Remove the need for out-of-source build trees with non-Unity Ninja builds #171
Description
In a project where I'm using ApprovalTests, and I'm out-of-source builds so that Ninja CI builds should work, I'm finding that the compile-time error check is being triggered...
... I expected this Ninja build to work, because I'm doing out-of-source builds...
It's happened in one project where I'm loading the ApprovalTests.cpp project via CMake's FetchContent - so even though the build tree is outside the source directory, FetchContent is putting ApprovalTests inside the build-tree - which I think is resulting in relative paths...
This is another situation: