Issue with Linux (Ubuntu 16.04) install of Itensor V3

Question

I previously had no issue installing V2 on my device. However, now when I run 'make', I get the error: "g++: error: unrecognized command line option '-fconcepts' ".

No doubt this is an issue with the compiler flag in the line
" CCCOM=g++ -m64 -std=c++17 -fconcepts -fPIC "
of the options.mk file. As a test, I tried removing the flag, but the compile again failed.

My best guess is that this has to do with the compiler and c++17, but I've had little luck with Google.

Any help would be appreciated!

Comments

What version of g++ are you using? You can get the version by typing `g++ --version` at the command line. It may just be an issue of having an older compiler.

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Thank you for responding Matt. You are correct. It seems as though, even though I had the most recent compiler installed, g++ was defaulting to an older version when called. I found that modifying the above line of code to:
"CCCOM=g++-7 -m64 -std=c++17 -fconcepts -fPIC"
resolved the issue. Now everything compiled.

Answer 1

(Answer is in the comments).