Open PL/I follows the native C compiler's naming conventions. This allows you to mix subroutines and functions compiled with Open PL/I with any other language or third-party library that supports a C language interface. However, you must link the Open PL/I run-time libraries into the final stand-alone program. The -cisam link option enables the C-ISAM package from Informix for VSAM/indexed files.
Informix fully documents their Application Programming Interface for the C language. In general, you should follow the Informix directions for mixing Informix and C, simply treating the modules compiled with Open PL/I as C modules.
The following examples illustrate the command used to link an Open PL/I program that uses the Informix libraries. For the purposes of this illustration the Open PL/I Compiler and Informix modules are running on a Sun Solaris system. The Open PL/I modules are called "testobj1.o" and "testobj 2.o", the Open PL/I Compiler has been installed in /opt /pl1, and the environment variable $MFPLI_PRODUCT_DIR has been set to that directory.
ldpli testobj1.o testobj2.o -o testprogram /opt/informix/lib/esql/libsql.a /opt/informix/lib/esql/libgen.a /opt/informix/lib/esql/libos.a /usr/ucblib/libucb.a /opt/SUNWspro/SC3.0/lib/cg92/_fstd.o
Note that the names and locations of the Open PL/I and Informix libraries are specific to your installation of Informix and Open PL/I. This illustrates a typical installation.