C/C++ Programmer's Guide (G06.27+, H06.03+)

Compiler Pragmas
HP C/C++ Programmer’s Guide for NonStop Systems—429301-010
13-112
VERSION3
°
nld Manual
°
noft Manual
•
Before compiling existing applications using VERSION3, you should first use the
MIGRATION_CHECK on page 13-62 directive along with the VERSION2 pragma to
examine the code for references to functions in changed or unsupported headers.
•
The VERSION3 Standard C++ Library supports wide characters as described in the
standard, and converts from Multi-Byte to wide.
•
At the G06.20 RVU, all the native C++ header files were combined into one
product number (T2824). These headers were modified to identify the version used
in the compile and to redirect calls to the correct library.
•
VERSION3 headers do not typically have a .h file extension. For example, you
should specify:
#include <iostream>
instead of: #include <iostream.h> (OSS)
or instead of: #include <iostreah> (Guardian)
For VERSION3 you can use the standard header names without truncation as long
as you also use the CPATHEQ file named SLMAP as described in Pragmas for the
Standard C++ Library on page 5-12.
•
The T2824 C++ headers include a few that end with .h (such as fstream.h and
iomanip.h) for compatibility with previous C++ versions. If you include one of
these .h header files when using VERSION3, the compiler issues this error:
This header file is incompatible with C++ version 3
•
HP recommends that VERSION3 users use the C-name headers that are part of
the Standard C++ Library instead of the older C headers. For example, specify:
#include <cstdio>
instead of:
#include <stdio.h>
•
If you include the RUNNABLE option when compiling VERSION3 on Guardian
environment (or if you do not include -c On OSS environment), the compiler
automatically links:
°
ZSTLSRL for TNS/R programs or ZCPPCDLL and ZCPP3DLL for TNS/E
programs (the Standard C++ Library and the C++ run-time library)
°
LIBCOBEY for a TNS/R program (an OBEY file that links the C run-time library
and the Common Run-Time Environment [CRE])
°
CPPINIT3 for a non-PIC code, or CPPINIT4 for a TNS/R PIC (lets you
override the new and delete functions)