LLVM assert abort while trying to take address of raw pointer in static

[Kimundi]

Testcase:

fn main() {
    unsafe {
        static BLOCK_UNSAFE_SAFE_PTR: &'static int = &*(0xdeadbeef as *int);
    }
}

Output:

rustc: /build/rust-git/src/rust/src/llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::GlobalVariable; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type = llvm::GlobalVariable*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
fish: Job 1, “rustc bug_generic_static_function_ptr.rs ” terminated by signal SIGABRT (Abort)

[Twisol]

/cc @eddyb

[steveklabnik]

Triage:

rustc: /home/steve/src/rust/src/llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::GlobalVariable; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type = llvm::GlobalVariable*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.

[emberian]

Confirm.

[JustAPerson]

tl;dr: this bug still reproduces
Updated for current Rust (on playpen as of today, 29 March 2015):

This still fails the llvm assertion that @steveklabnik mentioned.

fn main() {
    unsafe {
        static BLOCK_UNSAFE_SAFE_PTR: &'static isize = &*(0xdeadbeef as *const isize);
    }
}

[tamird]

I am no longer able to reproduce this on rustc 1.0.0-dev (f46c4e158 2015-04-20) (built 2015-04-20)

[jooert]

This still fails (when LLVM assertions are enabled) with

rustc: /path/to/rust/src/llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::GlobalVariable; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type = llvm::GlobalVariable*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.

[pmarcelll]

This fails with a regular build error on the latest nightly:

test.rs:3:57: 3:86 error: raw pointers cannot be dereferenced in statics [E0396]
test.rs:3         static BLOCK_UNSAFE_SAFE_PTR: &'static isize = &*(0xdeadbeef as *const isize);
                                                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: aborting due to previous error

[alexcrichton]

Agreed!

[emberian]

@alexcrichton is there a test for this? I didn't notice one.

[alexcrichton]

Probably not specifically, but PRs which often fix issues like this tend to have their own test cases anyway.