As another note on that: I have a test to be run on windows only by using: <build>no <target-os>windows:<build>yes
This now also breaks BJam as it sees a <build>no by the C++11 requirements and a <build>yes by the above :( No idea how to solve that.
This will get ugly here. I have 1 test which must only be build on Windows. ALL tests must only be build in C++11.
Hence I would need to decorate _every_ test with the C++11 requirement but that 1 test where I need to define a function that checks for the C++11 requirement _and_ if it is on Windows.
The requirements specified for the project are applied to all targets in the Jamfile. So you can apply the C++11 requirement to the project and the Windows requirement to that one test. This is what I'm already doing, see above. The problem is that the project-wide C++11 requirement yields <build>no while the windows requirement yields <build>yes which causes a conflict and a hard error in B2:
https://ci.appveyor.com/project/Flamefire/nowide-fr98b/builds/32945388/job/1... The relevant line is this: https://github.com/boostorg/nowide/blob/755dbe5255211677eebbe0a3795e44b1afb3...