take out the garbage

build.zig

@@ -14,6 +14,8 @@ pub fn build(b: *std.Build) void {
         .name = "bloat-buster",
         .root_module = exe_mod,
     });
+    exe.linkLibC();
+    exe.linkSystemLibrary("LLVM");
 
     b.installArtifact(exe);
 

src/lib.zig

@@ -0,0 +1,30 @@
+const builtin = @import("builtin");
+extern "c" fn _errno() *c_int;
+extern "c" fn ptrace(c_int, c_int, usize, usize) c_long;
+extern "c" fn IsDebuggerPresent() bool;
+fn errno() Error {
+    return @enumFromInt(_errno().*);
+}
+
+pub const Error = enum(c_int) {
+    SUCCESS = 0,
+    PERM = 1,
+};
+
+pub const os = struct {
+    pub extern "c" fn exit(c_int) noreturn;
+    pub fn is_being_debugged() bool {
+        var result = false;
+        switch (builtin.os) {
+            .linux => {
+                if (ptrace(0, 0, 0, 0) == -1) {
+                    result = errno() == Error.PERM;
+                }
+            },
+            .windows => IsDebuggerPresent(),
+            else => {},
+        }
+
+        return result;
+    }
+};

src/main.zig

@@ -1,46 +1,23 @@
-//! By convention, main.zig is where your main function lives in the case that
-//! you are building an executable. If you are making a library, the convention
-//! is to delete this file and start with root.zig instead.
-
-pub fn main() !void {
-    // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
-    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
-
-    // stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    const stdout_file = std.io.getStdOut().writer();
-    var bw = std.io.bufferedWriter(stdout_file);
-    const stdout = bw.writer();
-
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
-
-    try bw.flush(); // Don't forget to flush!
+const lib = @import("lib.zig");
+pub fn panic(message: []const u8, stack_trace: ?*anyopaque, return_address: ?usize) noreturn {
+    _ = return_address;
+    _ = message;
+    _ = stack_trace;
+    if (lib.os.is_being_debugged()) {
+        @trap();
+    } else {
+        lib.os.exit(1);
+    }
 }
 
-test "simple test" {
-    var list = std.ArrayList(i32).init(std.testing.allocator);
-    defer list.deinit(); // Try commenting this out and see if zig detects the memory leak!
-    try list.append(42);
-    try std.testing.expectEqual(@as(i32, 42), list.pop());
+pub fn main() callconv(.C) c_int {
+    return 0;
 }
 
-test "use other module" {
-    try std.testing.expectEqual(@as(i32, 150), lib.add(100, 50));
+comptime {
+    if (!@import("builtin").is_test) {
+        @export(&main, @import("std").builtin.ExportOptions{
+            .name = "main",
+        });
+    }
 }
-
-test "fuzz example" {
-    const Context = struct {
-        fn testOne(context: @This(), input: []const u8) anyerror!void {
-            _ = context;
-            // Try passing `--fuzz` to `zig build test` and see if it manages to fail this test case!
-            try std.testing.expect(!std.mem.eql(u8, "canyoufindme", input));
-        }
-    };
-    try std.testing.fuzz(Context{}, Context.testOne, .{});
-}
-
-const std = @import("std");
-
-/// This imports the separate module containing `root.zig`. Take a look in `build.zig` for details.
-const lib = @import("bloat-buster_lib");