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Felipe Contreras17c5ca92009-09-17 00:38:40 +03001#!/bin/sh
2
Linus Torvalds1da177e2005-04-16 15:20:36 -07003TARGET=$1
4ARCH=$2
5SMP=$3
Sam Ravnborgbd5bdd82005-07-14 20:18:07 +00006PREEMPT=$4
7CC=$5
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
Mike Frysingerd03fab42008-11-06 03:31:22 -05009vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011# If compile.h exists already and we don't own autoconf.h
12# (i.e. we're not the same user who did make *config), don't
13# modify compile.h
14# So "sudo make install" won't change the "compiled by <user>"
15# do "compiled by root"
16
Sam Ravnborg264a2682009-10-18 00:49:24 +020017if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
Mike Frysingerd03fab42008-11-06 03:31:22 -050018 vecho " SKIPPED $TARGET"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 exit 0
20fi
21
22# Do not expand names
23set -f
24
Sam Ravnborg87c94bf2007-04-01 21:49:27 +020025# Fix the language to get consistent output
26LC_ALL=C
27export LC_ALL
28
29if [ -z "$KBUILD_BUILD_VERSION" ]; then
30 if [ -r .version ]; then
31 VERSION=`cat .version`
32 else
33 VERSION=0
34 echo 0 > .version
35 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -070036else
Sam Ravnborg87c94bf2007-04-01 21:49:27 +020037 VERSION=$KBUILD_BUILD_VERSION
Linus Torvalds1da177e2005-04-16 15:20:36 -070038fi
39
Sam Ravnborg87c94bf2007-04-01 21:49:27 +020040if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
41 TIMESTAMP=`date`
42else
43 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
44fi
Michal Marek53e68922011-04-05 14:32:30 +020045if test -z "$KBUILD_BUILD_USER"; then
Marcin Nowakowskif0772602011-04-25 13:35:21 +010046 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
Michal Marek53e68922011-04-05 14:32:30 +020047else
48 LINUX_COMPILE_BY=$KBUILD_BUILD_USER
49fi
50if test -z "$KBUILD_BUILD_HOST"; then
51 LINUX_COMPILE_HOST=`hostname`
52else
53 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
54fi
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56UTS_VERSION="#$VERSION"
Sam Ravnborgbd5bdd82005-07-14 20:18:07 +000057CONFIG_FLAGS=""
58if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
59if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
Sam Ravnborg87c94bf2007-04-01 21:49:27 +020060UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62# Truncate to maximum length
63
64UTS_LEN=64
Felipe Contreras17c5ca92009-09-17 00:38:40 +030065UTS_TRUNCATE="cut -b -$UTS_LEN"
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67# Generate a temporary compile.h
68
69( echo /\* This file is auto generated, version $VERSION \*/
Sam Ravnborgbd5bdd82005-07-14 20:18:07 +000070 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
Masahiro Yamada38385f82014-04-28 16:26:18 +090071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 echo \#define UTS_MACHINE \"$ARCH\"
73
74 echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
75
Michal Marek53e68922011-04-05 14:32:30 +020076 echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
77 echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Jan-Simon Möllerdb462932012-11-14 10:55:48 +010079 echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version '`\"
Linus Torvalds1da177e2005-04-16 15:20:36 -070080) > .tmpcompile
81
82# Only replace the real compile.h if the new one is different,
83# in order to preserve the timestamp and avoid unnecessary
84# recompilations.
Matthias Maennichf6d49f62021-06-12 15:18:38 +010085# We don't consider the file changed if only the date/time changed,
86# unless KBUILD_BUILD_TIMESTAMP was explicitly set (e.g. for
87# reproducible builds with that value referring to a commit timestamp).
Linus Torvalds1da177e2005-04-16 15:20:36 -070088# A kernel config change will increase the generation number, thus
Masahiro Yamada38385f82014-04-28 16:26:18 +090089# causing compile.h to be updated (including date/time) due to the
Linus Torvalds1da177e2005-04-16 15:20:36 -070090# changed comment in the
91# first line.
92
Matthias Maennichf6d49f62021-06-12 15:18:38 +010093if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
94 IGNORE_PATTERN="UTS_VERSION"
95else
96 IGNORE_PATTERN="NOT_A_PATTERN_TO_BE_MATCHED"
97fi
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099if [ -r $TARGET ] && \
Matthias Maennichf6d49f62021-06-12 15:18:38 +0100100 grep -v $IGNORE_PATTERN $TARGET > .tmpver.1 && \
101 grep -v $IGNORE_PATTERN .tmpcompile > .tmpver.2 && \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 cmp -s .tmpver.1 .tmpver.2; then
103 rm -f .tmpcompile
104else
Mike Frysingerd03fab42008-11-06 03:31:22 -0500105 vecho " UPD $TARGET"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 mv -f .tmpcompile $TARGET
107fi
108rm -f .tmpver.1 .tmpver.2