486b5dfe74
Report an error if a `#[no_mangle]`/`#[export_name = ...]` function has the same symbol name as a built-in shim Implements https://github.com/rust-lang/miri/pull/1776#issuecomment-821322605. The error looks like this: ``` error: found `malloc` symbol definition that clashes with a built-in shim --> tests/compile-fail/function_calls/exported_symbol_shim_clashing.rs:12:9 | 12 | malloc(0); | ^^^^^^^^^ found `malloc` symbol definition that clashes with a built-in shim | help: the `malloc` symbol is defined here --> tests/compile-fail/function_calls/exported_symbol_shim_clashing.rs:2:1 | 2 | / extern "C" fn malloc(_: usize) -> *mut std::ffi::c_void { 3 | | //~^ HELP the `malloc` symbol is defined here 4 | | unreachable!() 5 | | } | |_^ = note: inside `main` at tests/compile-fail/function_calls/exported_symbol_shim_clashing.rs:12:9 ``` This does not implement "better error messages than we do currently for arg/ABI mismatches" in https://github.com/rust-lang/miri/pull/1776#issuecomment-821343175 -- I failed to remove all `check_arg_count()` and `check_abi()` (they are still used in `src/shims/intrinsics.rs` and `call_dlsym()`) and they don't receive the name of the shim. |
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| compile-fail | ||
| run-pass | ||
| compiletest.rs | ||