpver.1 .tmpver.2; then
104 mv -f .tmpcompile $TARGET
106 rm -f .tmpver.1 .tmpver.2