how to compile proc-macro with address sanitizer

[0xalpharush]

The unstable book suggest compiling a crate that uses proc-macro's with address sanitizer is possible:

rust/src/doc/unstable-book/src/compiler-flags/sanitizer.md

Lines 896 to 897 in 0a39445

	Use of sanitizers together with build scripts and procedural macros is
	technically possible, but in almost all cases it would be best avoided. This

But issues like rust-lang/cargo#10666 and the cross-referenced ones run into linker issues and the "fix" was adding --target so the proc-macro wasn't compiled with ASAN.

While a better error would be nice, I am wondering how to resolve linking errors and compile all code under ASAN. I suspect that not doing so is causing a false positive in ASAN when its memory tracking isn't in the proc-macro as well, but maybe my suspicion is misplaced.

[0xalpharush]

I think I misunderstood the comment and the code generated by proc-macros is still instrumented

[workingjubilee]

Yes, a proc macro being instrumented would only be useful to you if you want rustc to be instrumented.