Build failing on new gdb?

[Tom Ivar Helbekkmo <tih%hamartun.priv.no@localhost>]

Trying to update to a fresh current, I get:

#    create  libgdb/ada-lang.d
CC=/usr/tools/bin/x86_64--netbsd-c++\ -std=gnu++11\ -Wno-error=stack-protector /usr/tools/bin/nbmkdep -f ada-lang.d.tmp  --      --sysroot=/usr/arena/amd64 -D_KERNTYPES -I/usr/src/external/gpl3/gdb/lib/libgdb -I/usr/src/external/gpl3/gdb/lib/libgdb/arch/x86_64 -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/config -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/common -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/gnulib/import -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/include/opcode -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/libdecnumber -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist -I/usr/src/external/gpl3/gdb/lib/libgdb/../libbfd/arch/x86_64 -I/usr/src/external/gpl3/gdb/lib/libgdb/../libdecnumber/arch/x86_64 -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/bfd -I/usr/src/external/gpl3/gdb/lib/libgdb/../../dist/include -Dsighandler_t=sig_t -DTARGET_SYSTEM_ROOT=\"\" -DTARGET_SYSTEM_ROOT_RELOCATABLE=0 -DBINDIR=\"/usr/bin\" -DLOCALEDIR=\"/usr/share/locale\" -DHAVE_CONFIG_H -DTUI=1 -D_KERNTYPES -D_KERNTYPES     /usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/ada-lang.c &&  mv ada-lang.d.tmp ada-lang.d
In file included from /usr/arena/amd64/usr/include/g++/chrono:35:0,
                 from /usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/utils.h:26,
                 from /usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/defs.h:751,
                 from /usr/src/external/gpl3/gdb/lib/libgdb/../../dist/gdb/ada-lang.c:21:
/usr/arena/amd64/usr/include/g++/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support \
  ^
nbmkdep: compile failed.
*** [ada-lang.d] Error code 1
nbmake[9]: stopped in /usr/src/external/gpl3/gdb/lib/libgdb

-tih
-- 
Most people who graduate with CS degrees don't understand the significance
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