Last updated on May 7, 2015 by Dan Nanni
cc1: error: unrecognized command line option '-mavx2'How can I fix this error?
The error indicates that the GCC compiler you are using does not support -mavx2
option. This option is supposed to enable the use of AVX2 extended instruction sets in the code that you are compiling the program into. As extensions to the x86 instruction set, AVX/AVX2 is designed to improve the performance and parallelism of floating-point intensive computations.
The mavx2
option is supported by GCC version 4.7 and higher. Check your GCC version:
$ gcc --version
Most likely the GCC compiler installed on your CentOS is too old to support mavx2
option.
For example, CentOS 6.X comes with GCC version 4.4.7. If you want to upgrade GCC to versioin 4.7 on CentOS 6.X, you can install devtools
. Refer to this guideline to upgrade GCC on CentOS.
Another option is to upgrade to CentOS 7 which comes with GCC 4.8.
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