tools/[Rust|D]: Fix build break for RISC-V

[no1wudi]

Summary

Rust/D support for RISC-V is broken after #11549,
since the target triple is quite different bewteen Rust/D toolchain and GCC,
only few RISC-V targets are supported by Rust toolchain now, so it's better to
construct target triple in Rust.defs/D.defs for RISC-V.

Impact

Minor

Testing

Local machine

[anchao]

@no1wudi I solved this issue a long time ago, but forgot to submit it... could you fix the similar issue in LDC2(dlang) at the same time?
https://github.com/apache/nuttx/blob/master/tools/D.defs#L50

[no1wudi]

@no1wudi I solved this issue a long time ago, but forgot to submit it... could you fix the similar issue in LDC2(dlang) at the same time? https://github.com/apache/nuttx/blob/master/tools/D.defs#L50

OK

[lupyuen]

Sorry @no1wudi I think CONFIG_ARCH_RV_ISA_F and CONFIG_ARCH_RV_ISA_D don't exist: tools/Rust.defs

  ifeq ($(CONFIG_ARCH_RV_ISA_F),y)
    RUST_ARCHTYPE := $(RUST_ARCHTYPE)f
  endif
  ifeq ($(CONFIG_ARCH_RV_ISA_D),y)
    RUST_ARCHTYPE := $(RUST_ARCHTYPE)d
  endif

In my upcoming PR, I propose to change them to CONFIG_ARCH_FPU and CONFIG_ARCH_DPFPU: tools/Rust.defs

    ifeq ($(CONFIG_ARCH_FPU),y)
      RUST_ARCHTYPE := $(RUST_ARCHTYPE)f
    endif
    ifeq ($(CONFIG_ARCH_DPFPU),y)
      RUST_ARCHTYPE := $(RUST_ARCHTYPE)d
    endif

(This usage of CONFIG_ARCH_FPU and CONFIG_ARCH_DPFPU is consistent with Toolchain.defs)

My PR will also fix the Rust Build riscv64gc for QEMU RISC-V 64-bit. (Which has been broken for a while) I hope you are OK with this. Thanks!

[no1wudi]

@lupyuen Sorry for this issue, let's submit a standalone patch to fix it?

[lupyuen]

@no1wudi Yep I'll submit a patch now for D.defs and Rust.defs. My Dockerfile testing is taking a while, so I'll patch the other files later. Thanks!

[lupyuen]

@no1wudi Here's the patch for D.defs and Rust.defs thanks! #12854