HP aC++

To generate 32-bit mode code to run on HP-UX 64-bit systems, no new compiler command line options are required.

To compile in 64-bit mode, use the +DA2.0W command line option.




	NOTE: Applications written in HP C++ (cfront) must be migrated to aC++ prior to compiling in 64-bit mode. For information on migrating to aC++, see HP aC++ Migration Guide, URL: http://www.hp.com/lang/cpp/.

The aC++ compiler on HP-UX 11.0 includes support for both the 32-bit data model and the 64-bit data model. In 32-bit mode, integer, long, and pointer types are 32 bits in size. In 64-bit mode, long and pointer types are 64 bits in size, and integers are 32 bits.

The following new HP aC++ features are included in the 11.0 release:

Table 2-3 New aC++ Features

Feature	What it Does
`+DA2.0W`	Compiles in 64-bit mode for the PA-RISC 2.0 architecture. The macros `__LP64__` and `_PA_RISC2_0` are `#defined`.
`+DA2.0N`	Compiles in 32-bit mode for the PA-RISC 2.0 architecture. The macro `_PA_RISC2_0` is `#defined`. (Same as `+DA2.0`.)
`+hugesize`	Lowers the threshold for huge data objects allocated to the huge data space (`.hbss`).
`__LP64__`	Macro that is automatically defined by the HP aC++ compiler when compiling in 64-bit mode. Can be used within conditional directives to isolate 64-lbit mode code.

For More Information:

See Chapter 3 “HP-UX 64-bit Porting Concepts ”
See Chapter 4 “Transitioning C and aC++ Programs to 64-bit Mode ”
See the HP aC++ Release Notes for information about huge data.

HP aC++

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