Build and use a 64-bit application under z/OS batch

Creating a 64-bit application under z/OS® batch is similar to creating a 31-bit application. There are, however, some subtle differences, which the following C++ example demonstrates.

As of z/OS C/C++ V1R6, new PROCs are available for binding and running with 64-bit applications. There are no new PROCs for a 64-bit compile (without binding or running) but you can use the previously existing C and C++ PROCs, along with the LP64 compiler option, to create 64-bit object files that can then be used with the new 64-bit enabled PROCs. Then, rather than using the regular binding PROCs (such as CBCB and EDCCBG), you need to use the new 64-bit PROCs for binding; for example, CBCQB and EDCQCBG.

Example: The following example shows how to implement these instructions. In this example, we use the CBCC PROC and the LP64 compiler option for our first 64-bit compile, and the CBCQCBG PROC to compile another source file in 64-bit mode, bind it (along with the first object file we produced), and finally run the resulting load module.

#include <iostream>                                                    
void lp64_function() {                                                  
#ifdef _LP64                                                            
  std::cout << "Hello World, z/OS has 64-bit programs now!" << std::endl;
#else                                                                   
  std::cout << "Uh oh, someone didn't compile this file with LP64" << std::endl;
#endif                                                                  
 }

HELLO2.C
void lp64_function();
int main() {         
  lp64_function();   
}

//USERID   JOB (641A,2317),'Programmer Name',REGION=128M,
//         CLASS=B,MSGCLASS=S,NOTIFY=&SYSUID;,MSGLEVEL=(1,1)
//ORDER JCLLIB ORDER=(CBC.SCCNPRC)
//*---------------------------------------------------------------------
//* C++ Compile using LP64 compiler option
//*---------------------------------------------------------------------
//COMPILE  EXEC CBCC,
//         INFILE='USERID.LP64.SOURCE(HELLO1)',
//         OUTFILE='USERID.LP64.OBJECT(HELLO1),DISP=SHR',
//         CPARM='OPTFILE(DD:OPTIONS)'
//OPTIONS  DD DATA,DLM='/>'
  LP64
/>
//*---------------------------------------------------------------------
//* C++ 64-bit Compile, Bind, and Go Step
//*---------------------------------------------------------------------
//COBINDGO EXEC CBCQCBG,
//         INFILE='USERID.LP64.SOURCE(HELLO2)',
//         OUTFILE='USERID.LP64.LOAD(HELLO),DISP=SHR'
//BIND.SYSIN DD DATA,DLM='/>'
 INCLUDE OBJECT(HELLO1)
/>
//OBJECT   DD DSN=USERID.LP64.OBJECT,DISP=SHR