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Description
With:
[profile.release]
lto = truein my workspace Cargo.toml running cargo fuzz run «target» fails to link with:
= note: rust-lld: error: undefined symbol: __sancov_gen_.327
>>> referenced by «target».d25d56b5730432d9-cgu.0
>>> /home/ianc/Development/cvpn/orga-expressvpn/lightway/target/x86_64-unknown-linux-gnu/release/deps/«target»-3abb84e625a12f1f.«target».d25d56b5730432d9-cgu.0.rcgu.o:(asan.module_dtor.263)
rust-lld: error: undefined symbol: __sancov_gen_.210
>>> referenced by «target».d25d56b5730432d9-cgu.0
>>> /home/ianc/Development/cvpn/orga-expressvpn/lightway/target/x86_64-unknown-linux-gnu/release/deps/«target»-3abb84e625a12f1f.«target».d25d56b5730432d9-cgu.0.rcgu.o:(asan.module_dtor.535)
(there are dozens of these).
Commenting out lto = true results in a successful link and run.
If this isn't an easy fix perhaps cargo fuzz could pass --config profile.release.lto=false to cargo? Alternatively being able to choose a custom profile (not just release vs dev) might be a useful feature in its own right.
Reproduced with
rustc 1.83.0-nightly (9c01301c5 2024-09-05)
and
rustc 1.83.0-nightly (c52c23b6f 2024-09-16)
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