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When enabled, the weak-intrinsics feature will cause all intrinsics functions to be marked with weak linkage (i.e. `#[linkage = "weak"]) so that they can be replaced at link time by a stronger symbol. This can be set to use C++ intrinsics from the compiler-rt library, as it will avoid Rust's implementation replacing the compiler-rt implementation as long as the compiler-rt symbols are linked as strong symbols. Typically this requires the compiler-rt library to be explicitly specified in the link command. Addresses https://github.com/rust-lang/compiler-builtins/issues/525. Without weak-intrinsics, from nm: ``` 00000000 W __aeabi_memclr8 // Is explicitly weak 00000000 T __udivsi3 // Is not. ``` With weak-intrinsics, from nm: ``` 00000000 W __aeabi_memclr8 // Is explicitly weak 00000000 W __udivsi3 // Is weak due to weak-intrinsics ```