Still cannot build project with 'panic = abort'

[alexbool]

This time compiler plugins seem to be the culprit

alexbool@alexbool-osx ~/D/I/nounwind> cat Cargo.toml 
[package]
name = "nounwind"
version = "0.1.0"
authors = ["Alexander Bulaev <alexbool@yandex-team.ru>"]

[dependencies]
quasi_macros = "*"

[profile.release]
panic = "abort"

alexbool@alexbool-osx ~/D/I/nounwind> cat src/main.rs 
extern crate quasi_macros;

fn main() {
}

alexbool@alexbool-osx ~/D/I/nounwind> cargo build --release
    Updating registry `https://github.com/rust-lang/crates.io-index`
   Compiling aster v0.16.0
   Compiling quasi_codegen v0.10.0
   Compiling quasi_macros v0.10.0
error: the linked panic runtime `panic_unwind` is not compiled with this crate's panic strategy `abort`
error: aborting due to previous error
error: Could not compile `quasi_macros`.

To learn more, run the command again with --verbose.

This time adding

[profile.dev]
panic = "abort"

doesn't help

Meta:

alexbool@alexbool-osx ~/D/I/nounwind> rustc -vV
rustc 1.10.0-nightly (57ef01513 2016-05-23)
binary: rustc
commit-hash: 57ef015132ec09345b88d2ec20a9d9809b5d3dfc
commit-date: 2016-05-23
host: x86_64-apple-darwin
release: 1.10.0-nightly
alexbool@alexbool-osx ~/D/I/nounwind> cargo -vV
cargo 0.11.0-nightly (ca743f3 2016-05-23)

[alexcrichton]

Thanks for the report! And yes, hm, indeed, this is a problem!

I'll have to noodle on a way to fix this, unfortunately it probably won't be trivial

[mitsuhiko]

@alexcrichton if it's hard to fix, maybe it's easier to detect that problem and tell the user why it's broken and link to this here. That was surprisingly hard to google for and it wastes quite a bit of time.

[alexcrichton]

Hm let me elaborate on what I'm thinking for this:

• You can't link a crate compiled with panic=abort to a dylib compiled with panic=unwind
• Plugins link to libsyntax/librustc/etc, all of which are compiled with panic=unwind
• As a result, all plugin crates must be compiled with panic=unwind
• This gets tricky, because dependencies of plugins must also be compiled with panic=unwind
• It may be the case that a dependency is shared between the main application (panic=abort) and also a plugin (panic=unwind). In this scenario we don't recompile the crate and just call the compiler once.

My idea for a solution here is to just have a "panic" flag which is set for plugins and all of their dependencies, so even though panic=abort is requested all the deps are compiled with panic=unwind. That means you may link unwinding code into the main app if you're not cross compiling, but that should still all link just fine in the end as it's designed for panic=unwind crates to link to panic=abort ones anyway.

@mitsuhiko it's probably not really any harder to fix than it is to detect, so just need to find some time to implement this.

[alexbool]

Any good news on this? Basically it blocks panic=abort if you use nightly compiler with serde plugin, which I believe is a frequent use case

[UserAB1236872]

Seems to still be an issue despite the merge/close:

Cargo.toml:

[package]
name = "panic_test"
version = "0.1.0"

[profile.release]
panic = "abort"

[dependencies]
lodepng = "0.11"

The main.rs is just a Hello World program. It yields the same error (error: the linked panic runtime panic_unwind is not compiled with this crate's panic strategy abort) when compiled with cargo build --release. Additional testing with profiles such as dev yield the same problem.

Fails on both 1.12 stable and nightly (144af3e97 2016-10-02).

[alexcrichton]

@Jragonmiris ah unfortunately that's a bad error message but it's because of crate-type = ["dylib", "rlib"] in the c_vec crate. This causes Cargo to pass -C prefer-dynamic which links to the dylib that we ship which is compiled against panic_unwind, meaning the abort mode is indeed invalid (this error is coming from the compiler).

The fix here would be to remove "dylib" from the c_vec crate.

[AaronFriel]

I have a simple project whose only direct dependency is clap, and it's failing to compile with panic = "abort" because of this issue. I can hardly say more than that this seems the pluggable panic behavior is a flawed feature if users must alter their dependencies, or dependency's dependencies, and so on.

[alexcrichton]

@AaronFriel do you have a Cargo.toml I can reproduce with? A simple one with clap = "*" doesn't reproduce that behavior. Maybe clap changed over time though?

[AaronFriel]

Would it affect anything that I'm building on Windows? Here's my cargo.toml:

[package]
name = "flairs"
version = "0.1.0"
authors = ["Aaron Friel <mayreply@aaronfriel.com>"]

[dependencies]
clap="^2.13.0"

[alexcrichton]

Hm even then I wasn't able to reproduce. Could you gist a full build of rustc -vV, cargo -V, and cargo build -v ?

[AaronFriel]

I have reduced the problem to being unable to cargo bench, cargo build works fine if I add panic = "abort" to the appropriate profile settings.

[AaronFriel]

https://gist.github.com/AaronFriel/ef174187fe8aa7e96560ac6269b32b2b

[alexcrichton]

@AaronFriel ah yeah unfortunately cargo bench with panic="abort" doesn't work today, but that's definitely a bug in Cargo (e.g. cargo test works). Can you open a separate issue about that?

[AaronFriel]

Sure! I created issue #3166

[alexcrichton]

Thanks!