Bug#632667: empty biarch -dev packages

[Matthias Klose <doko@debian.org>]

Package: eglibc
Version: 2.13-9
Severity: serious

trying to build gcc-4.x:

make[7]: Entering directory
`/home/packages/gcc/4.6/gcc-4.6-4.6.1/build/x86_64-linux-gnu/32/libgcc'
# If this is the top-level multilib, build all the other
# multilibs.
/home/packages/gcc/4.6/gcc-4.6-4.6.1/build/./gcc/xgcc
-B/home/packages/gcc/4.6/gcc-4.6-4.6.1/build/./gcc/ -B/usr/x86_64-linux-gnu/bin/
-B/usr/x86_64-linux-gnu/lib/ -isystem /usr/x86_64-linux-gnu/include -isystem
/usr/x86_64-linux-gnu/sys-include    -g -O2 -m32 -O2  -g -O2 -DIN_GCC   -W -Wall
-Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT
-DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I.
-I../../.././gcc -I../../../../src/libgcc -I../../../../src/libgcc/.
-I../../../../src/libgcc/../gcc -I../../../../src/libgcc/../include
-I../../../../src/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS
 -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c
../../../../src/libgcc/../gcc/libgcc2.c \
          -fvisibility=hidden -DHIDE_EXPORTS
In file included from /usr/include/stdio.h:28:0,
                 from ../../../../src/libgcc/../gcc/tsystem.h:87,
                 from ../../../../src/libgcc/../gcc/libgcc2.c:29:
/usr/include/features.h:323:26: fatal error: bits/predefs.h: No such file or
directory
compilation terminated.
make[7]: *** [_muldi3.o] Error 1


maybe caused by

  * Install arch dependent headers in the multiarch include directory, patch by
    Marcin Juszkiewicz. Tag libc*-dev as Multi-Arch: same.

looks like the headers are only moved for the libc build, not for the biarch build.