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