Support ESP32

[kr-work]

Hi, I'm struggling compiling this crate(version 0.9.0) with ESP32.
I'm new to Rust and could not determine if it is still possible in its current state.
If you haven't already, it would be very helpful to have an environment where r2r can be used with ESP32.

error[E0433]: failed to resolve: could not find Access in rfs
--> /home/ryou/.cargo/registry/src/index.crates.io-6f17d22bba15001f/which-4.4.2/src/checker.rs:17:32
|
17 | rfs::access(path, rfs::Access::EXEC_OK).is_ok()
| ^^^^^^ could not find Access in rfs

error[E0425]: cannot find function access in module rfs
--> /home/ryou/.cargo/registry/src/index.crates.io-6f17d22bba15001f/which-4.4.2/src/checker.rs:17:14
|
17 | rfs::access(path, rfs::Access::EXEC_OK).is_ok()
| ^^^^^^ not found in rfs

Some errors have detailed explanations: E0425, E0433.
For more information about an error, try rustc --explain E0425.
error: could not compile which (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
error[E0425]: cannot find value X_OK in crate libc
--> /home/ryou/.cargo/registry/src/index.crates.io-6f17d22bba15001f/clang-sys-1.8.1/src/support.rs:165:51
|
165 | unsafe { Ok(libc::access(path.as_ptr(), libc::X_OK) == 0) }
| ^^^^ not found in libc

error: failed to run custom build command for r2r_actions v0.9.0

Caused by:
process didn't exit successfully: /home/ryou/Documents/r2r-test/target/debug/build/r2r_actions-4f9d2b344ad7888a/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-env-changed=AMENT_PREFIX_PATH
cargo:rerun-if-env-changed=CMAKE_PREFIX_PATH
cargo:rerun-if-env-changed=CMAKE_IDL_PACKAGES
cargo:rerun-if-env-changed=IDL_PACKAGE_FILTER
cargo:rerun-if-env-changed=ROS_DISTRO
cargo:rustc-cfg=r2r__ros__distro__humble

--- stderr
Generate bindings file '/home/ryou/Documents/r2r-test/target/xtensa-esp32-espidf/debug/build/r2r_actions-cbb5d70140a9f74d/out/a0d63c11f6aab0746704a41f6145a7033ff3fb816a6b30e5a5acf48d70935a1a/action_bindings.rs'
error: unknown target triple 'xtensa-esp32-espidf', please use -triple or -arch
thread 'main' panicked at /home/ryou/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bindgen-0.63.0/ir/context.rs:530:15:
libclang error; possible causes include:

• Invalid flag syntax
• Unrecognized flags
• Invalid flag arguments
• File I/O errors
• Host vs. target architecture mismatch
  If you encounter an error missing from this list, please file an issue or a PR!
  note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
  error: failed to run custom build command for r2r_rcl v0.9.0

Caused by:
process didn't exit successfully: /home/ryou/Documents/r2r-test/target/debug/build/r2r_rcl-48fcbd6ba27cfb8a/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-env-changed=AMENT_PREFIX_PATH
cargo:rerun-if-env-changed=CMAKE_PREFIX_PATH
cargo:rerun-if-env-changed=CMAKE_IDL_PACKAGES
cargo:rerun-if-env-changed=IDL_PACKAGE_FILTER
cargo:rerun-if-env-changed=ROS_DISTRO
cargo:rustc-cfg=r2r__ros__distro__humble

--- stderr
Generate bindings file '/home/ryou/Documents/r2r-test/target/xtensa-esp32-espidf/debug/build/r2r_rcl-746b399480a015bd/out/a0d63c11f6aab0746704a41f6145a7033ff3fb816a6b30e5a5acf48d70935a1a/rcl_bindings.rs'
error: unknown target triple 'xtensa-esp32-espidf', please use -triple or -arch
thread 'main' panicked at /home/ryou/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bindgen-0.63.0/ir/context.rs:530:15:
libclang error; possible causes include:

• Invalid flag syntax
• Unrecognized flags
• Invalid flag arguments
• File I/O errors
• Host vs. target architecture mismatch
  If you encounter an error missing from this list, please file an issue or a PR!
  note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
  error: failed to run custom build command for r2r_msg_gen v0.9.0

Caused by:
process didn't exit successfully: /home/ryou/Documents/r2r-test/target/debug/build/r2r_msg_gen-ab6e3a62d4fa7cf4/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-env-changed=AMENT_PREFIX_PATH
cargo:rerun-if-env-changed=CMAKE_PREFIX_PATH
cargo:rerun-if-env-changed=CMAKE_IDL_PACKAGES
cargo:rerun-if-env-changed=IDL_PACKAGE_FILTER
cargo:rerun-if-env-changed=ROS_DISTRO
cargo:rustc-cfg=r2r__ros__distro__humble

--- stderr
Generate bindings in '/home/ryou/Documents/r2r-test/target/xtensa-esp32-espidf/debug/build/r2r_msg_gen-5d2130f729d84370/out/a0d63c11f6aab0746704a41f6145a7033ff3fb816a6b30e5a5acf48d70935a1a'
error: unknown target triple 'xtensa-esp32-espidf', please use -triple or -arch
thread '' panicked at /home/ryou/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bindgen-0.63.0/ir/context.rs:530:15:
libclang error; possible causes include:

• Invalid flag syntax
• Unrecognized flags
• Invalid flag arguments
• File I/O errors
• Host vs. target architecture mismatch
  If you encounter an error missing from this list, please file an issue or a PR!
  note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
  For more information about this error, try rustc --explain E0425.
  error: could not compile clang-sys (lib) due to 1 previous error

[m-dahl]

Hi,

Sorry I don't think it is possible, since we link against the ROS version installed on your computer. So we need shared libraries, we use the file system etc.