Until a fix for this bug is found, there are two possible workarounds:

- Compile kernels sound system as modules and compile these modules with
  -O1 instead of default -Os or -O2 (e.g. by changing main Makefile).

- Use this patch from Fengwei Yin <yfw.debian@gmail.com> (then -Os or -O2
  should work).

See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27363 for details.
Signed-off-by: Fengwei Yin <yfw.debian@gmail.com>