My experimental branch has been dormant for a long time, but building the
targets serially [2] has overcome my main objection - simplicity [3]. I
merged the current mxe/master recently, and it works well for packages that
are cross-compile aware (e.g. qt). Current i686-pc-mingw32 builds are the
same as mxe/master.
Was it already possible to build a 64 bit toolchain and now it is only
possible to build all toolchains at once?
In the experimental branch, yes and no. You define the targets by `make
MXE_TARGETS=…` or by configuration of the local settings.mk
When yes, what must I do to compile a 64 bit toolchain from the current
master/stable branch?
There isn't a way from current master/stable (without a lot of work). Clone
the experimental brach [4] and play around with it. The toolchain is
stable, but we need feedback on the infrastructure and any help with 64-bit
package patches is welcome.