the openat code uses stdarg functions but the func prototype isnt variable (it
doesnt end in ...) which of course causes a build failure

if current cvs head is configured with:
--enable-kernel=2.6.17

the build bombs:
x86_64-pc-linux-gnu-gcc ../sysdeps/unix/sysv/linux/openat.c -c -std=gnu99 -O2
-Wall -Winline -Wwrite-strings -fmerge-all-constants -g -Wstrict-prototypes    
 -I../include -I/usr/local/src/gnu/glibc-build/io
-I/usr/local/src/gnu/glibc-build -I../sysdeps/x86_64/elf
-I../nptl/sysdeps/unix/sysv/linux/x86_64 -I../sysdeps/unix/sysv/linux/x86_64
-I../sysdeps/unix/sysv/linux/wordsize-64 -I../nptl/sysdeps/unix/sysv/linux
-I../nptl/sysdeps/pthread -I../sysdeps/pthread
-I../ports/sysdeps/unix/sysv/linux -I../sysdeps/unix/sysv/linux -I../sysdeps/gnu
-I../sysdeps/unix/common -I../sysdeps/unix/mman -I../sysdeps/unix/inet
-I../nptl/sysdeps/unix/sysv -I../ports/sysdeps/unix/sysv -I../sysdeps/unix/sysv
-I../sysdeps/unix/x86_64 -I../nptl/sysdeps/unix -I../ports/sysdeps/unix
-I../sysdeps/unix -I../sysdeps/posix -I../sysdeps/x86_64/fpu
-I../nptl/sysdeps/x86_64 -I../sysdeps/x86_64 -I../sysdeps/wordsize-64
-I../sysdeps/ieee754/ldbl-96 -I../sysdeps/ieee754/dbl-64
-I../sysdeps/ieee754/flt-32 -I../sysdeps/ieee754 -I../sysdeps/generic/elf
-I../sysdeps/generic -I../nptl -I../ports  -I.. -I../libio -I. -nostdinc
-isystem /usr/lib/gcc/x86_64-pc-linux-gnu/4.1.1/include -isystem /usr/include
-D_LIBC_REENTRANT -include ../include/libc-symbols.h       -o
/usr/local/src/gnu/glibc-build/io/openat.o -MD -MP -MF
/usr/local/src/gnu/glibc-build/io/openat.o.dt -MT
/usr/local/src/gnu/glibc-build/io/openat.o
../sysdeps/unix/sysv/linux/openat.c:74: warning: function declaration isn't a
prototype
../sysdeps/unix/sysv/linux/openat.c:148: warning: function declaration isn't a
prototype
../sysdeps/unix/sysv/linux/openat.c: In function '__OPENAT':
../sysdeps/unix/sysv/linux/openat.c:156: error: 'va_start' used in function with
fixed args
make: *** [/usr/local/src/gnu/glibc-build/io/openat.o] Error 1