1*4882a593Smuzhiyun#!/bin/sh 2*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0-only 3*4882a593Smuzhiyun# 4*4882a593Smuzhiyun# Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG 5*4882a593Smuzhiyun# options your compiler does not support. This works well if you configure and 6*4882a593Smuzhiyun# build the kernel on the same host machine. 7*4882a593Smuzhiyun# 8*4882a593Smuzhiyun# It is inconvenient if you prepare the .config that is carried to a different 9*4882a593Smuzhiyun# build environment (typically this happens when you package the kernel for 10*4882a593Smuzhiyun# distros) because using a different compiler potentially produces different 11*4882a593Smuzhiyun# CONFIG options than the real build environment. So, you probably want to make 12*4882a593Smuzhiyun# as many options visible as possible. In other words, you need to create a 13*4882a593Smuzhiyun# super-set of CONFIG options that cover any build environment. If some of the 14*4882a593Smuzhiyun# CONFIG options turned out to be unsupported on the build machine, they are 15*4882a593Smuzhiyun# automatically disabled by the nature of Kconfig. 16*4882a593Smuzhiyun# 17*4882a593Smuzhiyun# However, it is not feasible to get a full-featured compiler for every arch. 18*4882a593Smuzhiyun# Hence these dummy toolchains to make all compiler tests pass. 19*4882a593Smuzhiyun# 20*4882a593Smuzhiyun# Usage: 21*4882a593Smuzhiyun# 22*4882a593Smuzhiyun# From the top directory of the source tree, run 23*4882a593Smuzhiyun# 24*4882a593Smuzhiyun# $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig 25*4882a593Smuzhiyun# 26*4882a593Smuzhiyun# Most of compiler features are tested by cc-option, which simply checks the 27*4882a593Smuzhiyun# exit code of $(CC). This script does nothing and just exits with 0 in most 28*4882a593Smuzhiyun# cases. So, $(cc-option, ...) is evaluated as 'y'. 29*4882a593Smuzhiyun# 30*4882a593Smuzhiyun# This scripts caters to more checks; handle --version and pre-process __GNUC__ 31*4882a593Smuzhiyun# etc. to pretend to be GCC, and also do right things to satisfy some scripts. 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun# Check if the first parameter appears in the rest. Succeeds if found. 34*4882a593Smuzhiyun# This helper is useful if a particular option was passed to this script. 35*4882a593Smuzhiyun# Typically used like this: 36*4882a593Smuzhiyun# arg_contain <word-you-are-searching-for> "$@" 37*4882a593Smuzhiyunarg_contain () 38*4882a593Smuzhiyun{ 39*4882a593Smuzhiyun search="$1" 40*4882a593Smuzhiyun shift 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun while [ $# -gt 0 ] 43*4882a593Smuzhiyun do 44*4882a593Smuzhiyun if [ "$search" = "$1" ]; then 45*4882a593Smuzhiyun return 0 46*4882a593Smuzhiyun fi 47*4882a593Smuzhiyun shift 48*4882a593Smuzhiyun done 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun return 1 51*4882a593Smuzhiyun} 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun# To set CONFIG_CC_IS_GCC=y 54*4882a593Smuzhiyunif arg_contain --version "$@"; then 55*4882a593Smuzhiyun echo "gcc (scripts/dummy-tools/gcc)" 56*4882a593Smuzhiyun exit 0 57*4882a593Smuzhiyunfi 58*4882a593Smuzhiyun 59*4882a593Smuzhiyunif arg_contain -E "$@"; then 60*4882a593Smuzhiyun # For scripts/gcc-version.sh; This emulates GCC 20.0.0 61*4882a593Smuzhiyun if arg_contain - "$@"; then 62*4882a593Smuzhiyun sed 's/^__GNUC__$/20/; s/^__GNUC_MINOR__$/0/; s/^__GNUC_PATCHLEVEL__$/0/' 63*4882a593Smuzhiyun exit 0 64*4882a593Smuzhiyun else 65*4882a593Smuzhiyun echo "no input files" >&2 66*4882a593Smuzhiyun exit 1 67*4882a593Smuzhiyun fi 68*4882a593Smuzhiyunfi 69*4882a593Smuzhiyun 70*4882a593Smuzhiyunif arg_contain -S "$@"; then 71*4882a593Smuzhiyun # For scripts/gcc-x86-*-has-stack-protector.sh 72*4882a593Smuzhiyun if arg_contain -fstack-protector "$@"; then 73*4882a593Smuzhiyun echo "%gs" 74*4882a593Smuzhiyun exit 0 75*4882a593Smuzhiyun fi 76*4882a593Smuzhiyunfi 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun# To set GCC_PLUGINS 79*4882a593Smuzhiyunif arg_contain -print-file-name=plugin "$@"; then 80*4882a593Smuzhiyun # Use $0 to find the in-tree dummy directory 81*4882a593Smuzhiyun echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir" 82*4882a593Smuzhiyun exit 0 83*4882a593Smuzhiyunfi 84*4882a593Smuzhiyun 85*4882a593Smuzhiyun# inverted return value 86*4882a593Smuzhiyunif arg_contain -D__SIZEOF_INT128__=0 "$@"; then 87*4882a593Smuzhiyun exit 1 88*4882a593Smuzhiyunfi 89