toolchain/51082: build.sh fails on release cross-compilation

[triaxx%triaxx.org@localhost]

>Number:         51082
>Category:       toolchain
>Synopsis:       build.sh fails on release cross-compilation
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 21 11:50:00 +0000 2016
>Originator:     Frédéric Fauberteau
>Release:        netbsd-current
>Organization:
>Environment:
Linux ultralisk 4.5.1-1-ARCH #1 SMP PREEMPT Thu Apr 14 19:19:32 CEST 2016 x86_64 GNU/Linux
>Description:
I can successfuly build a netbsd-7 release for amd64 from a Linux box. But when I try to build a netbsd-current release under the same conditions as those, I get the following errors:

#   compile  backend/gengtype.lo
c++ -O -I. -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/usr.bin/backend/../gcc/arch/x86_64 -DIN_GCC -DHAVE_CONFIG_H -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/. -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../include -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libcpp/include -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libdecnumber -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libdecnumber/dpd -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libbacktrace -DGENERATOR_FILE -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/usr.bin/backend/.. -c -o gengtype.lo.o -UGENERATOR_FILE -DHOST_GENERATOR_FILE   /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/gengtype.c
In file included from /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/usr.bin/backend/../gcc/arch/x86_64/config.h:12:0,
                 from /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/gengtype.c:21:
/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../include/ansidecl.h:171:64: error: ambiguating new declaration of 'char* basename(const char*)'
 #  define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
                                                                ^
/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../include/libiberty.h:112:64: note: in expansion of macro 'ATTRIBUTE_NONNULL'
 extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
                                                                ^
In file included from /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/system.h:236:0,
                 from /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/gengtype.c:26:
/usr/include/string.h:596:26: note: old declaration 'const char* basename(const char*)'
 extern "C++" const char *basename (const char *__filename)
                          ^
In file included from /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/system.h:674:0,
                 from /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/gengtype.c:26:
/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../include/libiberty.h:691:50: error: declaration of 'int strverscmp(const char*, const char*)' has a different exception specifier
 extern int strverscmp (const char *, const char *);
                                                  ^
/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../include/libiberty.h:664:12: error: from previous declaration 'int strverscmp(const char*, const char*) throw ()'
 extern int strverscmp (const char *, const char *);
            ^

*** Failed target:  gengtype.lo
*** Failed command: c++ -O -I. -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/usr.bin/backend/../gcc/arch/x86_64 -DIN_GCC -DHAVE_CONFIG_H -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/. -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../include -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libcpp/include -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libdecnumber -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libdecnumber/dpd -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/../libbacktrace -DGENERATOR_FILE -I/home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/usr.bin/backend/.. -c -o gengtype.lo.o -UGENERATOR_FILE -DHOST_GENERATOR_FILE /home/triaxx/dev/nbsd/netbsd-current/usr/src/external/gpl3/gcc/dist/gcc/gengtype.
 c
*** Error code 1
>How-To-Repeat:
./build.sh -m amd64 -D ../destdir -O ../objdir -R ../releasedir -T ../tooldir -U release
>Fix: