forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
1.9 KiB
71 lines
1.9 KiB
#!/usr/bin/env bash |
|
# SPDX-License-Identifier: GPL-2.0-only |
|
# |
|
# Copyright (C) 2022 Masahiro Yamada <[email protected]> |
|
# |
|
# Exit with error if a local exported symbol is found. |
|
# EXPORT_SYMBOL should be used for global symbols. |
|
|
|
set -e |
|
|
|
# catch errors from ${NM} |
|
set -o pipefail |
|
|
|
# Run the last element of a pipeline in the current shell. |
|
# Without this, the while-loop would be executed in a subshell, and |
|
# the changes made to 'symbol_types' and 'export_symbols' would be lost. |
|
shopt -s lastpipe |
|
|
|
declare -A symbol_types |
|
declare -a export_symbols |
|
|
|
exit_code=0 |
|
|
|
# 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 really simple: |
|
# ${NM} --quiet ${1} | |
|
|
|
{ ${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; false; } } | |
|
while read value type name |
|
do |
|
# 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" |
|
if [[ -z ${name} ]]; then |
|
continue |
|
fi |
|
|
|
# save (name, type) in the associative array |
|
symbol_types[${name}]=${type} |
|
|
|
# append the exported symbol to the array |
|
if [[ ${name} == __ksymtab_* ]]; then |
|
export_symbols+=(${name#__ksymtab_}) |
|
fi |
|
done |
|
|
|
for name in "${export_symbols[@]}" |
|
do |
|
# nm(3) says "If lowercase, the symbol is usually local" |
|
if [[ ${symbol_types[$name]} =~ [a-z] ]]; then |
|
echo "$@: error: local symbol '${name}' was exported" >&2 |
|
exit_code=1 |
|
fi |
|
done |
|
|
|
exit ${exit_code}
|
|
|