Compiler crashes on cyclic initialization

[sakithb]

Context

• Operating System & Odin Version: Ubuntu 24.04, both dev-2025-02-nightly and 66540b7
• Please paste odin report output:

Where to find more information and get into contact when you encounter a bug:

        Website: https://odin-lang.org
        GitHub:  https://github.com/odin-lang/Odin/issues


Useful information to add to a bug report:

        Odin:    dev-2025-03:3ade69f
        OS:      Ubuntu 24.04.2 LTS, Linux 5.15.167.4-microsoft-standard-WSL2
        CPU:     13th Gen Intel(R) Core(TM) i5-1334U
        RAM:     5929 MiB
        Backend: LLVM 18.1.3

Expected Behavior

Compiler error

Current Behavior

The compiler segfaults

Failure Information (for bugs)

From what I understood, the compiler cannot seem to determine the type of the global variable leading the entity.type to be a null pointer.

Removing the @(export) attribute compiles successfully and giving a type b: rawptr = &a fails with a linker a error.

Steps to Reproduce

package main

foreign {
    @(link_name="b")
    _b: rawptr
}

a := &_b

@(export)
b := &a

main :: proc() {
}

1. Compile the above program
2. Crash

Failure Logs

Backtrace

#0  0x0000555555648c0d in is_type_bit_set (t=0x0) at src/types.cpp:1737
#1  0x00005555556476e9 in signature_parameter_similar_enough (x=0x0, y=0x5555558e7470 <basic_types+4800>) at src/check_decl.cpp:701
#2  0x00005555556416f3 in check_global_variable_decl (ctx=0x7fffffffc880, e=@0x7fffffffc990: 0x7fffd67fe210, type_expr=0x0,
    init_expr=0x7fffe6dd2b70) at src/check_decl.cpp:1491
#3  0x0000555555640ce4 in check_entity_decl (ctx=0x7fffe6fa00d0, e=0x7fffd67fe210, d=0x7fffd67fe3b0, named_type=0x0)
    at src/check_decl.cpp:1695
#4  0x00005555556409e6 in check_single_global_entity (c=0x7fffe6dcfc20, e=0x7fffd67fe210, d=0x7fffd67fe3b0) at src/checker.cpp:4650
#5  0x0000555555611ae6 in check_all_global_entities (c=0x7fffe6dcfc20) at src/checker.cpp:4665
#6  0x000055555559c2ca in check_parsed_files (c=0x7fffe6dcfc20) at src/checker.cpp:6573
#7  0x00005555555854f2 in main (arg_count=4, arg_ptr=0x7fffffffe2d8) at src/main.cpp:3567