mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
c8f3dea90e
Commit858805b336("kbuild: add $(BASH) to run scripts with bash-extension") shed light on portability issues. Here is another one. Since commitf07726048d("Fix handling of backlash character in LINUX_COMPILE_BY name"), we must escape a backslash contained in LINUX_COMPILE_BY. This is not working on such distros as Ubuntu. As the POSIX spec [1] says, if any of the operands contain a backslash ( '\' ) character, the results are implementation-defined. The actual shell of /bin/sh could be bash, dash, etc. depending on distros, and the behavior of builtin echo command is different among them. The bash builtin echo, unless -e is given, copies the arguments to stdout without expanding escape sequences (BSD-like behavior). The dash builtin echo, in contrast, adopts System V behavior, which does expand escape sequences without any option given. Even non-builtin /bin/echo behaves differently depending on the system. Due to these variations, echo is considered as a non-portable command. Using printf is the common solution to avoid the portability issue. [1] https://pubs.opengroup.org/onlinepubs/009695399/utilities/echo.html Fixes:858805b336("kbuild: add $(BASH) to run scripts with bash-extension") Reported-by: XXing Wei <xxing.wei@unisoc.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
97 lines
2.5 KiB
Bash
Executable File
97 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
TARGET=$1
|
|
ARCH=$2
|
|
SMP=$3
|
|
PREEMPT=$4
|
|
PREEMPT_RT=$5
|
|
CC=$6
|
|
|
|
vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
|
|
|
|
# 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 <user>"
|
|
# do "compiled by root"
|
|
|
|
if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
|
|
vecho " 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
|
|
VERSION=$(cat .version 2>/dev/null || echo 1)
|
|
else
|
|
VERSION=$KBUILD_BUILD_VERSION
|
|
fi
|
|
|
|
if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
|
|
TIMESTAMP=`date`
|
|
else
|
|
TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
|
|
fi
|
|
if test -z "$KBUILD_BUILD_USER"; then
|
|
LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
|
|
else
|
|
LINUX_COMPILE_BY=$KBUILD_BUILD_USER
|
|
fi
|
|
if test -z "$KBUILD_BUILD_HOST"; then
|
|
LINUX_COMPILE_HOST=`hostname`
|
|
else
|
|
LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
|
|
fi
|
|
|
|
UTS_VERSION="#$VERSION"
|
|
CONFIG_FLAGS=""
|
|
if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
|
|
if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
|
|
if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
|
|
|
|
# Truncate to maximum length
|
|
UTS_LEN=64
|
|
UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)"
|
|
|
|
# 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 \"$UTS_VERSION\"
|
|
|
|
printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
|
|
echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
|
|
|
|
echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
|
|
} > .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' $TARGET > .tmpver.1 && \
|
|
grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
|
|
cmp -s .tmpver.1 .tmpver.2; then
|
|
rm -f .tmpcompile
|
|
else
|
|
vecho " UPD $TARGET"
|
|
mv -f .tmpcompile $TARGET
|
|
fi
|
|
rm -f .tmpver.1 .tmpver.2
|