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Commit | Line | Data |
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17c5ca98 | 1 | #!/bin/sh |
b2441318 | 2 | # SPDX-License-Identifier: GPL-2.0 |
17c5ca98 | 3 | |
1da177e4 LT |
4 | TARGET=$1 |
5 | ARCH=$2 | |
6 | SMP=$3 | |
bd5bdd87 | 7 | PREEMPT=$4 |
4b950bb9 | 8 | PREEMPT_RT=$5 |
9a950154 | 9 | CC_VERSION="$6" |
4dcc9a88 | 10 | LD=$7 |
1da177e4 | 11 | |
1da177e4 LT |
12 | # Do not expand names |
13 | set -f | |
14 | ||
87c94bfb SR |
15 | # Fix the language to get consistent output |
16 | LC_ALL=C | |
17 | export LC_ALL | |
18 | ||
19 | if [ -z "$KBUILD_BUILD_VERSION" ]; then | |
37131ec4 | 20 | VERSION=$(cat .version 2>/dev/null || echo 1) |
1da177e4 | 21 | else |
87c94bfb | 22 | VERSION=$KBUILD_BUILD_VERSION |
1da177e4 LT |
23 | fi |
24 | ||
87c94bfb SR |
25 | if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then |
26 | TIMESTAMP=`date` | |
27 | else | |
28 | TIMESTAMP=$KBUILD_BUILD_TIMESTAMP | |
29 | fi | |
53e6892c | 30 | if test -z "$KBUILD_BUILD_USER"; then |
f0772604 | 31 | LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/') |
53e6892c MM |
32 | else |
33 | LINUX_COMPILE_BY=$KBUILD_BUILD_USER | |
34 | fi | |
35 | if test -z "$KBUILD_BUILD_HOST"; then | |
1e66d50a | 36 | LINUX_COMPILE_HOST=`uname -n` |
53e6892c MM |
37 | else |
38 | LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST | |
39 | fi | |
1da177e4 LT |
40 | |
41 | UTS_VERSION="#$VERSION" | |
bd5bdd87 SR |
42 | CONFIG_FLAGS="" |
43 | if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi | |
44 | if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi | |
4b950bb9 | 45 | if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi |
1da177e4 LT |
46 | |
47 | # Truncate to maximum length | |
1da177e4 | 48 | UTS_LEN=64 |
e8193650 | 49 | UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)" |
1da177e4 LT |
50 | |
51 | # Generate a temporary compile.h | |
52 | ||
b79c6aa6 | 53 | { echo /\* This file is auto generated, version $VERSION \*/ |
bd5bdd87 | 54 | if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi |
38385f8f | 55 | |
1da177e4 LT |
56 | echo \#define UTS_MACHINE \"$ARCH\" |
57 | ||
e8193650 | 58 | echo \#define UTS_VERSION \"$UTS_VERSION\" |
1da177e4 | 59 | |
c8f3dea9 | 60 | printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY" |
e8193650 | 61 | echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\" |
1da177e4 | 62 | |
4dcc9a88 KC |
63 | LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \ |
64 | | sed 's/[[:space:]]*$//') | |
65 | printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION" | |
b79c6aa6 | 66 | } > .tmpcompile |
1da177e4 LT |
67 | |
68 | # Only replace the real compile.h if the new one is different, | |
69 | # in order to preserve the timestamp and avoid unnecessary | |
70 | # recompilations. | |
a979522a MM |
71 | # We don't consider the file changed if only the date/time changed, |
72 | # unless KBUILD_BUILD_TIMESTAMP was explicitly set (e.g. for | |
73 | # reproducible builds with that value referring to a commit timestamp). | |
1da177e4 | 74 | # A kernel config change will increase the generation number, thus |
38385f8f | 75 | # causing compile.h to be updated (including date/time) due to the |
1da177e4 LT |
76 | # changed comment in the |
77 | # first line. | |
78 | ||
a979522a MM |
79 | if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then |
80 | IGNORE_PATTERN="UTS_VERSION" | |
81 | else | |
82 | IGNORE_PATTERN="NOT_A_PATTERN_TO_BE_MATCHED" | |
83 | fi | |
84 | ||
1da177e4 | 85 | if [ -r $TARGET ] && \ |
a979522a MM |
86 | grep -v $IGNORE_PATTERN $TARGET > .tmpver.1 && \ |
87 | grep -v $IGNORE_PATTERN .tmpcompile > .tmpver.2 && \ | |
1da177e4 LT |
88 | cmp -s .tmpver.1 .tmpver.2; then |
89 | rm -f .tmpcompile | |
90 | else | |
c39013ee | 91 | echo " UPD $TARGET" |
1da177e4 LT |
92 | mv -f .tmpcompile $TARGET |
93 | fi | |
94 | rm -f .tmpver.1 .tmpver.2 |