nld Manual

nld Utility

nld Manual—528272-001

2-12

pTAL Programs

Because pTAL does not support embedded NonStop SQL/MP or a language-specific

run-time library, there are no special requirements for linking pTAL programs.

Mixed-Language Programs

You can create mixed-language programs containing native C modules, native C++

modules, native COBOL modules, and pTAL modules. The MAIN procedure in a

mixed-language program can be written in C/C++ or COBOL but not pTAL. Mixed-

language programs that include C/C++ modules require you to link to the same run-

time initialization code and SRLs that C or C++ programs do (see C++ Programs on

page 2-9). Mixed-language programs that include COBOL modules require you to link

to the same run-time libraries that COBOL programs do (see COBOL Programs on

page 2-11).

Programs With Embedded NonStop SQL/MP

Native C and native COBOL programs can contain embedded HP NonStop SQL/MP

statements. Use nld to create a single loadfile from multiple C or COBOL object files

that contain embedded SQL/MP statements. After creating a loadfile with nld, use the

SQL/MP compiler, SQLCOMP, to set up an executable SQL/MP application.

Always run nld before SQLCOMP. Do not run SQLCOMP on a linkfile and use the

resulting file as nld input.

A user library cannot contain embedded SQL/MP.

Linking User Libraries

A user library, which is optional, is a set of procedures that the operating system can

link to a program file at run time. Putting commonly used procedures in a user library

provides these benefits:

•

Reduces the storage required for object code on disk and in main memory

•

Shares a set of common procedures among applications

The first time you execute a program file after compilation, duplication, or change to

the -libname specification, the operating system searches the user library to resolve

each unresolved external reference before searching the system code and library.

The operating system resolves an external reference by changing the call in the

program file to point to the user library or to the system library. You can then run the

program file repeatedly (using the same -libname specification) without resolving the

reference again.