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https://bugs.gentoo.org/675954
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90077

diff -Naur gcc-9.3.0.orig/gcc/config/aarch64/t-aarch64-linux gcc-9.3.0/gcc/config/aarch64/t-aarch64-linux
--- gcc-9.3.0.orig/gcc/config/aarch64/t-aarch64-linux	2020-10-05 02:59:12.767988285 -0700
+++ gcc-9.3.0/gcc/config/aarch64/t-aarch64-linux	2020-10-05 03:03:32.310816444 -0700
@@ -22,7 +22,7 @@
 LIB1ASMFUNCS = _aarch64_sync_cache_range
 
 AARCH_BE = $(if $(findstring TARGET_BIG_ENDIAN_DEFAULT=1, $(tm_defines)),_be)
-MULTILIB_OSDIRNAMES = mabi.lp64=../lib64$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu)
+MULTILIB_OSDIRNAMES = mabi.lp64=../lib
 MULTIARCH_DIRNAME = $(call if_multiarch,aarch64$(AARCH_BE)-linux-gnu)
 
 MULTILIB_OSDIRNAMES += mabi.ilp32=../libilp32$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu_ilp32)
diff -Naur gcc-9.3.0.orig/gcc/config/i386/t-linux64 gcc-9.3.0/gcc/config/i386/t-linux64
--- gcc-9.3.0.orig/gcc/config/i386/t-linux64	2020-10-05 02:59:12.757989347 -0700
+++ gcc-9.3.0/gcc/config/i386/t-linux64	2020-10-05 03:24:58.878825272 -0700
@@ -33,6 +33,6 @@
 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$(call if_multiarch,:x86_64-linux-gnux32)
+MULTILIB_OSDIRNAMES = m64=../lib
+MULTILIB_OSDIRNAMES+= m32=../lib32
+MULTILIB_OSDIRNAMES+= mx32=../libx32
diff -Naur gcc-9.3.0.orig/gcc/config/rs6000/t-linux gcc-9.3.0/gcc/config/rs6000/t-linux
--- gcc-9.3.0.orig/gcc/config/rs6000/t-linux	2020-10-05 02:59:12.767988285 -0700
+++ gcc-9.3.0/gcc/config/rs6000/t-linux	2020-10-05 03:03:32.310816444 -0700
@@ -2,7 +2,8 @@
 # or soft-float.
 ifeq (,$(filter $(with_cpu),$(SOFT_FLOAT_CPUS))$(findstring soft,$(with_float)))
 ifneq (,$(findstring powerpc64,$(target)))
-MULTILIB_OSDIRNAMES := .=../lib64$(call if_multiarch,:powerpc64-linux-gnu)
+MULTILIB_OSDIRNAMES := m64=../lib
+MULTILIB_OSDIRNAMES += m32=../lib32
 else
 MULTIARCH_DIRNAME := $(call if_multiarch,powerpc-linux-gnu)
 endif
@@ -10,7 +11,8 @@
 MULTIARCH_DIRNAME := $(subst -linux,le-linux,$(MULTIARCH_DIRNAME))
 endif
 ifneq (,$(findstring powerpc64le,$(target)))
-MULTILIB_OSDIRNAMES := $(subst -linux,le-linux,$(MULTILIB_OSDIRNAMES))
+MULTILIB_OSDIRNAMES := m64=../lib
+MULTILIB_OSDIRNAMES += m32=../lib32
 endif
 endif
 
diff -Naur gcc-9.3.0.orig/gcc/config/rs6000/t-linux64 gcc-9.3.0/gcc/config/rs6000/t-linux64
--- gcc-9.3.0.orig/gcc/config/rs6000/t-linux64	2020-10-05 02:59:12.767988285 -0700
+++ gcc-9.3.0/gcc/config/rs6000/t-linux64	2020-10-05 03:03:32.310816444 -0700
@@ -28,8 +28,8 @@
 MULTILIB_OPTIONS    := m64/m32
 MULTILIB_DIRNAMES   := 64 32
 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 := m64=../lib
+MULTILIB_OSDIRNAMES += m32=../lib32
 
 rs6000-linux.o: $(srcdir)/config/rs6000/rs6000-linux.c
 	$(COMPILE) $<
diff -Naur gcc-9.3.0.orig/gcc/config/rs6000/t-linux64bele gcc-9.3.0/gcc/config/rs6000/t-linux64bele
--- gcc-9.3.0.orig/gcc/config/rs6000/t-linux64bele	2020-10-05 02:59:12.767988285 -0700
+++ gcc-9.3.0/gcc/config/rs6000/t-linux64bele	2020-10-05 03:03:32.310816444 -0700
@@ -2,6 +2,6 @@
 
 MULTILIB_OPTIONS    += mlittle
 MULTILIB_DIRNAMES   += le
-MULTILIB_OSDIRNAMES += $(subst =,.mlittle=,$(subst lible32,lib32le,$(subst lible64,lib64le,$(subst lib,lible,$(subst -linux,le-linux,$(MULTILIB_OSDIRNAMES))))))
-MULTILIB_OSDIRNAMES += $(subst $(if $(findstring 64,$(target)),m64,m32).,,$(filter $(if $(findstring 64,$(target)),m64,m32).mlittle%,$(MULTILIB_OSDIRNAMES)))
+MULTILIB_OSDIRNAMES = m64=../lib
+MULTILIB_OSDIRNAMES+= m32=../lib32
 MULTILIB_MATCHES    := ${MULTILIB_MATCHES_ENDIAN}
diff -Naur gcc-9.3.0.orig/gcc/config/rs6000/t-linux64lebe gcc-9.3.0/gcc/config/rs6000/t-linux64lebe
--- gcc-9.3.0.orig/gcc/config/rs6000/t-linux64lebe	2020-10-05 02:59:12.777987222 -0700
+++ gcc-9.3.0/gcc/config/rs6000/t-linux64lebe	2020-10-05 03:03:32.310816444 -0700
@@ -2,6 +2,6 @@
 
 MULTILIB_OPTIONS    += mbig
 MULTILIB_DIRNAMES   += be
-MULTILIB_OSDIRNAMES += $(subst =,.mbig=,$(subst libbe32,lib32be,$(subst libbe64,lib64be,$(subst lib,libbe,$(subst le-linux,-linux,$(MULTILIB_OSDIRNAMES))))))
-MULTILIB_OSDIRNAMES += $(subst $(if $(findstring 64,$(target)),m64,m32).,,$(filter $(if $(findstring 64,$(target)),m64,m32).mbig%,$(MULTILIB_OSDIRNAMES)))
+MULTILIB_OSDIRNAMES := m64=../lib
+MULTILIB_OSDIRNAMES += m32=../lib32
 MULTILIB_MATCHES    := ${MULTILIB_MATCHES_ENDIAN}