From bdde4f5efa3c89ac7ee0bc05f322f27e3dabeab9 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 29 Mar 2013 09:10:06 +0400
Subject: [PATCH 13/46] 64-bit multilib hack.

GCC has internal multilib handling code but it assumes a very specific rigid directory
layout. The build system implementation of multilib layout is very generic and allows
complete customisation of the library directories.

This patch is a partial solution to allow any custom directories to be passed into gcc
and handled correctly. It forces gcc to use the base_libdir (which is the current
directory, "."). We need to do this for each multilib that is configured as we don't
know which compiler options may be being passed into the compiler. Since we have a compiler
per mulitlib at this point that isn't an issue.

The one problem is the target compiler is only going to work for the default multlilib at
this point. Ideally we'd figure out which multilibs were being enabled with which paths
and be able to patch these entries with a complete set of correct paths but this we
don't have such code at this point. This is something the target gcc recipe should do
and override these platform defaults in its build config.

RP 15/8/11

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Elvis Dowson <elvis.dowson@gmail.com>

Upstream-Status: Pending
---
 gcc/config/i386/t-linux64   |  6 ++----
 gcc/config/mips/t-linux64   | 10 +++-------
 gcc/config/rs6000/t-linux64 |  5 ++---
 3 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/gcc/config/i386/t-linux64 b/gcc/config/i386/t-linux64
index f6dbb78..d770da5 100644
--- a/gcc/config/i386/t-linux64
+++ b/gcc/config/i386/t-linux64
@@ -32,7 +32,5 @@
 #
 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$(call if_multiarch,:x86_64-linux-gnux32)
+MULTILIB_DIRNAMES = . .
+MULTILIB_OSDIRNAMES = ../$(shell basename $(base_libdir)) ../$(shell basename $(base_libdir))
diff --git a/gcc/config/mips/t-linux64 b/gcc/config/mips/t-linux64
index 7e96406..b72dcb0 100644
--- a/gcc/config/mips/t-linux64
+++ b/gcc/config/mips/t-linux64
@@ -17,10 +17,6 @@
 # <http://www.gnu.org/licenses/>.
 
 MULTILIB_OPTIONS = mabi=n32/mabi=32/mabi=64
-MULTILIB_DIRNAMES = n32 32 64
-MIPS_EL = $(if $(filter %el, $(firstword $(subst -, ,$(target)))),el)
-MIPS_SOFT = $(if $(strip $(filter MASK_SOFT_FLOAT_ABI, $(target_cpu_default)) $(filter soft, $(with_float))),soft)
-MULTILIB_OSDIRNAMES = \
-	../lib32$(call if_multiarch,:mips64$(MIPS_EL)-linux-gnuabin32$(MIPS_SOFT)) \
-	../lib$(call if_multiarch,:mips$(MIPS_EL)-linux-gnu$(MIPS_SOFT)) \
-	../lib64$(call if_multiarch,:mips64$(MIPS_EL)-linux-gnuabi64$(MIPS_SOFT))
+MULTILIB_DIRNAMES = . . .
+MULTILIB_OSDIRNAMES = ../$(shell basename $(base_libdir)) ../$(shell basename $(base_libdir)) ../$(shell basename $(base_libdir))
+
diff --git a/gcc/config/rs6000/t-linux64 b/gcc/config/rs6000/t-linux64
index b6b351d..1d5b37a 100644
--- a/gcc/config/rs6000/t-linux64
+++ b/gcc/config/rs6000/t-linux64
@@ -26,10 +26,9 @@
 # MULTILIB_OSDIRNAMES according to what is found on the target.
 
 MULTILIB_OPTIONS    := m64/m32
-MULTILIB_DIRNAMES   := 64 32
+MULTILIB_DIRNAMES   := . .
 MULTILIB_EXTRA_OPTS := 
-MULTILIB_OSDIRNAMES := m64=../lib64$(call if_multiarch,:powerpc64-linux-gnu)
-MULTILIB_OSDIRNAMES += m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:powerpc-linux-gnu)
+MULTILIB_OSDIRNAMES := ../$(shell basename $(base_libdir)) ../$(shell basename $(base_libdir))
 
 rs6000-linux.o: $(srcdir)/config/rs6000/rs6000-linux.c
 	$(COMPILE) $<
-- 
2.6.3