GCC supports quite a few more architectures than llvm. Kernels for these archs would not be able to use Rust in the current state. So, this will limit rust to

GCC supports quite a few more architectures than llvm. Kernels for these archs would not be able to use Rust in the current state. So, this will limit rust to platform specific drivers until either llvm is at parity for gcc for archs that linux is available on, or gcc's rust front-end is fully capable of compiling any rust code in the kernel. In addition to the large maintenance effort for llvm to support so many additional back-ends, there is a non-negligible number of folks who would be very opposed to being forced to use a non-gpl compliler to build a gpl kernel. https://en.wikipedia.org/wiki/GNU_Compiler_Collection#Architectures https://en.wikipedia.org/wiki/GNU_Compiler_Collection#Archit... https://en.wikipedia.org/wiki/LLVM#Back_ends https://en.wikipedia.org/wiki/LLVM#Back_ends https://en.wikipedia.org/wiki/List_of_Linux-supported_computer_architectures#Releases https://en.wikipedia.org/wiki/List_of_Linux-supported_comput...