void TARGET_RUST_CPU_INFO (void) ¶Declare all environmental CPU info and features relating to the target CPU
using the function rust_add_target_info, which takes a string
representing the feature key and a string representing the feature value.
Configuration pairs predefined by this hook apply to all files that are being
compiled.
void TARGET_RUST_OS_INFO (void) ¶Similar to TARGET_RUST_CPU_INFO, but is used for configuration info
relating to the target operating system.