Boost\libs\numeric\ublas failed to build due to error C2059, C2065, C2923, C2976, C2447 .... on MSVC about ublas

[amitsingh19975]

If you are trying to use Tensor, the minimum C++ standard is 20. Furthermore, for windows, the msvc >= 14.29. If it doesn't work, please post the msvc version.

[Zhaojun-Liu]

Hi @amitsingh19975,
I tried option /std:c++latest, the error still exists. And the msvc version as below:

[amitsingh19975]

Are you using b2 for compiling? If yes, try passing c++ standard cxxstd=latest like this. If the problem persists, send me the command you use to compile. Try to use GCC on windows to check if the same problem occurs. If it does, you are doing something wrong while compiling, like using b2 incorrectly.

[Zhaojun-Liu]

I try to update the build steps as follows:

1. .\bootstrap
2. .\b2 headers variant=release cxxstd=latest --build-dir=..\out\x86rel address-model=32
3. .\b2 variant=release cxxstd=latest --build-dir=..\out\x86rel address-model=32
   and then runtest as below
   .\b2 -j16 variant=release cxxstd=latest --build-dir=..\out\x86rel libs\numeric\ublas\test

and the issue persists.

[amitsingh19975]

Try to follow the steps in the following yml file https://github.com/boostorg/ublas/blob/develop/.github/workflows/windows.yml.

[Zhaojun-Liu]

I compared the difference between our compilation steps and the yml file you provided, and after executing different parts, the error can still be reproduced.