I've committed the attached patch.
2013-03-27 Andreas Krebbel <andreas.kreb...@de.ibm.com>
* config/s390/s390.h (TARGET_FLT_EVAL_METHOD): Define.
---
gcc/config/s390/s390.h | 5 +++++
1 file changed, 5 insertions(+)
Index: gcc/config/s390/s390.h
===================================================================
*** gcc/config/s390/s390.h.orig
--- gcc/config/s390/s390.h
*************** enum processor_flags
*** 164,169 ****
--- 164,174 ----
#define S390_TDC_INFINITY (S390_TDC_POSITIVE_INFINITY \
| S390_TDC_NEGATIVE_INFINITY )
+ /* This is used by float.h to define the float_t and double_t data
+ types. For historical reasons both are double on s390 what cannot
+ be changed anymore. */
+ #define TARGET_FLT_EVAL_METHOD 1
+
/* Target machine storage layout. */
/* Everything is big-endian. */
