xlC的64编译模式

 

在AIX上编译64位的库基本上有两个方法一个是设置OBJECT_MODE环境变量，另一个是使用-q64的编译选项。

关于OBJECT_MODE环境变量：

The AIX operating system provides support for the OBJECT_MODE environment variable to enable the user to obtain a 64-bit development environment. AIX tools use the setting of OBJECT_MODE to determine the type of object to be used or created. The OBJECT_MODE environment variable has three recognized settings:

OBJECT_MODE =32

Works with 32-bit objects

OBJECT_MODE =64

Works with 64-bit objects

OBJECT_MODE =32_64

Works with either 32-bit or 64-bit objects

 

 

关于-q64:

-q32, -q64

Description

Selects either 32-bit or 64-bit compiler mode.

Notes

The -q32 and -q64 options override the compiler mode set by the value of the OBJECT_MODE environment variable, if it exists. If this option is not explicitly specified on the command line, and the OBJECT_MODE environment variable is not set, the compiler will default to 32-bit output mode.

If the compiler is invoked in 64-bit mode, the __64BIT__ preprocessor macro is defined.