#! /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'

	'AS_WRUSS' # x86_32

	'BUILTIN_RETURN_ADDRESS_STRIPS_PAC'

	'CC_CAN_[A-Z_]*'

	'CC_HAS_[A-Z_]*'

	'CC_HAVE_[A-Z_]*'

	'CC_VERSION_TEXT'

	'DYNAMIC_SIGFRAME'

	'FTRACE_MCOUNT_USE_[A-Z_]*'

	'GCC_ASM_GOTO_OUTPUT_WORKAROUND'

	'GCC_VERSION'

	'G*CC[0-9]*_NO_[A-Z_]*'

	'HAVE_[A-Z]*_COMPILER'

	'HAVE_SHADOW_CALL_STACK'

	'LD_VERSION'

	'OBJTOOL'

	'PAHOLE_HAS_[A-Z0-9_]*'

	'PAHOLE_VERSION'

	'RISCV_ISA_[A-Z_]*'

	'TOOLCHAIN_HAS_[A-Z_]*'

	'TOOLCHAIN_NEEDS_[A-Z_]*'

	'TOOLS_SUPPORT_[A-Z_]*'

)

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