How to check during compilation that GCC has at least C++17 running?

Question

How do I check during compilation that GCC (or any other compiler) has at least C++17 running? Can you give a minimal preprocessor snippet that emits an error if the version is below C++17?

I presume this can be built from __cplusplus and the #error directive.

Number to check has changed, you may print it out to know exactly. — πάντα ῥεῖ, May 26 '21 at 23:32
_I presume this can be built from __cplusplus and the #error directive._ Correct. — Paul Sanders, May 26 '21 at 23:34

score 2 · Accepted Answer · answered May 26 '21 at 23:32

2

#if __cplusplus < 201703L
#error "C++17 or later is required!"
#endif

answered May 26 '21 at 23:32

Remy Lebeau

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Thanks for verifying. I was facing a strange bug. – shuhalo May 27 '21 at 01:08

How to check during compilation that GCC has at least C++17 running?

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