[BUG] Rust Hello example with cargo fails to build

[iamadahn]

Description / Steps to reproduce the issue

I'm trying to build that with latest rust compiler and gives an error:

error: panic_immediate_abort is now a real panic strategy! Enable it with `panic = "immediate-abort"` in Cargo.toml, or with the compiler flags `-Zunstable-opti
ons -Cpanic=immediate-abort`. In both cases, you still need to build core, e.g. with `-Zbuild-std`
  --> /home/adahn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:36:1
   |
36 | / compile_error!(
37 | |     "panic_immediate_abort is now a real panic strategy! \
38 | |     Enable it with `panic = \"immediate-abort\"` in Cargo.toml, \
39 | |     or with the compiler flags `-Zunstable-options -Cpanic=immediate-abort`. \
40 | |     In both cases, you still need to build core, e.g. with `-Zbuild-std`"
41 | | );
   | |_^

On which OS does this issue occur?

[OS: Linux]

What is the version of your OS?

Ubuntu 24.04

NuttX Version

12.12

Issue Architecture

[Arch: x86]

Issue Area

[Area: Examples]

Host information

No response

Verification

• I have verified before submitting the report.

[acassis]

@iamadahn thank you very much for reporting it! @lupyuen any suggestion to help him?

[lupyuen]

Hi @no1wudi: Do we need to update the examples/rust/hello app to support panic_immediate_abort? Here are the 2 files that mention panic_immediate_abort. Thanks!

nuttx-apps/tools/Rust.mk

Lines 78 to 107 in fe546ac

	# Build Rust project using cargo
	#
	# Usage: $(call RUST_CARGO_BUILD,cratename,prefix)
	#
	# Inputs:
	# cratename - Name of the Rust crate (e.g. hello)
	# prefix - Path prefix to the crate (e.g. path/to/project)
	#
	# Output:
	# None, builds the Rust project
	ifeq ($(CONFIG_DEBUG_FULLOPT),y)
	define RUST_CARGO_BUILD
	NUTTX_INCLUDE_DIR=$(TOPDIR)/include:$(TOPDIR)/include/arch \
	cargo build --release -Zbuild-std=std,panic_abort \
	-Zbuild-std-features=panic_immediate_abort \
	--manifest-path $(2)/$(1)/Cargo.toml \
	--target $(call RUST_TARGET_TRIPLE)
	endef
	else
	define RUST_CARGO_BUILD
	@echo "Building Rust code with cargo..."
	NUTTX_INCLUDE_DIR=$(TOPDIR)/include:$(TOPDIR)/include/arch \
	cargo build -Zbuild-std=std,panic_abort \
	--manifest-path $(2)/$(1)/Cargo.toml \
	--target $(call RUST_TARGET_TRIPLE)
	endef
	endif

nuttx-apps/cmake/nuttx_add_rust.cmake

Lines 127 to 136 in fe546ac

	# Determine build profile based on CONFIG_DEBUG_FULLOPT
	if(CONFIG_DEBUG_FULLOPT)
	set(RUST_PROFILE "release")
	set(RUST_DEBUG_FLAGS "-Zbuild-std-features=panic_immediate_abort")
	else()
	set(RUST_PROFILE "debug")
	set(RUST_DEBUG_FLAGS "")
	endif()

[no1wudi]

@lupyuen Yes, this issue was introduced in a recent nightly build. My main concern right now is how to maintain compatibility with previous nightly toolchain, I'll invesitgate it.

[lupyuen]

Thanks @no1wudi! Wonder if NuttX should just drop compatibility with older Rust Toolchains. Rust Compiler is upgraded too often, now is probably the best time to make this Breaking Upgrade (before more devs start using Rust on NuttX) 🤔

[iamadahn]

Thank you for such fast investigation, also please tell me if cargo-based projects are available for other architectures except the one that was stated in the commit descriptions?