The TPF assembler supports dwarf4 discriminators, but the TPF debuggers do not. Ok to apply?
* config/s390/tpf.h (SUPPORTS_DISCRIMINATOR): Define to 0 for TPF. Index: gcc/config/s390/tpf.h =================================================================== --- gcc/config/s390/tpf.h (revision 189993) +++ gcc/config/s390/tpf.h (working copy) @@ -116,3 +116,6 @@ #define MATH_LIBRARY "CLBM" #define LIBSTDCXX "CPP2" #endif /* ! _TPF_H */ + +/* GAS supports it, but the debuggers don't, so avoid it. */ +#define SUPPORTS_DISCRIMINATOR 0