Update the Rust compiler

[hegza]

Fixes #9

[hegza]

Fails locally with stderr:

error occurred: Command "cc" "-O3" "-ffunction-sections" "-fdata-sections" "-march=rv32e" "-mabi=ilp32" "-ffunction-sections" "-fdata-sections" "-march=rv32e" "-mabi=ilp32" "-fno-builtin" "-fvisibility=hidden" "-ffreestanding" "-DVISIBILITY_HIDDEN" "-o" "/opt/rust/build/x86_64-unknown-linux-gnu/stage2-std/riscv32e-unknown-none-elf/release/build/compiler_builtins-af805fa89c3c0c02/out/c39a56a0fe31ddcf-absvdi2.o" "-c" "/opt/rust/src/llvm-project/compiler-rt/lib/builtins/absvdi2.c" with args cc did not execute successfully (status code exit status: 1).

stdout:

  TARGET = Some("riscv32e-unknown-none-elf")                                                                                                                                                                   OPT_LEVEL = Some("3")
  HOST = Some("x86_64-unknown-linux-gnu")
  cargo:rerun-if-env-changed=CC_riscv32e-unknown-none-elf
  CC_riscv32e-unknown-none-elf = None
  cargo:rerun-if-env-changed=CC_riscv32e_unknown_none_elf
  CC_riscv32e_unknown_none_elf = Some("cc")
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("false")
  CARGO_CFG_TARGET_FEATURE = Some("e")
  cargo:rerun-if-env-changed=CFLAGS_riscv32e-unknown-none-elf
  CFLAGS_riscv32e-unknown-none-elf = None
  cargo:rerun-if-env-changed=CFLAGS_riscv32e_unknown_none_elf
  CFLAGS_riscv32e_unknown_none_elf = Some("-ffunction-sections -fdata-sections -march=rv32e -mabi=ilp32")                                                                                                      cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("e")
  cargo:rerun-if-env-changed=CFLAGS_riscv32e-unknown-none-elf
  CFLAGS_riscv32e-unknown-none-elf = None
  cargo:rerun-if-env-changed=CFLAGS_riscv32e_unknown_none_elf
  CFLAGS_riscv32e_unknown_none_elf = Some("-ffunction-sections -fdata-sections -march=rv32e -mabi=ilp32")                                                                                                      cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("e")
  cargo:rerun-if-env-changed=CFLAGS_riscv32e-unknown-none-elf
  CFLAGS_riscv32e-unknown-none-elf = None
  cargo:rerun-if-env-changed=CFLAGS_riscv32e_unknown_none_elf
  CFLAGS_riscv32e_unknown_none_elf = Some("-ffunction-sections -fdata-sections -march=rv32e -mabi=ilp32")                                                                                                      cargo:warning=cc: error: unrecognized argument in option ‘-mabi=ilp32’                                                                                                                                       cargo:warning=cc: note: valid arguments to ‘-mabi=’ are: ms sysv                                                                                                                                             cargo:warning=cc: error: unrecognized argument in option ‘-mabi=ilp32’                                                                                                                                       cargo:warning=cc: note: valid arguments to ‘-mabi=’ are: ms sysv

[hegza]

Keeping LLVM as old version does not change the error here. The problem is specific to Rust 1.80.0.