File: gawk.info,  Node: OpenVMS Dynamic Extensions,  Next: OpenVMS Installation Details,  Prev: OpenVMS Compilation,  Up: OpenVMS Installation

B.3.2.2 Compiling 'gawk' Dynamic Extensions on OpenVMS
......................................................

The extensions that have been ported to OpenVMS can be built using one
of the following commands:

     $ MMS/DESCRIPTION=[.vms]descrip.mms extensions

or:

     $ MMK/DESCRIPTION=[.vms]descrip.mms extensions

   'gawk' uses 'AWKLIBPATH' as either an environment variable or a
logical name to find the dynamic extensions.

   Dynamic extensions need to be compiled with the same compiler options
for floating-point, pointer size, and symbol name handling as were used
to compile 'gawk' itself.  Alpha and Itanium should use IEEE floating
point.  The pointer size is 32 bits, and the symbol name handling should
be exact case with CRC shortening for symbols longer than 32 bits.

     /name=(as_is,short)
     /float=ieee/ieee_mode=denorm_results

   Compile-time macros need to be defined before the first
OpenVMS-supplied header file is included, as follows:

     #if (__CRTL_VER >= 70200000)
     #define _LARGEFILE 1
     #endif

     #ifdef __CRTL_VER
     #if __CRTL_VER >= 80200000
     #define _USE_STD_STAT 1
     #endif
     #endif

   If you are writing your own extensions to run on OpenVMS, you must
supply these definitions yourself.  The 'config.h' file created when
building 'gawk' on OpenVMS does this for you; if instead you use that
file or a similar one, then you must remember to include it before any
OpenVMS-supplied header files.