| // Copyright 2021 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // This file is designed to be included from source files that explicitly should |
| // not use <windows.h>. The goal is to stop <windows.h> from creeping back into |
| // the Chromium build, with the namespace pollution which that implies. |
| // |
| // See https://crbug.com/796644 for more historical context. |
| // |
| // If you don't know why windows.h is #included, there are multiple ways to find |
| // out. One is to manually compile the file with `/showIncludes:user` and look |
| // at the include tree that results. Another is to temporarily edit your local |
| // windows.h (which may be in third_party\depot_tools\win_toolchain or installed |
| // on the system) and add an #error directive, recompiling to see the |
| // problematic #include chain. |
| |
| // Avoid header guards; if this file is somehow multiply-included, we want the |
| // preprocessor to check in every location. The next two lines disable PRESUBMIT |
| // and cpplint warnings for missing the guards. |
| // no-include-guard-because-multiply-included |
| // NOLINT(build/header_guard) |
| |
| #if defined(_WINDOWS_) |
| #error Windows.h was included unexpectedly. See comment above for details. |
| #endif |
