Is there a way to run linux binaries on macOS and Windows with qemu-user? As far as I can tell it only runs on Linux (and I guess BSD). Performance considerations are nice, but I think the most interesting thing about Blink is the promise of running small linux binaries on these other platforms.
No, it would be easy to do on Darwin but only if you were willing to trade off emulation accuracy and QEMU wants to be able to run any Linux program.
Even if you remain in the Unix world (so macOS but not Windows), system-call–level translation will let some of the differences between operating systems transpire to the program; and it will cause failures if a program has #ifdefs to distinguish between Linux and Darwin but then sees Darwin behavior under Linux.
On Windows, you would basically be reimplementing cygwin—imagine what a mess it would be for a Linux program to see Windows paths with drives and backslashes.
Even though blink can run any Linux program in principle, the main idea is to use it for the author's "cosmopolitan libc", to run programs that are essentially scripts compiled to machine code. So you'd write these programs portably but still be able to ship a single binary.
