ExtUti...mlists(3perl) Perl Programmers Reference Guide ExtUti...mlists(3perl)
NAME
ExtUtils::Mksymlists - write linker options files for dynamic extension
SYNOPSIS
use ExtUtils::Mksymlists;
Mksymlists( NAME => $name ,
DL_VARS => [ $var1, $var2, $var3 ],
DL_FUNCS => { $pkg1 => [ $func1, $func2 ],
$pkg2 => [ $func3 ] );
DESCRIPTION
"ExtUtils::Mksymlists" produces files used by the linker under some OSs
during the creation of shared libraries for dynamic extensions. It is
normally called from a MakeMaker-generated Makefile when the extension
is built. The linker option file is generated by calling the function
"Mksymlists", which is exported by default from "ExtUtils::Mksymlists".
It takes one argument, a list of key-value pairs, in which the following
keys are recognized:
DLBASE
This item specifies the name by which the linker knows the
extension, which may be different from the name of the extension
itself (for instance, some linkers add an '_' to the name of the
extension). If it is not specified, it is derived from the NAME
attribute. It is presently used only by OS2 and Win32.
DL_FUNCS
This is identical to the DL_FUNCS attribute available via MakeMaker,
from which it is usually taken. Its value is a reference to an
associative array, in which each key is the name of a package, and
each value is an a reference to an array of function names which
should be exported by the extension. For instance, one might say
"DL_FUNCS => { Homer::Iliad => [ qw(trojans greeks) ],
Homer::Odyssey => [ qw(travellers family suitors) ] }". The
function names should be identical to those in the XSUB code;
"Mksymlists" will alter the names written to the linker option file
to match the changes made by xsubpp. In addition, if none of the
functions in a list begin with the string boot_, "Mksymlists" will
add a bootstrap function for that package, just as xsubpp does. (If
a boot_<pkg> function is present in the list, it is passed through
unchanged.) If DL_FUNCS is not specified, it defaults to the
bootstrap function for the extension specified in NAME.
DL_VARS
This is identical to the DL_VARS attribute available via MakeMaker,
and, like DL_FUNCS, it is usually specified via MakeMaker. Its
value is a reference to an array of variable names which should be
exported by the extension.
FILE
This key can be used to specify the name of the linker option file
(minus the OS-specific extension), if for some reason you do not
want to use the default value, which is the last word of the NAME
attribute (e.g. for "Tk::Canvas", FILE defaults to "Canvas").
FUNCLIST
This provides an alternate means to specify function names to be
exported from the extension. Its value is a reference to an array
of function names to be exported by the extension. These names are
passed through unaltered to the linker options file. Specifying a
value for the FUNCLIST attribute suppresses automatic generation of
the bootstrap function for the package. To still create the
bootstrap name you have to specify the package name in the DL_FUNCS
hash:
Mksymlists( NAME => $name ,
FUNCLIST => [ $func1, $func2 ],
DL_FUNCS => { $pkg => [] } );
IMPORTS
This attribute is used to specify names to be imported into the
extension. It is currently only used by OS/2 and Win32.
NAME
This gives the name of the extension (e.g. "Tk::Canvas") for which
the linker option file will be produced.
When calling "Mksymlists", one should always specify the NAME attribute.
In most cases, this is all that's necessary. In the case of unusual
extensions, however, the other attributes can be used to provide
additional information to the linker.
AUTHOR
Charles Bailey <bailey@newman.upenn.edu>
REVISION
Last revised 14-Feb-1996, for Perl 5.002.
perl v5.40.1 2026-08-30 ExtUti...mlists(3perl)
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