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70 lines
1.7 KiB
70 lines
1.7 KiB
#!/bin/sh |
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# SPDX-License-Identifier: GPL-2.0-only |
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# |
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# Copyright (C) 2022 Masahiro Yamada <[email protected]> |
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# Copyright (C) 2022 Owen Rafferty <[email protected]> |
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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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pid=$$ |
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# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm) shows |
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# 'no symbols' diagnostic (but exits with 0). It is harmless and hidden by |
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# '2>/dev/null'. However, it suppresses real error messages as well. Add a |
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# hand-crafted error message here. |
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# |
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# TODO: |
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# Use --quiet instead of 2>/dev/null when we upgrade the minimum version of |
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# binutils to 2.37, llvm to 13.0.0. |
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# Then, the following line will be simpler: |
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# { ${NM} --quiet ${1} || kill 0; } | |
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{ ${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; kill $pid; } } | |
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${AWK} -v "file=${1}" ' |
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BEGIN { |
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i = 0 |
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} |
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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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!length($3) { |
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next |
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} |
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# save (name, type) in the associative array |
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{ symbol_types[$3]=$2 } |
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# append the exported symbol to the array |
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($3 ~ /^__ksymtab_/) { |
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export_symbols[i] = $3 |
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sub(/^__ksymtab_/, "", export_symbols[i]) |
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i++ |
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} |
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END { |
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exit_code = 0 |
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for (j = 0; j < i; ++j) { |
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name = export_symbols[j] |
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# nm(3) says "If lowercase, the symbol is usually local" |
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if (symbol_types[name] ~ /[a-z]/) { |
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printf "%s: error: local symbol %s was exported\n", |
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file, name | "cat 1>&2" |
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exit_code = 1 |
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} |
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} |
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exit exit_code |
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}' |
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exit $?
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