Building master on Windows fails with undefined reference to `__builtin_assume_aligned'

[martin rudalics]

A CFLAGS='-O3' build of master currently fails on my Windows XP thusly:

....
....
....
make[2]: Leaving directory `/c/emacs-git/trunk/opt/admin/charsets'
  CC       firstfile.o
  CC       dispnew.o
In file included from ../../src/dispnew.c:26:0:
../../src/lisp.h: In function 'XUNTAG':
../../src/lisp.h:878:3: warning: implicit declaration of function 
'__builtin_assume_aligned' [-Wimplicit-function-declaration]
../../src/lisp.h:878:3: warning: return makes pointer from integer without a 
cast [enabled by default]
  CC       frame.o
In file included from ../../src/frame.c:28:0:
../../src/lisp.h: In function 'XUNTAG':
../../src/lisp.h:878:3: warning: implicit declaration of function 
'__builtin_assume_aligned' [-Wimplicit-function-declaration]
../../src/lisp.h:878:3: warning: return makes pointer from integer without a 
cast [enabled by default]
make[2]: Entering directory `/c/emacs-git/trunk/opt/admin/charsets'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/c/emacs-git/trunk/opt/admin/charsets'
  CC       scroll.o
....
....
....
  CC       tparam.o
In file included from ../../src/tparam.c:21:0:
../../src/lisp.h: In function 'XUNTAG':
../../src/lisp.h:878:3: warning: implicit declaration of function 
'__builtin_assume_aligned' [-Wimplicit-function-declaration]
../../src/lisp.h:878:3: warning: return makes pointer from integer without a 
cast [enabled by default]
  CC       lastfile.o
In file included from ../../src/lastfile.c:39:0:
../../src/lisp.h: In function 'XUNTAG':
../../src/lisp.h:878:3: warning: implicit declaration of function 
'__builtin_assume_aligned' [-Wimplicit-function-declaration]
../../src/lisp.h:878:3: warning: return makes pointer from integer without a 
cast [enabled by default]
  CCLD     temacs.exe
dispnew.o:dispnew.c:(.text+0x75): undefined reference to 
`__builtin_assume_aligned'
dispnew.o:dispnew.c:(.text+0xbd): undefined reference to 
`__builtin_assume_aligned'
dispnew.o:dispnew.c:(.text+0xe1): undefined reference to 
`__builtin_assume_aligned'
dispnew.o:dispnew.c:(.text+0x116): undefined reference to 
`__builtin_assume_aligned'
dispnew.o:dispnew.c:(.text+0x13f): undefined reference to 
`__builtin_assume_aligned'
dispnew.o:dispnew.c:(.text+0x212): more undefined references to 
`__builtin_assume_aligned' follow
collect2: ld returned 1 exit status
make[1]: *** [temacs.exe] Error 1
make[1]: Leaving directory `/c/emacs-git/trunk/opt/src'
make: *** [src] Error 2

Help appreciated, martin