Error when building contract with XCM. #1
Description
I'm trying to implement this xcm chain extension so we can put a simple contract that sends a XCM call.
The problem i'm facing is when i try to compile the contract with the given Cargo.toml, i get the following errors:
➜ ink git:(master) ✗ cargo +nightly contract build
....
error: the `#[global_allocator]` in ink_allocator conflicts with global allocator in: sp_io
error: duplicate lang item in crate `sp_io` (which `sp_application_crypto` depends on): `panic_impl`.
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= note: the lang item is first defined in crate `ink_env` (which `flipper` depends on)
= note: first definition in `ink_env` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libink_env-0acca4fc7a95b368.rlib
= note: second definition in `sp_io` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rlib, /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rmeta
error: duplicate lang item in crate `sp_io` (which `sp_application_crypto` depends on): `oom`.
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= note: the lang item is first defined in crate `ink_allocator` (which `ink_env` depends on)
= note: first definition in `ink_allocator` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libink_allocator-f7c621310e573610.rlib, /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libink_allocator-f7c621310e573610.rmeta
= note: second definition in `sp_io` loaded from /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rlib, /Users/hectorb/blockchain/pallet-contracts-xcm/ink/target/ink/wasm32-unknown-unknown/release/deps/libsp_io-7276ad9650247190.rmeta
error: could not compile `extension-xcm` due to 3 previous errors
Is there anything i'm not taking into account when building the contract? I have tried with many variants adding the xcm crate dependency from a new project using cargo contract new ..., but the error is the same.
Also it would be nice to know if there is there any working example of this extension where i can take references?
Thanks!