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101 lines
2.8 KiB
101 lines
2.8 KiB
#!/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;}' |
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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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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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echo "%gs" |
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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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plugin_dir=$(mktemp -d) |
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mkdir -p $plugin_dir/include |
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touch $plugin_dir/include/plugin-version.h |
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echo $plugin_dir |
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exit 0 |
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fi |
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# inverted return value |
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if arg_contain -D__SIZEOF_INT128__=0 "$@"; then |
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exit 1 |
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fi
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