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0001 #!/bin/sh 0002 # SPDX-License-Identifier: GPL-2.0-only 0003 # 0004 # Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG 0005 # options your compiler does not support. This works well if you configure and 0006 # build the kernel on the same host machine. 0007 # 0008 # It is inconvenient if you prepare the .config that is carried to a different 0009 # build environment (typically this happens when you package the kernel for 0010 # distros) because using a different compiler potentially produces different 0011 # CONFIG options than the real build environment. So, you probably want to make 0012 # as many options visible as possible. In other words, you need to create a 0013 # super-set of CONFIG options that cover any build environment. If some of the 0014 # CONFIG options turned out to be unsupported on the build machine, they are 0015 # automatically disabled by the nature of Kconfig. 0016 # 0017 # However, it is not feasible to get a full-featured compiler for every arch. 0018 # Hence these dummy toolchains to make all compiler tests pass. 0019 # 0020 # Usage: 0021 # 0022 # From the top directory of the source tree, run 0023 # 0024 # $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig 0025 # 0026 # Most of compiler features are tested by cc-option, which simply checks the 0027 # exit code of $(CC). This script does nothing and just exits with 0 in most 0028 # cases. So, $(cc-option, ...) is evaluated as 'y'. 0029 # 0030 # This scripts caters to more checks; handle --version and pre-process __GNUC__ 0031 # etc. to pretend to be GCC, and also do right things to satisfy some scripts. 0032 0033 # Check if the first parameter appears in the rest. Succeeds if found. 0034 # This helper is useful if a particular option was passed to this script. 0035 # Typically used like this: 0036 # arg_contain <word-you-are-searching-for> "$@" 0037 arg_contain () 0038 { 0039 search="$1" 0040 shift 0041 0042 while [ $# -gt 0 ] 0043 do 0044 if [ "$search" = "$1" ]; then 0045 return 0 0046 fi 0047 shift 0048 done 0049 0050 return 1 0051 } 0052 0053 # To set CONFIG_CC_IS_GCC=y 0054 if arg_contain --version "$@"; then 0055 echo "gcc (scripts/dummy-tools/gcc)" 0056 exit 0 0057 fi 0058 0059 if arg_contain -E "$@"; then 0060 # For scripts/cc-version.sh; This emulates GCC 20.0.0 0061 if arg_contain - "$@"; then 0062 sed -n '/^GCC/{s/__GNUC__/20/; s/__GNUC_MINOR__/0/; s/__GNUC_PATCHLEVEL__/0/; p;}; s/__LONG_DOUBLE_128__/1/ p' 0063 exit 0 0064 else 0065 echo "no input files" >&2 0066 exit 1 0067 fi 0068 fi 0069 0070 # To set CONFIG_AS_IS_GNU 0071 if arg_contain -Wa,--version "$@"; then 0072 echo "GNU assembler (scripts/dummy-tools) 2.50" 0073 exit 0 0074 fi 0075 0076 if arg_contain -S "$@"; then 0077 # For scripts/gcc-x86-*-has-stack-protector.sh 0078 if arg_contain -fstack-protector "$@"; then 0079 if arg_contain -mstack-protector-guard-reg=fs "$@"; then 0080 echo "%fs" 0081 else 0082 echo "%gs" 0083 fi 0084 exit 0 0085 fi 0086 0087 # For arch/powerpc/tools/gcc-check-mprofile-kernel.sh 0088 if arg_contain -m64 "$@" && arg_contain -mlittle-endian "$@" && 0089 arg_contain -mprofile-kernel "$@"; then 0090 if ! test -t 0 && ! grep -q notrace; then 0091 echo "_mcount" 0092 fi 0093 exit 0 0094 fi 0095 fi 0096 0097 # To set GCC_PLUGINS 0098 if arg_contain -print-file-name=plugin "$@"; then 0099 # Use $0 to find the in-tree dummy directory 0100 echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir" 0101 exit 0 0102 fi 0103 0104 # inverted return value 0105 if arg_contain -D__SIZEOF_INT128__=0 "$@"; then 0106 exit 1 0107 fi
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