Flags for Raspberry Pi 3 and Stretch

[benhylau]

One Raspberry Pi 3, since Raspbian Stretch, setting -mfpu CFLAG breaks cjdns compile unless NO_TEST is set. Performance is poor unless -mfpu is set.

See: tomeshnet/prototype-cjdns-pi#85 (comment)

[darkdrgn2k]

Stretch compilation is somewhat broken.

You need to turn off tests and compile with -O2 which helps with performance a bit. The resulting binary performance is about 50% of what it should be.

Using a pre-compiled binary from the orange pi (ie cjdns-neon.deb) returns performance back to expected levels.

The same issue occurs on PI 2 (it has the neon accelerator as well)