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# The AC_MULTILIB macro was extracted and modified from
# gettext-0.15's AC_LIB_PREPARE_MULTILIB macro in the lib-prefix.m4 file
# so that the correct paths can be used for 64-bit libraries.
dnl Copyright (C) 2001-2005 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible.
dnl AC_MULTILIB creates a variable libdirsuffix, containing
dnl the suffix of the libdir, either "" or "64".
dnl Only do this if the given enable parameter is "yes".
dnl There is no formal standard regarding lib and lib64. The current
dnl practice is that on a system supporting 32-bit and 64-bit instruction
dnl sets or ABIs, 64-bit libraries go under $prefix/lib64 and 32-bit
dnl libraries go under $prefix/lib. We determine the compiler's default
dnl mode by looking at the compiler's library search path. If at least
dnl of its elements ends in /lib64 or points to a directory whose absolute
dnl pathname ends in /lib64, we assume a 64-bit ABI. Otherwise we use the
dnl default, namely "lib".
searchpath=`(LC_ALL=C $CC -print-search-dirs) 2>/dev/null | sed -n -e 's,^libraries: ,,p' | sed -e 's,^=,,'`
if test "$enable_lib64" = "yes" -a -n "$searchpath"; then
save_IFS="${IFS= }"; IFS=":"
for searchdir in $searchpath; do
if test -d "$searchdir"; then
case "$searchdir" in
*/lib64/ | */lib64 ) libdirsuffix=64 ;;
*) searchdir=`cd "$searchdir" && pwd`
case "$searchdir" in
*/lib64 ) libdirsuffix=64 ;;
esac ;;