how to create a small zig file for viewing IR

example.zig

// trick #1 export a void function and put your logic here
// using std lib functions creates a lot of IR
export fn entry() void {
    var x: i32 = 1;
    x += 1;
}

// trick #2, override the default panic handler to something trivial
const std = @import("std");
pub fn panic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace) noreturn {
    @breakpoint(); unreachable;
}

// build this with:
// zig build-obj example.zig --verbose-ir
// or
// zig build-obj example.zig --verbose-llvm-ir