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|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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