xgboost build error on CentOS 6.8

I am not familiar with xgboost, however from the error it seems obvious that some ASM code is not getting generated properly:

expecting string instruction after `rep’

The REP keyword prefix in ASM means “repeat this instruction a number of times (defined by the C register)”.

However it could also be a problem with your toolchain. Actually, if the code that generates this error is not relying on inline ASM, it would seem likely that this is a toolchain error.

Some versions of binutils consider rep ret to be invalid, while it is in fact a valid x86-64 instruction.

Try upgrading to binutils

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