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