[gdb] Improve printing of float formats
Currently, on x86_64, a little endian target, I get: ... $ gdb -q -batch -ex "maint print architecture" | grep " = floatformat" gdbarch_dump: bfloat16_format = floatformat_bfloat16_big gdbarch_dump: double_format = floatformat_ieee_double_big gdbarch_dump: float_format = floatformat_ieee_single_big gdbarch_dump: half_format = floatformat_ieee_half_big gdbarch_dump: long_double_format = floatformat_i387_ext ... which suggests big endian. This is due to this bit of code in pformat: ... /* Just print out one of them - this is only for diagnostics. */ return format[0]->name; ... Fix this by using gdbarch_byte_order to pick the appropriate index, such that we have the more accurate: ... gdbarch_dump: bfloat16_format = floatformat_bfloat16_little gdbarch_dump: half_format = floatformat_ieee_half_little gdbarch_dump: float_format = floatformat_ieee_single_little gdbarch_dump: double_format = floatformat_ieee_double_little gdbarch_dump: long_double_format = floatformat_i387_ext ... Tested on x86_64-linux.
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