mirror of https://github.com/bazelbuild/rules_cc
45 lines
1.8 KiB
Smarty
Executable File
45 lines
1.8 KiB
Smarty
Executable File
#!/usr/bin/env bash
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#
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# Copyright 2023 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -euo pipefail
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# Find all duplicate symbols in the given static library:
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# 1. Use nm to list all global symbols in the library in POSIX format:
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# libstatic.a[my_object.o]: my_function T 1234 abcd
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# 2. Use sed to transform the output to a format that can be sorted by symbol
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# name and is readable by humans:
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# my_object.o: T my_function
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# By using the `t` and `d` commands, lines for symbols of type U (undefined)
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# as well as V and W (weak) and their local lowercase variants are removed.
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# 3. Use sort to sort the lines by symbol name.
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# 4. Use uniq to only keep the lines corresponding to duplicate symbols.
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# 5. Use c++filt to demangle the symbol names.
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# c++filt is applied to the duplicated symbols instead of using the -C flag
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# of nm because it is not in POSIX and demangled names may not be unique
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# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35201).
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DUPLICATE_SYMBOLS=$(
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"%{nm}" -A -g -P %{nm_extra_args} "$1" |
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sed -E -e 's/.*\[([^][]+)\]: (.+) ([A-TX-Z]) [a-f0-9]+ [a-f0-9]+/\1: \3 \2/g' -e t -e d |
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LC_ALL=C sort -k 3 |
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LC_ALL=C uniq -D -f 2 |
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"%{c++filt}")
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if [[ -n "$DUPLICATE_SYMBOLS" ]]; then
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>&2 echo "Duplicate symbols found in $1:"
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>&2 echo "$DUPLICATE_SYMBOLS"
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exit 1
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else
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touch "$2"
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fi
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