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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2022 Masahiro Yamada <masahiroy@kernel.org>
# Copyright (C) 2022 Owen Rafferty <owen@owenrafferty.com>
#
# Exit with error if a local exported symbol is found.
# EXPORT_SYMBOL should be used for global symbols.
set -e
pid=$$
# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm) shows
# 'no symbols' diagnostic (but exits with 0). It is harmless and hidden by
# '2>/dev/null'. However, it suppresses real error messages as well. Add a
# hand-crafted error message here.
#
# TODO:
# Use --quiet instead of 2>/dev/null when we upgrade the minimum version of
# binutils to 2.37, llvm to 13.0.0.
# Then, the following line will be simpler:
# { ${NM} --quiet ${1} || kill 0; } |
{ ${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; kill $pid; } } |
${AWK} -v "file=${1}" '
BEGIN {
i = 0
}
# Skip the line if the number of fields is less than 3.
#
# case 1)
# For undefined symbols, the first field (value) is empty.
# The outout looks like this:
# " U _printk"
# It is unneeded to record undefined symbols.
#
# case 2)
# For Clang LTO, llvm-nm outputs a line with type t but empty name:
# "---------------- t"
!length($3) {
next
}
# save (name, type) in the associative array
{ symbol_types[$3]=$2 }
# append the exported symbol to the array
($3 ~ /^__ksymtab_/) {
export_symbols[i] = $3
sub(/^__ksymtab_/, "", export_symbols[i])
i++
}
END {
exit_code = 0
for (j = 0; j < i; ++j) {
name = export_symbols[j]
# nm(3) says "If lowercase, the symbol is usually local"
if (symbol_types[name] ~ /[a-z]/) {
printf "%s: error: local symbol %s was exported\n",
file, name | "cat 1>&2"
exit_code = 1
}
}
exit exit_code
}'
exit $?
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