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42ce60aa5a
This fixes the build error when the system has a default bash version which is too old to support associative array variables. The build error log as fellowing: linux/scripts/check-local-export: line 11: declare: -A: invalid option declare: usage: declare [-afFirtx] [-p] [name[=value] ...] Signed-off-by: Schspa Shi <schspa@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
66 lines
1.8 KiB
Bash
Executable File
66 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# Copyright (C) 2022 Masahiro Yamada <masahiroy@kernel.org>
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#
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# Exit with error if a local exported symbol is found.
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# EXPORT_SYMBOL should be used for global symbols.
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set -e
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declare -A symbol_types
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declare -a export_symbols
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exit_code=0
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while read value type name
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do
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# Skip the line if the number of fields is less than 3.
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#
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# case 1)
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# For undefined symbols, the first field (value) is empty.
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# The outout looks like this:
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# " U _printk"
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# It is unneeded to record undefined symbols.
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#
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# case 2)
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# For Clang LTO, llvm-nm outputs a line with type 't' but empty name:
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# "---------------- t"
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if [[ -z ${name} ]]; then
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continue
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fi
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# save (name, type) in the associative array
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symbol_types[${name}]=${type}
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# append the exported symbol to the array
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if [[ ${name} == __ksymtab_* ]]; then
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export_symbols+=(${name#__ksymtab_})
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fi
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# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm)
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# shows 'no symbols' diagnostic (but exits with 0). It is harmless and
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# hidden by '2>/dev/null'. However, it suppresses real error messages
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# as well. Add a hand-crafted error message here.
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#
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# Use --quiet instead of 2>/dev/null when we upgrade the minimum version
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# of binutils to 2.37, llvm to 13.0.0.
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#
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# Then, the following line will be really simple:
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# done < <(${NM} --quiet ${1})
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done < <(${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; false; } )
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# Catch error in the process substitution
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wait $!
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for name in "${export_symbols[@]}"
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do
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# nm(3) says "If lowercase, the symbol is usually local"
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if [[ ${symbol_types[$name]} =~ [a-z] ]]; then
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echo "$@: error: local symbol '${name}' was exported" >&2
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exit_code=1
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fi
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done
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exit ${exit_code}
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