Fix windows build

Author: serpent7776

build.zig

@@ -259,6 +259,33 @@ pub fn build(b: *std.Build) void {
     test_all_step.dependOn(integration_test_step);
 }
 
+fn addMingwGccArchives(b: *std.Build, lib: *std.Build.Step.Compile, target_info: std.Target) bool {
+    // Only relevant for Windows targets
+    if (target_info.os.tag != .windows) return false;
+    const base_dir = switch (target_info.cpu.arch) {
+        .x86_64 => "/usr/lib/gcc/x86_64-w64-mingw32",
+        .x86 => "/usr/lib/gcc/i686-w64-mingw32",
+        else => return false,
+    };
+
+    var dir = std.fs.openDirAbsolute(base_dir, .{ .iterate = true }) catch return false;
+    defer dir.close();
+    var it = dir.iterate();
+    while (it.next() catch return false) |entry| {
+        if (entry.kind != .directory) continue;
+        const ver_dir = std.fmt.allocPrint(b.allocator, "{s}/{s}", .{ base_dir, entry.name }) catch return false;
+        defer b.allocator.free(ver_dir);
+        const gcc_eh = std.fmt.allocPrint(b.allocator, "{s}/libgcc_eh.a", .{ ver_dir }) catch return false;
+        defer b.allocator.free(gcc_eh);
+
+        if (std.fs.accessAbsolute(gcc_eh, .{})) |_| {
+            lib.addObjectFile(.{ .cwd_relative = gcc_eh });
+            return true;
+        } else |_| {}
+    }
+    return false;
+}
+
 fn configurePlatformLibraries(
     b: *std.Build,
     lib: *std.Build.Step.Compile,
@@ -517,6 +544,8 @@ fn tryConfigureVcpkg(
         lib.linkSystemLibrary("zlib"); // vcpkg installs as libzlib.a on Windows
         lib.linkSystemLibrary("lzma"); // vcpkg installs as liblzma.a
         // Note: deflate library not available in vcpkg mingw-static, skip it
+        // Explicitly add gcc archives to force resolution if needed
+        _ = addMingwGccArchives(b, lib, target_info);
     } else {
         lib.linkSystemLibrary("z");
         lib.linkSystemLibrary("lzma");