tree f07dd39a0c5f09c030e34d01ecc67c8cef8058fd
parent 5e45e93517378e95ca75eb97726c3db964c644e6
author Cheng XU <git@xuc.me> 1596246506 +0000
committer Cheng XU <git@xuc.me> 1596246506 +0000

Fix switchless sample code

In order to use the switchless feature of the SGX, the app binary needs
to be linked with the following flags.

```
-Wl,--whole-archive -lsgx_uswitchless -Wl,--no-whole-archive
````

Noted that there is currently no proper way to pass custom link flags to
all the binaries in a cargo project. As such, the `link_args` macro need
to be set for each of Rust files with `main` methods.

References:

* Build flags used in Intel SGX sample code: https://github.com/intel/linux-sgx/blob/ce4a18d9a0963b14f717cc7462241cfadd233f55/SampleCode/Switchless/Makefile#L104
* Rust tracking issue on `link_args`: https://github.com/rust-lang/rust/issues/29596
* PR for `cargo:rustc-link-arg-bins` in cargo build script: https://github.com/rust-lang/cargo/pull/8441