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Only in binutils-2.34/gold: autom4te.cache
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diff -rup binutils.orig/gold/configure binutils-2.34/gold/configure
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--- binutils.orig/gold/configure	2020-04-20 12:35:13.048297305 +0100
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+++ binutils-2.34/gold/configure	2020-04-20 14:02:06.743725696 +0100
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@@ -5180,7 +5180,8 @@ for targ in $target $canon_targets; do
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     . ${srcdir}/configure.tgt
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     if test "$targ_obj" = "UNKNOWN"; then
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-      as_fn_error $? "\"unsupported target $targ\"" "$LINENO" 5
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+      { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: \"unsupported target $targ\"" >&5
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+$as_echo "$as_me: WARNING: \"unsupported target $targ\"" >&2;}
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     else
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       targetobjs="$targetobjs ${targ_obj}.\$(OBJEXT)"
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       if test "$targ_extra_obj" != ""; then
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diff -rup binutils.orig/gold/configure.ac binutils-2.34/gold/configure.ac
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--- binutils.orig/gold/configure.ac	2020-04-20 12:35:13.050297291 +0100
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+++ binutils-2.34/gold/configure.ac	2020-04-20 14:01:46.435868770 +0100
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@@ -181,7 +181,7 @@ for targ in $target $canon_targets; do
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     . ${srcdir}/configure.tgt
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     if test "$targ_obj" = "UNKNOWN"; then
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-      AC_MSG_ERROR("unsupported target $targ")
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+      AC_MSG_WARN("unsupported target $targ")
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     else
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       targetobjs="$targetobjs ${targ_obj}.\$(OBJEXT)"
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       if test "$targ_extra_obj" != ""; then
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--- binutils.orig/ld/configure.tgt	2020-04-20 12:35:12.465301359 +0100
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+++ binutils-2.34/ld/configure.tgt	2020-04-20 14:17:52.123066333 +0100
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@@ -220,7 +220,7 @@ bfin-*-linux-uclibc*)	targ_emul=elf32bfi
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 			targ_extra_emuls="elf32bfin"
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 			targ_extra_libpath=$targ_extra_emuls
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 			;;
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-bpf-*-*)		targ_emul=elf64bpf
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+bpf-* | bpf-*-*)	targ_emul=elf64bpf
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 			;;
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 cr16-*-elf*)		targ_emul=elf32cr16
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 			;;
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@@ -1026,7 +1026,7 @@ z8k-*-coff)		targ_emul=z8002
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 			targ_extra_ofiles=
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 			;;
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 *)
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-  echo 2>&1 "*** ld does not support target ${targ}"
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+  echo 2>&1 "*** ld does not support target '${targ}' NO REALLY"
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   echo 2>&1 "*** see ld/configure.tgt for supported targets"
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   exit 1
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--- binutils.orig/bfd/config.bfd	2020-04-20 12:35:13.038297375 +0100
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+++ binutils-2.34/bfd/config.bfd	2020-04-20 14:25:26.452869193 +0100
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@@ -473,7 +473,7 @@ case "${targ}" in
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     ;;
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 #ifdef BFD64
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-  bpf-*-none)
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+  bpf-*-none | bpf-*)
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     targ_defvec=bpf_elf64_le_vec
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     targ_selvecs=bpf_elf64_be_vec
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     targ_underscore=yes
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@@ -1427,7 +1427,7 @@ case "${targ}" in
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     ;;
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   *)
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-    echo 1>&2 "*** BFD does not support target ${targ}."
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+    echo 1>&2 "*** BFD does not support target '${targ}'.  Honest."
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     echo 1>&2 "*** Look in bfd/config.bfd for supported targets."
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     exit 1
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     ;;