Those methods which override default MM_Unix methods are marked
``(override)'', while methods unique to MM_VMS are marked ``(specific)''.
For overridden methods, documentation is limited to an explanation
of why this method overrides the MM_Unix method; see the ExtUtils::MM_Unix
documentation for more details.
Try to determine name of extension being built. We begin with the name
of the current directory. Since VMS filenames are case-insensitive,
however, we look for a .pm file whose name matches that of the current
directory (presumably the 'main' .pm file for this extension), and try
to find a package statement from which to obtain the Mixed::Case
Follows VMS naming conventions for executable files.
If the name passed in doesn't exactly match an executable file,
appends .Exe (or equivalent) to check for executable image, and .Com
to check for DCL procedure. If this fails, checks directories in DCL$PATH
and finally Sys$System: for an executable file having the name specified,
with or without the .Exe-equivalent suffix.
Bypass shell script and produce qualifiers for CC directly (but warn
user if a shell script for this extension exists). Fold multiple
/Defines into one, since some C compilers pay attention to only one
instance of this qualifier on the command line.
DCL still accepts a maximum of 255 characters on a command
line, so we write the (potentially) long list of file names
to a temp file, then persuade Perl to read it instead of the
command line to find args.
Adds a few MM[SK] macros, and shortens some the installatin commands,
in order to stay under DCL's 255-character limit. Also changes
EQUALIZE_TIMESTAMP to set revision date of target file to one second
later than source file, since MMK interprets precisely equal revision
dates for a source and target file as a sign that the target needs
to be updated.
Undertake to build a new set of Perl images using VMS commands. Since
VMS does dynamic loading, it's not necessary to statically link each
extension into the Perl image, so this isn't the normal build path.
Consequently, it hasn't really been tested, and may well be incomplete.