Since VS2015 RTM, AppVeyor provides an image that has both VS2015 and
Cygwin pre-installed. Before this change, I had combined the build
matrix into one row, because of the need to install Cygwin in each
build worker, which is a 10-15-minute process. Since this is no longer
necessary, the matrix is restored. AppVeyor builds are now very fast.
Also reordered compilers so that the very first tested are the ones
that support the most configurations, then immediately followed by
those which are the most likely to fail. Typically, this would be the
oldest ones, or the compiler versions that were the first to support
some major features.
Current AppVeyor images with VC2015 don't have Cygwin pre-installed, so
each row in the build matrix installs it before running the build. This
takes about 7-8 minutes per row.
This change combines all the VC testing into one row, so the price of
installing Cygwin is paid only once. A secondary improvement is that
individual rows don't have to wait in the AppVeyor queue. Builds now
take a total of about 15 minutes, instead of approximately an hour,
including queueing time.
This change should probably be undone once there is an AppVeyor image
that comes with both VC2015 and Cygwin. The main AppVeyor image has VC
up to 2013 and Cygwin, so I suppose VC2015 and Cygwin will be available
once a final version of VC2015 is released.
Until then, Better Enums does not have the benefit of separate rows in
the AppVeyor build matrix.
