Hello, when I'm executing the Minecraft Launcher on Gentoo Linux it creates an empty '~/.minecraft/launcher_log.txt' file and immediately crashes without providing any error.

GNU gdb doesn't provide any useful information - the Launcher simply dies with -1 (code 0377):

??$ gdb ./minecraft-launcher ??
GNU gdb (Gentoo 8.3 vanilla) 8.3
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Reading symbols from ./minecraft-launcher...
(No debugging symbols found in ./minecraft-launcher)
(gdb) run
??Starting program: /home/hekarath/minecraft-launcher/minecraft-launcher ??
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[Inferior 1 (process 19856) exited with code 0377]
(gdb)

Previous Java version of Launcher was working fine for me.