OK, I researched this a bit more... It seems the eabihf ABI is newer, and 
incompatible with eabi.
There has been some recent work in making busybox recognize this and give 
better error messages: 
http://buildroot-busybox.2317881.n4.nabble.com/PATCH-toolchain-check-ARM-EABI-vs-EABIhf-for-external-toolchains-td48596.html

Couldn't find any pre-built gcc 4.8 toolchains :-(

On the other hand, it turns out my code which caused gcc 4.7 to chrash was 
bad, and with 4.8 I got a decent error message instead of a crash. Which 
made it possible to fix the code, so now I don't need 4.8 anymore :-D

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