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      1 # Copyright (C) 2002-2022 Free Software Foundation, Inc.
      2 #
      3 # This file is part of GCC.
      4 #
      5 # GCC is free software; you can redistribute it and/or modify
      6 # it under the terms of the GNU General Public License as published by
      7 # the Free Software Foundation; either version 3, or (at your option)
      8 # any later version.
      9 #
     10 # GCC is distributed in the hope that it will be useful,
     11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13 # GNU General Public License for more details.
     14 #
     15 # You should have received a copy of the GNU General Public License
     16 # along with GCC; see the file COPYING3.  If not see
     17 # <http://www.gnu.org/licenses/>.
     18 
     19 # On Debian, Ubuntu and other derivative distributions, the 32bit libraries
     20 # are found in /lib32 and /usr/lib32, /lib64 and /usr/lib64 are symlinks to
     21 # /lib and /usr/lib, while other distributions install libraries into /lib64
     22 # and /usr/lib64.  The LSB does not enforce the use of /lib64 and /usr/lib64,
     23 # it doesn't tell anything about the 32bit libraries on those systems.  Set
     24 # MULTILIB_OSDIRNAMES according to what is found on the target.
     25 
     26 # To support i386, x86-64 and x32 libraries, the directory structrue
     27 # should be:
     28 #
     29 # 	/lib has i386 libraries.
     30 # 	/lib64 has x86-64 libraries.
     31 # 	/libx32 has x32 libraries.
     32 #
     33 comma=,
     34 MULTILIB_OPTIONS    = $(subst $(comma),/,$(TM_MULTILIB_CONFIG))
     35 MULTILIB_DIRNAMES   = $(patsubst m%, %, $(subst /, ,$(MULTILIB_OPTIONS)))
     36 MULTILIB_OSDIRNAMES = m64=../lib64$(call if_multiarch,:x86_64-linux-gnu)
     37 MULTILIB_OSDIRNAMES+= m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:i386-linux-gnu)
     38 MULTILIB_OSDIRNAMES+= mx32=../libx32$(call if_multiarch,:x86_64-linux-gnux32)
     39