kernel-source/check-for-config-changes

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#! /bin/bash
# This is a list of toolchain-dependent configs. That is: only those which
# change .config when gcc, ld, or similar changes.
#
# please keep them sorted alphabetically
declare -a IGNORED_CONFIGS_RE=(
'AS_HAS_[A-Z0-9_]*'
'AS_VERSION'
'CC_CAN_[A-Z_]*'
'CC_HAS_[A-Z_]*'
'CC_HAVE_[A-Z_]*'
'CC_VERSION_TEXT'
'FTRACE_MCOUNT_USE_[A-Z_]*'
'GCC_VERSION'
'G*CC[0-9]*_NO_[A-Z_]*'
'HAVE_[A-Z]*_COMPILER'
'LD_VERSION'
'PAHOLE_VERSION'
'TOOLCHAIN_HAS_[A-Z_]*'
'TOOLS_SUPPORT_[A-Z_]*'
'OBJTOOL'
)
declare -a SED_ARGS=()
for CONFIG in "${IGNORED_CONFIGS_RE[@]}"; do
SED_ARGS+=(-e "/\\<CONFIG_$CONFIG\\>/ d")
done
SED_ARGS+=(
-e '/^# .* is not set$/p'
-e '/^$\|^#/d'
)
differences="$(
diff -bU0 <(sed "${SED_ARGS[@]}" "$1" | sort) \
<(sed "${SED_ARGS[@]}" "$2" | sort) \
| grep '^[-+][^-+]'
)" || true
if [ -n "$differences" ]; then
echo
echo "Changes after running \`make oldconfig':"
echo "$differences"
echo
if echo "$differences" | grep -q '^+' ; then
exit 1
fi
fi