try compiling with different methods, no success

subxt/examples/setup_config_custom.rs

@@ -2,7 +2,7 @@
 use codec::Encode;
 use subxt::client::OfflineClientT;
 use subxt::config::{Config, ExtrinsicParams, ExtrinsicParamsEncoder};
-use subxt_core::error::ExtrinsicParamsError;
+use subxt_core::ExtrinsicParamsError;
 use subxt_signer::sr25519::dev;
 
 #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_full.scale")]

subxt/examples/setup_config_signed_extension.rs

@@ -7,7 +7,7 @@ use subxt::config::{
     Config, DefaultExtrinsicParamsBuilder, ExtrinsicParams, ExtrinsicParamsEncoder,
 };
 use subxt_core::config::signed_extensions;
-use subxt_core::error::ExtrinsicParamsError;
+use subxt_core::ExtrinsicParamsError;
 use subxt_signer::sr25519::dev;
 
 #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]

testing/no-std-tests/Cargo.lock

@@ -167,9 +167,9 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.1.1"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e89b8c6a2e4b1f45971ad09761aafb85514a84744b67a95e32c3cc1352d1f65c"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -277,9 +277,9 @@ checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
 [[package]]
 name = "fiat-crypto"
-version = "0.2.5"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27573eac26f4dd11e2b1916c3fe1baa56407c83c71a773a8ba17ec0bca03b6b7"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "fixed-hash"

testing/no-std-tests/Cargo.toml

@@ -7,8 +7,8 @@ resolver = "2"
 
 [dependencies]
 subxt-metadata = { path = "../../metadata", default-features = false }
-subxt-core = { path = "../../core", default-features = false }
 subxt-signer = { path = "../../signer", default-features = false, features = ["sr25519", "ecdsa", "subxt"] }
+subxt-core = { path = "../../core", default-features = false }
 codec = { package = "parity-scale-codec", version = "3.6.9", default-features = false, features = ["derive"] }
 libc = { version = "0.2", default-features = false }
 libc_alloc = { version = "1.0.6" }

testing/no-std-tests/README.md

@@ -0,0 +1,11 @@
+# no_std tests
+
+This crate makes sure some of the subxt-* crates work in a no-std environment.
+
+We would like it to run in a no-std environment. You can try any of the following to get it to compile:
+```
+cargo run 
+cargo build --target thumbv7em-none-eabi 
+cargo build --target aarch64-unknown-none
+```
+Currently it does not compile due to linker errors and I have no idea how to resovle these. 

testing/no-std-tests/src/main.rs

@@ -9,7 +9,7 @@
 
 #[start]
 fn start(_argc: isize, _argv: *const *const u8) -> isize {
-    compile_test();
+    test();
     0
 }
 
@@ -19,7 +19,9 @@ pub extern "C" fn rust_eh_personality() {}
 
 #[panic_handler]
 fn panic(_info: &core::panic::PanicInfo) -> ! {
-    loop {}
+    unsafe {
+        libc::abort();
+    }
 }
 
 use libc_alloc::LibcAlloc;
@@ -33,27 +35,30 @@ extern crate alloc;
 
 /// Including code here makes sure it is not pruned.
 /// We want all code included to compile fine for the `thumbv7em-none-eabi` target.
-fn compile_test() {
-    subxt_metadata_compiles();
-}
+fn test() {
+    // /////////////////////////////////////////////////////////////////////////////
+    // subxt-metadata
+    // /////////////////////////////////////////////////////////////////////////////
 
-fn subxt_metadata_compiles() {
     use codec::Decode;
     let bytes: alloc::vec::Vec<u8> = alloc::vec![0, 1, 2, 3, 4];
     subxt_metadata::Metadata::decode(&mut &bytes[..]).expect_err("invalid byte sequence");
 
     const METADATA: &[u8] = include_bytes!("../../../artifacts/polkadot_metadata_small.scale");
     subxt_metadata::Metadata::decode(&mut &METADATA[..]).expect("should be valid metadata");
-}
 
-fn subxt_signer_test() {
-    use subxt_signer::{ SecretUri, ecdsa::Keypair };
+    // /////////////////////////////////////////////////////////////////////////////
+    // subxt-signer
+    // /////////////////////////////////////////////////////////////////////////////
+
     use core::str::FromStr;
+    use subxt_signer::{ecdsa::Keypair, SecretUri};
     let uri = SecretUri::from_str("//Alice").unwrap();
-    let keypair = Keypair::from_uri(&uri).unwrap();
-}
+    let _keypair = Keypair::from_uri(&uri).unwrap();
 
-fn subxt_core_test() {
-    let _ = subxt_core::utils::Era::Immortal;
-}
+    // /////////////////////////////////////////////////////////////////////////////
+    // subxt-core
+    // /////////////////////////////////////////////////////////////////////////////
 
+    let _era = subxt_core::utils::Era::Immortal;
+}