1506-007 (S) "struct _dtoa_state" is undefined on AIX about cpython

[vstinner]

What's the value of _PY_SHORT_FLOAT_REPR? Look in pyconfig.h file.

The structure is defined in Include/internal/pycore_dtoa.h.

[vstinner]

Ah wait, the macro is defined in: Include/internal/pycore_pymath.h

//--- _PY_SHORT_FLOAT_REPR macro -------------------------------------------

// If we can't guarantee 53-bit precision, don't use the code
// in Python/dtoa.c, but fall back to standard code.  This
// means that repr of a float will be long (17 significant digits).
//
// Realistically, there are two things that could go wrong:
//
// (1) doubles aren't IEEE 754 doubles, or
// (2) we're on x86 with the rounding precision set to 64-bits
//     (extended precision), and we don't know how to change
//     the rounding precision.
#if !defined(DOUBLE_IS_LITTLE_ENDIAN_IEEE754) && \
    !defined(DOUBLE_IS_BIG_ENDIAN_IEEE754) && \
    !defined(DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754)
#  define _PY_SHORT_FLOAT_REPR 0
#endif

// Double rounding is symptomatic of use of extended precision on x86.
// If we're seeing double rounding, and we don't have any mechanism available
// for changing the FPU rounding precision, then don't use Python/dtoa.c.
#if defined(X87_DOUBLE_ROUNDING) && !defined(HAVE_PY_SET_53BIT_PRECISION)
#  define _PY_SHORT_FLOAT_REPR 0
#endif

#ifndef _PY_SHORT_FLOAT_REPR
#  define _PY_SHORT_FLOAT_REPR 1
#endif