Setting up c89 to work with the current z/OS XL C/C++ compiler

These are the export statements for each compiler version, assuming that the default high-level qualifiers are being used. Where the c89 environment variables are shown, the environment variables for c++ and cc must also be set.

For the current z/OS XL C/C++ compiler:
- If you are using the z/OS shell, issue the following command:
```
export STEPLIB="CBC.SCCNCMP"
```
- If you are using the tcsh shell, issue the following command:
```
setenv STEPLIB "CBC.SCCNCMP"
```
Because the current z/OS XL C/C++ compiler supports compiling code that is to run on previous releases of z/OS, you do not need to use any additional c89 environment variables. All you need to do is specify the c89 option -Wc,"target(LEVEL)", where LEVEL is the level of z/OS on which the program is to be executed. For more information see the description of the TARGET option in z/OS XL C/C++ User's Guide.

For the IBM® C/C++ V3R2 compiler:

If you are using the z/OS shell, issue the following commands:

export STEPLIB="CBC.V3R2M0.SCBC3CMP"
export _C89_CVERSION=Ox13020000
export _C89_CLIB_PREFIX=CBC.V3R1M0

If you are using the tcsh shell, issue the following commands:

setenv STEPLIB "CBC.V3R2M0.SCBC3CMP"
setenv _C89_CVERSION Ox13020000
setenv _C89_CLIB_PREFIX CBC.V3R1M0

For the AD/Cycle C/370™ V1R2 compiler:
- If you are using the z/OS shell, issue the following commands:
```
export STEPLIB="EDC.V1R2M0.SEDCDCMP"
export _C89_CVERSION=Ox11020000
export _C89_CLIB_PREFIX=EDC.V1R2M0)
```
- If you are using the tcsh shell, issue the following commands:
```
setenv STEPLIB "EDC.V1R2M0.SEDCDCMP"
setenv _C89_CVERSION Ox11020000
setenv _C89_CLIB_PREFIX EDC.V1R2M0)
```
Because this compiler only supports the C language, it cannot be used with the c++ command.