H-Series Application Migration Guide (H06.03+)

Native C and C++ Migration Tasks

H-Series Application Migration Guide—429855-006

5-4

Check Use of Feature Test Macro

The _TNS_E_TARGET feature test macro replaces the _TNS_R_TARGET macro in

the TNS/E native C and C++ compilers. This macro identifies the platform on which a

program is being compiled to run. It can be used to conditionally compile code, as in

this example:

#ifdef _TNS_E_TARGET

/* TNS/E-specific code goes here. */

#else

/* Other code goes here. */

#endif

Alternatively, you can use the _TANDEM_ARCH_ feature test macro to identify the

platform. This macro returns these values:

Code that was previously thought to be specific to TNS/R but could actually be

targeted to TNS/E native C or C++ should test this macro. You can also use this macro

to create programs to run on both native and non-native systems. For example:

#if _TANDEM_ARCH_ == 0

/* Non-native code goes here. */

#else

/* Native code goes here. */

#endif

Changed Pragmas and Flags

The native TNS/E C and C++ compilers support the same pragmas and flags as the

native TNS/R C and C++ compilers with the exceptions noted in this discussion. These

pragmas and flags are not meaningful or have different behavior on H-series systems.

In most cases, obsolete pragmas and flags have no effect if they appear an H-series

program.

Value Platform

0TNS

1TNS/R

2TNS/E

Note. Most pragmas have equivalent flags in the OSS and PC environments.