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Sam Ravnborg 87c94bfb8a kbuild: override build timestamp & version

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>

2007-05-02 20:58:09 +02:00

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TARGET=$1 ARCH=$2 SMP=$3 PREEMPT=$4 CC=$5

If compile.h exists already and we don't own autoconf.h

(i.e. we're not the same user who did make *config), don't

modify compile.h

So "sudo make install" won't change the "compiled by "

do "compiled by root"

if [ -r $TARGET -a ! -O include/linux/autoconf.h ]; then echo " SKIPPED $TARGET" exit 0 fi

Do not expand names

set -f

Fix the language to get consistent output

LC_ALL=C export LC_ALL

if [ -z "$KBUILD_BUILD_VERSION" ]; then if [ -r .version ]; then VERSION=cat .version else VERSION=0 echo 0 > .version fi else VERSION=$KBUILD_BUILD_VERSION fi

if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then TIMESTAMP=date else TIMESTAMP=$KBUILD_BUILD_TIMESTAMP fi

UTS_VERSION="#$VERSION" CONFIG_FLAGS="" if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"

Truncate to maximum length

UTS_LEN=64 UTS_TRUNCATE="sed -e s/.\{1,$UTS_LEN\}.*/\1/"

Generate a temporary compile.h

( echo /* This file is auto generated, version $VERSION */ if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi

echo #define UTS_MACHINE "$ARCH"

echo #define UTS_VERSION "echo $UTS_VERSION | $UTS_TRUNCATE"

echo #define LINUX_COMPILE_TIME "date +%T" echo #define LINUX_COMPILE_BY "whoami" echo #define LINUX_COMPILE_HOST "hostname | $UTS_TRUNCATE"

if [ -x /bin/dnsdomainname ]; then echo #define LINUX_COMPILE_DOMAIN "dnsdomainname | $UTS_TRUNCATE" elif [ -x /bin/domainname ]; then echo #define LINUX_COMPILE_DOMAIN "domainname | $UTS_TRUNCATE" else echo #define LINUX_COMPILE_DOMAIN fi

echo #define LINUX_COMPILER "$CC -v 2>&1 | tail -n 1" ) > .tmpcompile

Only replace the real compile.h if the new one is different,

in order to preserve the timestamp and avoid unnecessary

recompilations.

We don't consider the file changed if only the date/time changed.

A kernel config change will increase the generation number, thus

causing compile.h to be updated (including date/time) due to the

changed comment in the

first line.

if [ -r $TARGET ] &&
grep -v 'UTS_VERSION|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 &&
grep -v 'UTS_VERSION|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 &&
cmp -s .tmpver.1 .tmpver.2; then rm -f .tmpcompile else echo " UPD $TARGET" mv -f .tmpcompile $TARGET fi rm -f .tmpver.1 .tmpver.2

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