# Copyright (C) 2002-2021 Free Software Foundation, Inc.
#
# This file is part of GCC.
#
# GCC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# On Debian, Ubuntu and other derivative distributions, the 32bit libraries
# are found in /lib32 and /usr/lib32, /lib64 and /usr/lib64 are symlinks to
# /lib and /usr/lib, while other distributions install libraries into /lib64
# and /usr/lib64.  The LSB does not enforce the use of /lib64 and /usr/lib64,
# it doesn't tell anything about the 32bit libraries on those systems.  Set
# MULTILIB_OSDIRNAMES according to what is found on the target.

# To support i386, x86-64 and x32 libraries, the directory structrue
# should be:
#
# 	/lib has i386 libraries.
# 	/lib64 has x86-64 libraries.
# 	/libx32 has x32 libraries.
#
comma=,
MULTILIB_OPTIONS    = $(subst $(comma),/,$(TM_MULTILIB_CONFIG))
MULTILIB_DIRNAMES   = $(patsubst m%, %, $(subst /, ,$(MULTILIB_OPTIONS)))
MULTILIB_OSDIRNAMES = m64=../lib64$(call if_multiarch,:x86_64-linux-gnu)
MULTILIB_OSDIRNAMES+= m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:i386-linux-gnu)
MULTILIB_OSDIRNAMES+= mx32=../libx32$(call if_multiarch,:x86_64-linux-gnux32)