Freshly compiled Zig crashes on macOS

[tritao]

Zig is crashing with stack trace below when running ./zig after compilation.

Compile commands:

(applied workaround from #5092)

cmake .. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_PREFIX_PATH=$(brew --prefix llvm) -GNinja -
DZIG_WORKAROUND_4799=1 && ninja

Stack trace via LLDB:

(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00007fff4fa73e3e libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff4fbb2150 libsystem_pthread.dylib`pthread_kill + 333
    frame #2: 0x00007fff4f9d0312 libsystem_c.dylib`abort + 127
    frame #3: 0x000000010015e759 zig`std.os.abort at os.zig:213:17
    frame #4: 0x000000010014cdf0 zig`std.debug.panicExtra(trace=0x0000000000000000, first_trace_addr=<unavailable>, args=<unavailable>) at debug.zig:302:13
    frame #5: 0x000000010014bc3b zig`std.builtin.default_panic(msg=<unavailable>, error_return_trace=0x0000000000000000) at builtin.zig:548:33
    frame #6: 0x000000010014bc69 zig`std.debug.assert(ok=false) at debug.zig:228:14
    frame #7: 0x000000010021027c zig`std.debug.ModuleDebugInfo.getSymbolAtAddress(self=0x0000000106f7d018, address=0) at debug.zig:1415:19
    frame #8: 0x000000010020f147 zig`std.debug.printSourceAtAddress(debug_info=0x0000000105172ee0, out_stream=0x0000000105172ed8, address=0, tty_config=escape_codes) at debug.zig:578:54
    frame #9: 0x00000001001d1d72 zig`std.debug.writeCurrentStackTrace(out_stream=0x0000000105172ed8, debug_info=0x0000000105172ee0, tty_config=escape_codes, start_addr=<unavailable>) at debug.zig:402:33
    frame #10: 0x000000010015ec25 zig`std.debug.dumpCurrentStackTrace(start_addr=(val = 4296738909, maybe = true)) at debug.zig:124:27
    frame #11: 0x000000010014cd54 zig`std.debug.panicExtra(trace=0x0000000000000000, first_trace_addr=(val = 4296738909, maybe = true), args=std.builtin.struct:548:79 @ 0x00007ffeefbfca88) at debug.zig:274:38
    frame #12: 0x000000010014bc3b zig`std.builtin.default_panic(msg=<unavailable>, error_return_trace=0x0000000000000000) at builtin.zig:548:33
    frame #13: 0x00000001001b085d zig`std.zig.system.NativeTargetInfo.detect(allocator=0x0000000104fe19c8, cross_target=std.zig.cross_target.CrossTarget @ 0x00007ffeefbfdfc0) at system.zig:275:46
    frame #14: 0x000000010017ccaf zig`crossTargetToTarget(cross_target=std.zig.cross_target.CrossTarget @ 0x00007ffeefbfdfc0, dynamic_linker_ptr=0x00007ffeefbfdd38) at stage2.zig:1208:58
    frame #15: 0x00000001001bdbe3 zig`Stage2Target.fromTarget(self=0x00007ffeefbfeed8, cross_target=std.zig.cross_target.CrossTarget @ 0x00007ffeefbfdfc0) at stage2.zig:947:47
    frame #16: 0x00000001001562f5 zig`stage2TargetParse(stage1_target=0x00007ffeefbfeed8, zig_triple_oz=0x0000000000000000, mcpu_oz=0x0000000000000000, dynamic_linker_oz=0x0000000000000000) at stage2.zig:742:33
    frame #17: 0x0000000100155ce1 zig`stage2_target_parse(target=0x00007ffeefbfeed8, zig_triple=0x0000000000000000, mcpu=0x0000000000000000, dynamic_linker=0x0000000000000000) at stage2.zig:671:22
    frame #18: 0x00000001001443dd zig`target_parse_triple(target=0x00007ffeefbfeed8, triple=0x0000000000000000, mcpu=0x0000000000000000, dynamic_linker=0x0000000000000000) at target.cpp:413:12
    frame #19: 0x00000001000080d5 zig`main0(argc=1, argv=0x00007ffeefbff748) at main.cpp:1336:16
    frame #20: 0x0000000100002d44 zig`main(argc=1, argv=0x00007ffeefbff748) at main.cpp:1851:19
    frame #21: 0x00007fff4f924115 libdyld.dylib`start + 1
    frame #22: 0x00007fff4f924115 libdyld.dylib`start + 1

Stack trace via Zig:

reached unreachable code
???:?:?: 0x102e6385c in _std.zig.system.NativeTargetInfo.detect (???)
???:?:?: 0x102e2fcae in _crossTargetToTarget (???)
???:?:?: 0x102e70be2 in _Stage2Target.fromTarget (???)
???:?:?: 0x102e092f4 in _stage2TargetParse (???)
???:?:?: 0x102e08ce0 in _stage2_target_parse (???)
???:?:?: 0x102df73dc in __Z19target_parse_tripleP9ZigTargetPKcS2_S2_ (???)
../src/main.cpp:1336:16: 0x102cbb0d4 in main0 (../src/main.cpp)
    if ((err = target_parse_triple(&target, target_string, mcpu, dynamic_linker))) {
               ^
../src/main.cpp:1851:19: 0x102cb5d43 in main (../src/main.cpp)
    auto result = main0(argc, argv);
                  ^
???:?:?: 0x7fff4f924114 in ??? (???)
???:?:?: 0x0 in ??? (???)
[1]    76658 abort      ./zig

[LemonBoy]

sysctlbynameZ is failing, what osx version are you on?

[tritao]

sysctlbynameZ is failing, what osx version are you on?

macOS 10.13.2 (High Sierra)

What can I do to help debug this?