87c94bfb8a
Introduce KBUILD_BUILD_VERSION to make it possible to override kernel build version during build time. Introduce KBUILD_BUILD_TIMESTAMP to make it possible to override kernel build timestamp during build time. But variables are useful mainly by distros that want to pass info from an SCM when building the kernel. Timestamp could be last checkin date for a file etc. The idea came from Olaf Hering <olaf@aepfle.de> Cc: Olaf Hering <olaf@aepfle.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
96 lines
2.5 KiB
Plaintext
Executable file
96 lines
2.5 KiB
Plaintext
Executable file
TARGET=$1
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ARCH=$2
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SMP=$3
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PREEMPT=$4
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CC=$5
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# If compile.h exists already and we don't own autoconf.h
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# (i.e. we're not the same user who did make *config), don't
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# modify compile.h
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# So "sudo make install" won't change the "compiled by <user>"
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# do "compiled by root"
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if [ -r $TARGET -a ! -O include/linux/autoconf.h ]; then
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echo " SKIPPED $TARGET"
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exit 0
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fi
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# Do not expand names
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set -f
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# Fix the language to get consistent output
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LC_ALL=C
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export LC_ALL
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if [ -z "$KBUILD_BUILD_VERSION" ]; then
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if [ -r .version ]; then
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VERSION=`cat .version`
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else
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VERSION=0
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echo 0 > .version
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fi
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else
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VERSION=$KBUILD_BUILD_VERSION
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fi
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if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
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TIMESTAMP=`date`
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else
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TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
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fi
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UTS_VERSION="#$VERSION"
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CONFIG_FLAGS=""
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if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
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if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
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UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
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# Truncate to maximum length
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UTS_LEN=64
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UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
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# Generate a temporary compile.h
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( echo /\* This file is auto generated, version $VERSION \*/
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if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
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echo \#define UTS_MACHINE \"$ARCH\"
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echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
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echo \#define LINUX_COMPILE_TIME \"`date +%T`\"
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echo \#define LINUX_COMPILE_BY \"`whoami`\"
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echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
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if [ -x /bin/dnsdomainname ]; then
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echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
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elif [ -x /bin/domainname ]; then
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echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
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else
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echo \#define LINUX_COMPILE_DOMAIN
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fi
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echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
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) > .tmpcompile
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# Only replace the real compile.h if the new one is different,
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# in order to preserve the timestamp and avoid unnecessary
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# recompilations.
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# We don't consider the file changed if only the date/time changed.
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# A kernel config change will increase the generation number, thus
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# causing compile.h to be updated (including date/time) due to the
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# changed comment in the
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# first line.
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if [ -r $TARGET ] && \
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grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
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grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
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cmp -s .tmpver.1 .tmpver.2; then
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rm -f .tmpcompile
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else
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echo " UPD $TARGET"
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mv -f .tmpcompile $TARGET
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fi
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rm -f .tmpver.1 .tmpver.2
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