dankrank / libjawt-fix Goto Github PK

You try to run an LWJGL2 app (e.g. Minecraft 1.12 or earlier) with Java 11+ on Linux.

The following error occurs:
	Inconsistency detected by ld.so: dl-lookup.c: 111: check_match: Assertion `version->filename == NULL || ! _dl_name_match_p (version->filename, map)' failed!
Or perhaps this one, if you use a different distro:
	Inconsistency detected by ld.so: dl-lookup.c: 105: check_match: Assertion `version->filename == NULL || ! _dl_name_match_p (version->filename, map)' failed!
(This error message is a prime example of why assert(3) can't replace proper error reporting, btw)

So, what happened?
After a lot of googling and some LD_DEBUG'ing, I ended up here:
https://mail.openjdk.java.net/pipermail/jdk-dev/2020-February/003890.html
https://bugs.openjdk.org/browse/JDK-8200178

In Java 11 they decided to remove mapfiles, and replace them with visibility attributes.
However, mapfiles also specify symbol versioning, and they just ignored that aspect of it.
The result is that the ABI was broken for literally no reason.
In this particular case, the JAWT_GetAWT@@SUNWprivate_1.1 symbol became JAWT_GetAWT.

So, how to fix it? There are quite a few options:
- install java 8
- build your own java 11+ with a custom patch
- build your own lwjgl 2 natives (liblwjgl64.so) and link to java 11+
- somehow patch one of the shared objects to match the other
- build your own dynamic linker with a special case for this symbol
- use the LD_PRELOAD hack contained in this repo

Build:
	$ make
Use:
	$ LD_PRELOAD=path/to/jawtfix.so java <args>