MSVC compiler flags incorrect in CI?

Beman Infra
1 

C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1444~1.352\bin\Hostx64\x64\cl.exe /nologo /TP -ID:\a\take_before\take_before\include /DWIN32 /D_WINDOWS /EHsc /EHsc /permissive- /fsanitize=address /Zi /Zi /Ob0 /Od /RTC1 -std:c++20 -MDd /showIncludes /Foexamples\CMakeFiles\take_before_direct_usage.dir\take_before_direct_usage.cpp.obj /Fdexamples\CMakeFiles\take_before_direct_usage.dir\ /FS -c D:\a\take_before\take_before\examples\take_before_direct_usage.cpp

I’m seeing the above come out of a preset test from the newly minted take_before library. The -std:c++20 I think should be /std:c++20. The test is failing btw bc the compiler isn’t in 20 mode. As far as I can tell this is all preset generated. Does anyone know how this works?

2

So we got it working, but I still thought the CI output was weird. What I was missing is that the flag was -std:c++20 and not a = – MSVC does accept that form of the flag. The actual issue was that MSVC doesn’t set the c++20 feature test macro.

tldr: nevermind :slight_smile: