glibc-2.12.90-17 doesn't build on s390(x)

ake -s subdir=math -C math ..=../ others
make[2]: Entering directory `/builddir/build/BUILD/glibc-2.12-192-g7c08a05/math'
make[2]: Leaving directory `/builddir/build/BUILD/glibc-2.12-192-g7c08a05/math'
make[2]: Entering directory `/builddir/build/BUILD/glibc-2.12-192-g7c08a05/math'
In file included from ../sysdeps/ieee754/ldbl-64-128/s_fmal.c:4:0:
../sysdeps/ieee754/ldbl-128/s_fmal.c: In function '__fmal':
../sysdeps/ieee754/ldbl-128/s_fmal.c:179:7: error: output operand constraint lacks '='
../sysdeps/ieee754/ldbl-128/s_fmal.c:179:7: error: output operand constraint lacks '='
../sysdeps/ieee754/ldbl-128/s_fmal.c:179:7: error: invalid lvalue in asm output 0
make[2]: *** [/builddir/build/BUILD/glibc-2.12-192-g7c08a05/build-s390-linuxnptl/math/s_fmal.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/builddir/build/BUILD/glibc-2.12-192-g7c08a05/math'
make[1]: *** [math/others] Error 2
make[1]: Leaving directory `/builddir/build/BUILD/glibc-2.12-192-g7c08a05'
make: *** [all] Error 2

problematic code in s_fmal.c:
      if ((u.ieee.mantissa3 & 1) == 0)
        u.ieee.mantissa3 |= fetestexcept (FE_INEXACT) != 0;
      v.d = a1 + u.d;
      /* Ensure the addition is not scheduled after fetestexcept call.  */
==>>  asm volatile ("" : "m" (v));
      int j = fetestexcept (FE_INEXACT) != 0;
      feupdateenv (&env);