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Today I had a strange error using the GCC version 4.4.1 with EABI support on a non thumb-ARMv4. Everytime I compiled something, with and w/o the -mno-thumb-interwork parameter it also contained the bx lr instruction which is only for later ARM processors with thumb support. Mehr…

While compiling OpenWrt for an ARM compatible processor I got the following error:

{standard input}: Assembler messages:
{standard input}:39: Error: selected processor does not support `bx r6'

I found the solution in the The definitive guide to GCC book from William Von Hagen (I don’t own it, I found it via Google Books). You have to disable the the USE_BX flag in the uClibc config file and everything will be fine. Mehr…