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