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

-qextname Option
Syntax
-qextname[=name1[:name2...]] | -qnoextname
EXTNAME[(name1: name2:...)] | NOEXTNAME
Adds an underscore to the names of all global entities, which helps in porting
programs from systems where this is a convention for mixed-language programs.
Use -qextname=name1[:name2...] to identify a specific global entity (or entities).
For a list of named entities, separate each name with a colon.
The name of a main program is not affected.
The -qextname option helps to port mixed-language programs to XL Fortran
without modifications. Use of this option avoids naming problems that might
otherwise be caused by:
v Fortran subroutines, functions, or common blocks that are named main, MAIN,
or have the same name as a system subroutine
v Non-Fortran routines that are referenced from Fortran and contain an underscore
at the end of the routine name
v
v
Note: XL Fortran Service and Utility Procedures, such as flush_ and dtime_,
have these underscores in their names already. By compiling with the
-qextname option, you can code the names of these procedures without
the trailing underscores.
Non-Fortran routines that call Fortran procedures and use underscores at the
end of the Fortran names
Non-Fortran external or global data objects that contain an underscore at the end
of the data name and are shared with a Fortran procedure
If your program has only a few instances of the naming problems that -qextname
solves, you may prefer to select new names with the -brename option of the ld
command.
Restrictions
You must compile all the source files for a program, including the source files of
any required module files, with the same -qextname setting.
If you use the xlfutility module to ensure that the Service and Utility subprograms
are correctly declared, you must change the name to xlfutility_extname when
compiling with -qextname.
If there is more than one Service and Utility subprogram referenced in a
compilation unit, using -qextname with no names specified and the
xlfutility_extname module may cause the procedure declaration check not to work
accurately.
158 XL Fortran Enterprise Edition for AIX : User’s Guide