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b4d1ab42b8
Thread-local variables are put in the tdata section on AIX / XCOFF [1]. Unfortunately the ExportImportList script currently doesn't consider this section when looking for symbols to export. This results in linking failures in applications (such as LLVM) when building which expect these thread local variables to be exported from their shared libraries. [1]: https://www.ibm.com/docs/en/aix/7.3?topic=formats-xcoff-object-file-format
83 lines
2.5 KiB
Bash
Executable File
83 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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# This script is internal to CMake and meant only to be
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# invoked by CMake-generated build systems on AIX.
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usage='usage: ExportImportList -o <out-file> -c <compiler> [-l <lib>] [-n] [--] <objects>...'
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die() {
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echo "$@" 1>&2; exit 1
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}
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# Process command-line arguments.
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out=''
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lib=''
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no_objects=''
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compiler=''
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while test "$#" != 0; do
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case "$1" in
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-l) shift; lib="$1" ;;
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-o) shift; out="$1" ;;
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-n) no_objects='1' ;;
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-c) shift; compiler="$1" ;;
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--) shift; break ;;
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-*) die "$usage" ;;
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*) break ;;
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esac
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shift
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done
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test -n "$out" || die "$usage"
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# We need the compiler executable to resolve where the ibm-llvm-nm executable is
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test -n "$compiler" || die "$usage"
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# Build a temporary file that atomically replaces the output later.
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out_tmp="$out.tmp$$"
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trap 'rm -f "$out_tmp"' EXIT INT TERM
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> "$out_tmp"
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# If IPA was enabled and a compiler from the IBMClang family is used, then
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# the object files contain LLVM bitcode[0] rather than XCOFF objects and so
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# need to be handled differently.
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#
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# [0]: https://www.ibm.com/docs/en/openxl-c-and-cpp-aix/17.1.0?topic=compatibility-link-time-optimization-lto
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NM="$(dirname "$compiler")/../libexec/ibm-llvm-nm"
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function IsBitcode {
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# N4 = first 4 bytes, -tx = output in hexadecimal, -An = don't display offset
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# cut: trim off the preceding whitespace where the offset would be
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# 4243code is the hexadecimal magic number for LLVM bitcode
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[ "$(od -N4 -tx -An $1 | cut -d ' ' -f 2)" == "4243c0de" ];
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}
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# Collect symbols exported from all object files.
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if test -z "$no_objects"; then
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for f in "$@"; do
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if IsBitcode "$f"; then
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"$NM" "$f" --defined-only --extern-only --just-symbol-name 2>/dev/null
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else
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dump -tov -X 32_64 "$f" |
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awk '
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BEGIN {
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V["EXPORTED"]=" export"
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V["PROTECTED"]=" protected"
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}
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/^\[[0-9]+\]\tm +[^ ]+ +\.(text|data|tdata|bss) +[^ ]+ +(extern|weak) +(EXPORTED|PROTECTED| ) / {
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if (!match($NF,/^(\.|__sinit|__sterm|__[0-9]+__)/)) {
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print $NF V[$(NF-1)]
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}
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}
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'
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fi
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done >> "$out_tmp"
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fi
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# Generate the export/import file.
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{
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if test -n "$lib"; then
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echo "#! $lib"
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fi
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sort -u "$out_tmp"
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} > "$out"
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