Eigen "'__CUDACC_VER__' is not defined" warning

Question

I get the below compiler warning in Visual Studio C++ Community 2015 with Eigen linear algebra library version 3.3.2. Any ideas why this could be happening, or what I should be checking?

eigen\src/Core/util/Macros.h(815): warning C4668: 'CUDACC_VER' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'

It is best to share the code. Looks like you have some issues with you code. — Mahendra Gunawardena, Feb 20 '17 at 02:22
Fixed https://bitbucket.org/eigen/eigen/commits/ec1a83756f00/ — ggael, Feb 20 '17 at 07:18

score 0 · Answer 1 · edited May 23 '17 at 12:34

If you look up the warning you will see that

#if SOME_NAME

will cause a warning if SOME_NAME is not defined. The replacing with '0' for '#if/#elif actually is the desired behavior. You can get rid of the warning by changing the code to defined(__CUDACC_VER__)

Note: You received this warning because you have a high (/W4 or /Wall) in your project. While this is usually a good thing, often with VS it kinda defeats the purpose (signal to noise ratio being too low).

Eigen "'__CUDACC_VER__' is not defined" warning

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