No 'neon' option available in gcc 4.8.5 coming with r28 bsp

It seems that ‘-fmpu=neon’ option for gcc is disabled in the toolchain that could be downloaded from the official website. What’s the purpose of this? Does that mean NEON is not recommended when compiling against Jetson TX2?

NEON as an option is for the 32-bit ARMv7 (armhf). In ARMv8-a 64-bit this is not optional…the hardware is always present. Thus no option in the compiler…the lack of the option is the reverse of not supported…it is a “must be supported and you can’t remove NEON from the hardware”.