Re: 32-bit distribution for ultrasparc

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

mrg%eterna.com.au@localhost wrote:

> the _LP64 define is set for 64 bit code.

I wonder which we should use _LP64 or __arch64__.

The former is defined in src/gnu/dist/gcc4/gcc/c-cppbuiltin.c
---
  /* Definitions for LP64 model.  */
  if (TYPE_PRECISION (long_integer_type_node) == 64
      && POINTER_SIZE == 64
      && TYPE_PRECISION (integer_type_node) == 32)
    {
      cpp_define (pfile, "_LP64");
      cpp_define (pfile, "__LP64__");
    }
---
and the latter is delived from src/gnu/dist/gcc4/gcc/config/sparc/sparc.h
---
/* Macro used later in this file to determine default architecture.  */
#define DEFAULT_ARCH32_P ((TARGET_DEFAULT & MASK_64BIT) == 0)

 :

#define CPP_ARCH32_SPEC ""
#define CPP_ARCH64_SPEC "-D__arch64__"

#define CPP_ARCH_DEFAULT_SPEC \
(DEFAULT_ARCH32_P ? CPP_ARCH32_SPEC : CPP_ARCH64_SPEC)
---
Izumi Tsutsui