Converting libfoo.so for linux to freebsd

[Norikatsu Shigemura]

	Linuxpluginwrapper(LPW) is a most famous killer application
	of libmap.conf(5)!  (I think:-)

On Thu, 11 Aug 2005 10:46:04 -0600 (MDT)
"M. Warner Losh" <imp at bsdimp.com> wrote:
> Here's a breif outline of what I've learned:
> 	(1) To remove the symbol versioning goo from a shared library,
> 		objcopy -R .gnu.version linux.so freebsd.so
> 	(there's also a .gnu.version_r on some libraries, that can
> 	also be removed this way).  Doing this allows one to directly
> 	link the .so into your program, modulo ABI issues.

	Humm,  When I made LPW,  I didn't have a trouble about symbol
	versioning.  I think no need objcopy.

> 	(2) dlopen (and likely ld-elf.so in general) doesn't check the
> 	version information at all.  If all you are doing is linking
> 	dynamically at run time, you don't have to perform step #1.
> 	The compile time linker, however, whines about missing symbol
> 	versions.
> 	(3) Use libmap.conf to map libc.so.6 for the shared library
> 	that you are loading to overcome ABI issues.  See the man page
> 	for an example.

	Humm.. I have no comment.

> The linuxplugwrapper port can be used to generate shims for the ABI
> issues, in general, and works well.  I'll likely not use it for the
> brother scanner port I'm working on since all I need is stderr defined
> in a linuxly correct, and I can do that in the source part of the
> driver.  I'd love to get the network side of things working, but I
> think that might be more effort than I care to go to at the moment.
> I'd also like to get faxing and printing working, but again, time...
> I bought it for the 35 sheet document feeder + scanner at $100.00
> after rebate :-)

	LPW has a FORCE ABOUTER[TM:-)].
	$ cd /usr/ports/www/linuxpluginwrapper
	$ make extract
	$ cd work/linuxpluginwrapper-20050613
	$ make dummy.c TARGET_PLUGIN=LINUX_SHARED_LIBRARY_YOU_WANT.so
	$ mv dummy.c dummy_APPLICATION_NAME.c
	please add dummy_APPLICATION_NAME.o and related macros to
	Makefile on top directory.

	So you can develop pluginwrapper like acrobat/flash7/realplayer
	support:-).