1#!/bin/sh
  2# SPDX-License-Identifier: GPL-2.0-only
  3#
  4# Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG
  5# options your compiler does not support. This works well if you configure and
  6# build the kernel on the same host machine.
  7#
  8# It is inconvenient if you prepare the .config that is carried to a different
  9# build environment (typically this happens when you package the kernel for
 10# distros) because using a different compiler potentially produces different
 11# CONFIG options than the real build environment. So, you probably want to make
 12# as many options visible as possible. In other words, you need to create a
 13# super-set of CONFIG options that cover any build environment. If some of the
 14# CONFIG options turned out to be unsupported on the build machine, they are
 15# automatically disabled by the nature of Kconfig.
 16#
 17# However, it is not feasible to get a full-featured compiler for every arch.
 18# Hence these dummy toolchains to make all compiler tests pass.
 19#
 20# Usage:
 21#
 22# From the top directory of the source tree, run
 23#
 24#   $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig
 25#
 26# Most of compiler features are tested by cc-option, which simply checks the
 27# exit code of $(CC). This script does nothing and just exits with 0 in most
 28# cases. So, $(cc-option, ...) is evaluated as 'y'.
 29#
 30# This scripts caters to more checks; handle --version and pre-process __GNUC__
 31# etc. to pretend to be GCC, and also do right things to satisfy some scripts.
 32
 33# Check if the first parameter appears in the rest. Succeeds if found.
 34# This helper is useful if a particular option was passed to this script.
 35# Typically used like this:
 36#   arg_contain <word-you-are-searching-for> "$@"
 37arg_contain ()
 38{
 39	search="$1"
 40	shift
 41
 42	while [ $# -gt 0 ]
 43	do
 44		if [ "$search" = "$1" ]; then
 45			return 0
 46		fi
 47		shift
 48	done
 49
 50	return 1
 51}
 52
 53# To set CONFIG_CC_IS_GCC=y
 54if arg_contain --version "$@"; then
 55	echo "gcc (scripts/dummy-tools/gcc)"
 56	exit 0
 57fi
 58
 59if arg_contain -E "$@"; then
 60	# For scripts/cc-version.sh; This emulates GCC 20.0.0
 61	if arg_contain - "$@"; then
 62		sed -n '/^GCC/{s/__GNUC__/20/; s/__GNUC_MINOR__/0/; s/__GNUC_PATCHLEVEL__/0/; p;}; s/__LONG_DOUBLE_128__/1/ p'
 63		exit 0
 64	else
 65		echo "no input files" >&2
 66		exit 1
 67	fi
 68fi
 69
 70# To set CONFIG_AS_IS_GNU
 71if arg_contain -Wa,--version "$@"; then
 72	echo "GNU assembler (scripts/dummy-tools) 2.50"
 73	exit 0
 74fi
 75
 76if arg_contain -S "$@"; then
 77	# For scripts/gcc-x86-*-has-stack-protector.sh
 78	if arg_contain -fstack-protector "$@"; then
 79		if arg_contain -mstack-protector-guard-reg=fs "$@"; then
 80			echo "%fs"
 81		else
 82			echo "%gs"
 83		fi
 84		exit 0
 85	fi
 86
 87	# For arch/powerpc/tools/gcc-check-mprofile-kernel.sh
 88	if arg_contain -m64 "$@" && arg_contain -mlittle-endian "$@" &&
 89		arg_contain -mprofile-kernel "$@"; then
 90		if ! test -t 0 && ! grep -q notrace; then
 91			echo "_mcount"
 92		fi
 93		exit 0
 94	fi
 95fi
 96
 97# To set GCC_PLUGINS
 98if arg_contain -print-file-name=plugin "$@"; then
 99	# Use $0 to find the in-tree dummy directory
100	echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir"
101	exit 0
102fi
103
104# inverted return value
105if arg_contain -D__SIZEOF_INT128__=0 "$@"; then
106	exit 1
 
 
 
 
 
 
107fi

 1#!/bin/sh
 2# SPDX-License-Identifier: GPL-2.0-only
 3#
 4# Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG
 5# options your compiler does not support. This works well if you configure and
 6# build the kernel on the same host machine.
 7#
 8# It is inconvenient if you prepare the .config that is carried to a different
 9# build environment (typically this happens when you package the kernel for
10# distros) because using a different compiler potentially produces different
11# CONFIG options than the real build environment. So, you probably want to make
12# as many options visible as possible. In other words, you need to create a
13# super-set of CONFIG options that cover any build environment. If some of the
14# CONFIG options turned out to be unsupported on the build machine, they are
15# automatically disabled by the nature of Kconfig.
16#
17# However, it is not feasible to get a full-featured compiler for every arch.
18# Hence these dummy toolchains to make all compiler tests pass.
19#
20# Usage:
21#
22# From the top directory of the source tree, run
23#
24#   $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig
25#
26# Most of compiler features are tested by cc-option, which simply checks the
27# exit code of $(CC). This script does nothing and just exits with 0 in most
28# cases. So, $(cc-option, ...) is evaluated as 'y'.
29#
30# This scripts caters to more checks; handle --version and pre-process __GNUC__
31# etc. to pretend to be GCC, and also do right things to satisfy some scripts.
32
33# Check if the first parameter appears in the rest. Succeeds if found.
34# This helper is useful if a particular option was passed to this script.
35# Typically used like this:
36#   arg_contain <word-you-are-searching-for> "$@"
37arg_contain ()
38{
39	search="$1"
40	shift
41
42	while [ $# -gt 0 ]
43	do
44		if [ "$search" = "$1" ]; then
45			return 0
46		fi
47		shift
48	done
49
50	return 1
51}
52
53# To set CONFIG_CC_IS_GCC=y
54if arg_contain --version "$@"; then
55	echo "gcc (scripts/dummy-tools/gcc)"
56	exit 0
57fi
58
59if arg_contain -E "$@"; then
60	# For scripts/gcc-version.sh; This emulates GCC 20.0.0
61	if arg_contain - "$@"; then
62		sed 's/^__GNUC__$/20/; s/^__GNUC_MINOR__$/0/; s/^__GNUC_PATCHLEVEL__$/0/'
63		exit 0
64	else
65		echo "no input files" >&2
66		exit 1
67	fi
68fi
69
 
 
 
 
 
 
70if arg_contain -S "$@"; then
71	# For scripts/gcc-x86-*-has-stack-protector.sh
72	if arg_contain -fstack-protector "$@"; then
73		echo "%gs"
 
 
 
 
 
 
 
 
 
 
 
 
 
74		exit 0
75	fi
76fi
77
78# For scripts/gcc-plugin.sh
79if arg_contain -print-file-name=plugin "$@"; then
80	plugin_dir=$(mktemp -d)
 
 
 
81
82	sed -n 's/.*#include "\(.*\)"/\1/p' $(dirname $0)/../gcc-plugins/gcc-common.h |
83	while read header
84	do
85		mkdir -p $plugin_dir/include/$(dirname $header)
86		touch $plugin_dir/include/$header
87	done
88
89	echo $plugin_dir
90	exit 0
91fi