maemo.org - Talk - View Single Post - Development waiting for PR1.2, anyone else?

	javispedro	2010-04-21 , 22:09
	Posts: 2,355 \| Thanked: 5,249 times \| Joined on Jan 2009 @ Barcelona	#20

Originally Posted by fatalsaint

The way libraries are in Linux is you'll usually have libraryname.so.1.2 < version.. and then a symlink from that to libraryname.so - That way the program just calls libraryname.so and you get whatever version is on the system. If you *need* an older version, you can re-link the libraryname.so to the older one and not the newer one to launch the app. But this is ugly.

It works more like (not that you said it wrong, I just think you might typoed on the first sentence at least):
You install libstuff.so.1.2, and create a libstuff.so -> libstuff.so.1.2 symlink
You build application A on your system. It gets linked to "libstuff.so" which happens to be libstuff.so.1.2, and this latter name is the one the A binary "links with".
You install libstuff.so.1.3, you change the libstuff.so symlink -> libstuff.so.1.3.
You build application B, tries to link with "libstuff.so" which is "libstuff.so.1.3".
You try to run A. It uses libstuff.so.1.2, you still have it installed: no problem.
You try to run B. It uses libstuff.so.1.3: no problem.

This is how it theoretically should work.

But it doesn't matter since here we're talking about Python _and_ Debian packaging mostly.

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