Unable to build littflefs under esp-rs

[leelists]

Hi,

I'm trying to setup littlefs2-sys crate but got this weird error on compile (
cargo:rustc-link-lib=static=lfs-sys
cargo:rustc-link-search=native=/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-bfcc464d6158cf54/out

--- stderr
thread 'main' panicked at 'a libclang shared library is not loaded on this thread', /home/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/clang-sys-1.3.1/src/lib.rs:1692:1
stack backtrace:
0: 0x559cb7a3491c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf3852a2e8c0ed474

Any clues ?

Thanks

Reproducer

use littlefs2::fs::Filesystem;

fn main() {
    esp_idf_sys::link_patches();
}

**ESP32-C3 Build **
cargo build --target riscv32imc-esp-espidf
==>

Compiling littlefs2-sys v0.1.6
The following warnings were emitted during compilation:

warning: cc: error: unrecognized argument in option ‘-mabi=ilp32’
warning: cc: note: valid arguments to ‘-mabi=’ are: ms sysv
warning: cc: error: unrecognized argument in option ‘-mcmodel=medany’
warning: cc: note: valid arguments to ‘-mcmodel=’ are: 32 kernel large medium small

error: failed to run custom build command for `littlefs2-sys v0.1.6`

Caused by:
  process didn't exit successfully: `/home/rust/rust-esp32-std-demo/target/release/build/littlefs2-sys-1d6dbaa83e9b0ae9/build-script-build` (exit status: 1)
  --- stdout
  TARGET = Some("riscv32imc-esp-espidf")
  OPT_LEVEL = Some("s")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_riscv32imc-esp-espidf = None
  CC_riscv32imc_esp_espidf = None
  TARGET_CC = None
  CC = None
  CROSS_COMPILE = None
  CFLAGS_riscv32imc-esp-espidf = None
  CFLAGS_riscv32imc_esp_espidf = None
  TARGET_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("false")
  CARGO_CFG_TARGET_FEATURE = Some("c,llvm14-builtins-abi,m")
  running: "cc" "-Os" "-ffunction-sections" "-fdata-sections" "-fPIC" "-march=rv32imc" "-mabi=ilp32" "-mcmodel=medany" "-Wall" "-Wextra" "-std=c11" "-DLFS_NO_MALLOC" "-DLFS_NO_DEBUG" "-DLFS_NO_WARN" "-DLFS_NO_ERROR" "-DLFS_NO_ASSERT" "-o" "/home/rust/rust-esp32-std-demo/target/riscv32imc-esp-espidf/release/build/littlefs2-sys-e759feb3b1f171d7/out/littlefs/lfs.o" "-c" "littlefs/lfs.c"
  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 ‘-mcmodel=medany’
  cargo:warning=cc: note: valid arguments to ‘-mcmodel=’ are: 32 kernel large medium small
  exit status: 1

ESP32 Build ==>

Caused by:
  process didn't exit successfully: `/home/rust/rust-esp32-std-demo/target/debug/build/littlefs2-sys-c58b6439135e84ff/build-script-build` (exit status: 101)
  --- stdout
  TARGET = Some("xtensa-esp32-espidf")
  OPT_LEVEL = Some("z")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_xtensa-esp32-espidf = None
  CC_xtensa_esp32_espidf = None
  TARGET_CC = None
  CC = None
  CROSS_COMPILE = None
  CFLAGS_xtensa-esp32-espidf = None
  CFLAGS_xtensa_esp32_espidf = None
  TARGET_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("true")
  CARGO_CFG_TARGET_FEATURE = Some("atomctl,bool,coprocessor,debug,dfpaccel,div32,exception,fp,highpriinterrupts,interrupt,llvm14-builtins-abi,loop,mac16,memctl,miscsr,mul32,mul32high,nsa,prid,regprotect,rvector,s32c1i,sext,threadptr,timerint,windowed")
  running: "cc" "-Os" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-Wall" "-Wextra" "-std=c11" "-DLFS_NO_MALLOC" "-DLFS_NO_DEBUG" "-DLFS_NO_WARN" "-DLFS_NO_ERROR" "-DLFS_NO_ASSERT" "-o" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/littlefs/lfs.o" "-c" "littlefs/lfs.c"
  exit status: 0
  running: "cc" "-Os" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-Wall" "-Wextra" "-std=c11" "-DLFS_NO_MALLOC" "-DLFS_NO_DEBUG" "-DLFS_NO_WARN" "-DLFS_NO_ERROR" "-DLFS_NO_ASSERT" "-o" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/littlefs/lfs_util.o" "-c" "littlefs/lfs_util.c"
  exit status: 0
  running: "cc" "-Os" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-Wall" "-Wextra" "-std=c11" "-DLFS_NO_MALLOC" "-DLFS_NO_DEBUG" "-DLFS_NO_WARN" "-DLFS_NO_ERROR" "-DLFS_NO_ASSERT" "-o" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/string.o" "-c" "string.c"
  exit status: 0
  AR_xtensa-esp32-espidf = None
  AR_xtensa_esp32_espidf = None
  TARGET_AR = None
  AR = None
  running: "ar" "cq" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/liblfs-sys.a" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/littlefs/lfs.o" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/littlefs/lfs_util.o" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/string.o"
  exit status: 0
  running: "ar" "s" "/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out/liblfs-sys.a"
  exit status: 0
  cargo:rustc-link-lib=static=lfs-sys
  cargo:rustc-link-search=native=/home/rust/rust-esp32-std-demo/target/xtensa-esp32-espidf/debug/build/littlefs2-sys-6a1b6e15fa15c0ed/out

  --- stderr
  thread 'main' panicked at 'a `libclang` shared library is not loaded on this thread', /home/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/clang-sys-1.3.2/src/lib.rs:1692:1

[nickray]

I have no idea unfortunately - zero experience with this platform.

[domtac]

Hey @leelists,

my answer might be a little late, but maybe it still helps you, or others encountering this ;)

Assuming you are on linux, you could just install libclang to build your littles:

$ sudo apt install libclang-dev

This fixed part of my problems.