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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117#!/bin/sh# SPDX-License-Identifier: GPL-2.0-only## Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG# options your compiler does not support. This works well if you configure and# build the kernel on the same host machine.## It is inconvenient if you prepare the .config that is carried to a different# build environment (typically this happens when you package the kernel for# distros) because using a different compiler potentially produces different# CONFIG options than the real build environment. So, you probably want to make# as many options visible as possible. In other words, you need to create a# super-set of CONFIG options that cover any build environment. If some of the# CONFIG options turned out to be unsupported on the build machine, they are# automatically disabled by the nature of Kconfig.## However, it is not feasible to get a full-featured compiler for every arch.# Hence these dummy toolchains to make all compiler tests pass.## Usage:## From the top directory of the source tree, run## $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig## Most of compiler features are tested by cc-option, which simply checks the# exit code of $(CC). This script does nothing and just exits with 0 in most# cases. So, $(cc-option, ...) is evaluated as 'y'.## This scripts caters to more checks; handle --version and pre-process __GNUC__# etc. to pretend to be GCC, and also do right things to satisfy some scripts.
# Check if the first parameter appears in the rest. Succeeds if found.# This helper is useful if a particular option was passed to this script.# Typically used like this:# arg_contain <word-you-are-searching-for> "$@"arg_contain (){ search="$1" shift
while [ $# -gt 0 ] do if [ "$search" = "$1" ]; then return 0 fi shift done
return 1}
# To set CONFIG_CC_IS_GCC=yif arg_contain --version "$@"; then echo "gcc (scripts/dummy-tools/gcc)" exit 0fi
if arg_contain -E "$@"; then # For scripts/cc-version.sh; This emulates GCC 20.0.0 if arg_contain - "$@"; then sed -n '/^GCC/{s/__GNUC__/20/; s/__GNUC_MINOR__/0/; s/__GNUC_PATCHLEVEL__/0/; p;}; s/__LONG_DOUBLE_128__/1/ p' exit 0 else echo "no input files" >&2 exit 1 fifi
# To set CONFIG_AS_IS_GNUif arg_contain -Wa,--version "$@"; then echo "GNU assembler (scripts/dummy-tools) 2.50" exit 0fi
if arg_contain -S "$@"; then # For scripts/gcc-x86-*-has-stack-protector.sh if arg_contain -fstack-protector "$@"; then if arg_contain -mstack-protector-guard-reg=fs "$@"; then echo "%fs" else echo "%gs" fi exit 0 fi
# For arch/powerpc/tools/gcc-check-mprofile-kernel.sh if arg_contain -m64 "$@" && arg_contain -mprofile-kernel "$@"; then if ! test -t 0 && ! grep -q notrace; then echo "_mcount" fi exit 0 fi
# For arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh if arg_contain -m64 "$@" && arg_contain -fpatchable-function-entry=2 "$@"; then echo "func:" echo ".section __patchable_function_entries" echo ".localentry" echo " nop" echo " nop" exit 0 fifi
# To set GCC_PLUGINSif arg_contain -print-file-name=plugin "$@"; then # Use $0 to find the in-tree dummy directory echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir" exit 0fi
# inverted return valueif arg_contain -D__SIZEOF_INT128__=0 "$@"; then exit 1fi