Re: Loading/registering multiple xsubs

On 12.10.2011 15:24, Jeffrey Ratcliffe wrote:
> On 12 October 2011 13:11, Torsten Schoenfeld<[email protected]>  wrote:
>> You have to call Foo_Bar.xs' BOOT section (which wires up the xsubs) from
>> Foo.xs' BOOT section.  Look at Glib.xs' BOOT section for an example.  For
>> Gtk2 and below, this is handled by Gtk2::CodeGen->write_boot.
>
> Thank you for your quick response. I'm still struggling, so I made a
> small example  (attached), which fails to compile, trying to base the
> boot mechanism on that in Glib:
>
> foo.xs: In function 'void boot_Foo(PerlInterpreter*, CV*)':
> foo.xs:18: error: expected unqualified-id before string constant
> foo.xs:18: error: 'boot_Foo__Bar' was not declared in this scope

Looks like Glib's mechanism is not C++-safe: specifically, the "extern 
XS" trick does not work because boot_Foo is already inside an <extern 
"C"> section.  Try this:

At the top of Foo.xs:

	extern "C" XS_EXTERNAL (boot_Foo__Bar);

In its BOOT section:

	_gperl_call_XS (aTHX_ boot_Foo__Bar, cv, mark);

If you want some backwards-compatibility, use

	#ifndef XS_EXTERNAL
	# define XS_EXTERNAL(name) XS(name)
	#endif