XL Fortran Enterprise Edition for AIX : User's Guide - IBM

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Do not use names that are the same as names in the XL Fortran library or one of
the system libraries. To determine which names are not safe to use in your
program, run the nm command on any libraries that are linked into the program
and search the output for names you suspect might also be in your program.
If your program calls certain XLF-provided routines, some restrictions apply to
the common block and subprogram names that you can use:
XLF-Provided Function Name
mclock
rand
Common Block or Subprogram Name You
Cannot Use
times
irand
Be careful not to use the names of subroutines or functions without defining the
actual routines in your program. If the name conflicts with a name from one of the
libraries, the program could use the wrong version of the routine and not produce
any compile-time or link-time errors.
If different versions of a routine occur in more than one library or object file, be
careful to use the specific version that you want. Specify the file with the correct
version as the first file on the command line or in the configuration file. If the file
is a library, specify the appropriate -l option first on the command line. This
technique does not apply to references between routines that are in the same
shared library or to routines that are explicitly imported from one shared library to
another.
Running XL Fortran Programs
The default file name for the executable program is a.out. You can select a different
name with the -o compiler option. You should avoid giving your programs the
same names as system or shell commands (such as test or cp), as you could
accidentally execute the wrong command. If a name conflict does occur, you can
execute the program by specifying a path name, such as ./test.
You can run a program by entering the path name and file name of an executable
object file along with any run-time arguments on the command line.
Canceling Execution
To suspend a running program, press the Ctrl+Z key while the program is in the
foreground. Use the fg command to resume running.
To cancel a running program, press the Ctrl+C key while the program is in the
foreground.
Running Previously Compiled Programs
Statically linked programs that you compiled with levels of XL Fortran prior to
Version 9.1 should continue to run with no change in performance or behavior.
They may not run on a system with a level of the operating system different from
the system on which they were compiled.
If you have dynamically linked programs compiled by XL Fortran Versions 2
through 8, you can run them on systems with the XL Fortran Version 9 libraries.
The programs will use the current compiler data formats and I/O behavior, which
are somewhat different from those of XL Fortran Version 2.
48 XL Fortran Enterprise Edition for AIX : User’s Guide