Exit code 5 on Windows compiling external C API

[nekrondev]

Zig Version

0.10.0-dev.4197+9a2f17f9f

Steps to Reproduce

1. zig build on Windows 10 OS the following program

build.zig:

const std = @import("std");

pub fn build(b: *std.build.Builder) !void {
    const mode = b.standardReleaseOptions();
    const target = b.standardTargetOptions(.{});

    const service = b.addExecutable("crashfive", "src/main.zig");
    service.linkSystemLibrary("c");
    service.setBuildMode(mode);
    service.setTarget(target);

    // build and install the worker exe
    service.install();
}

main.zig:

const std = @import("std");

/// use Windows c-api signal function
/// build.zig must include C lib (exe.linkSystemLibrary("c");)
pub extern "c" fn signal(sig: c_int, handler: fn (c_int, c_int) callconv(.C) void) *anyopaque;

/// interruptFn used to catch CTRL-C on Windows OS only
/// see https://docs.microsoft.com/en-us/previous-versions/xdkz3x12(v=vs.140)
fn interruptFn(_: c_int, _: c_int) callconv(.C) void {}

/// main
pub fn main() void {
    _ = signal(std.c.SIG.INT, interruptFn);
}

Expected Behavior

Executable binary will be build without issues (this was working back when I was using zig in July 2022).

Actual Behavior

PS C:\Setup\zig\exitfive> zig build
error: crashfive...
error: The following command exited with error code 5:
C:\users\hbe\zig\zig.exe build-exe C:\Setup\zig\exitfive\src\main.zig -lc --cache-dir C:\Setup\zig\exitfive\zig-cache --global-cache-dir C:\Users\HBE\AppData\Local\zig --name crashfive --enable-cache 
error: the following build command failed with exit code 5:
C:\Setup\zig\exitfive\zig-cache\o\37906a44628083d55fdf5825df7c2698\build.exe C:\users\hbe\zig\zig.exe C:\Setup\zig\exitfive C:\Setup\zig\exitfive\zig-cache C:\Users\HBE\AppData\Local\zig

[nektro]

-pub extern "c" fn signal(sig: c_int, handler: fn (c_int, c_int) callconv(.C) void) *anyopaque;
+pub extern "c" fn signal(sig: c_int, handler: *const fn (c_int, c_int) callconv(.C) void) *anyopaque;

[nektro]

-fn interruptFn(_: c_int, _: c_int) callconv(.C) void {}
+export fn interruptFn(_: c_int, _: c_int) void {}

[nekrondev]

@nektro Hey that was amazingly fast! I'll give it a try and many thanks for your superfast help!!

Yea it works... issue solved within <<60s ... wooowww!!

[Vexu]

That example should not compile.

[nekrondev]

@Vexu The original source (without @nektro changes) did not compile on Windows but nor did print an error what's wrong (just exit code 5).

[nektro]

yeah the issue should stay open since it should report a compile error instead of crash. i was only providing guidance on a workaround @nekrondev :)

[nekrondev]

Yep.. ACK on that (error messages are always helpful but great community is the best)!