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Diffstat (limited to 'core/fxcrt/fx_fallthrough.h')
| -rw-r--r-- | core/fxcrt/fx_fallthrough.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/core/fxcrt/fx_fallthrough.h b/core/fxcrt/fx_fallthrough.h new file mode 100644 index 0000000000..5587ee2295 --- /dev/null +++ b/core/fxcrt/fx_fallthrough.h @@ -0,0 +1,20 @@ +// Copyright 2018 PDFium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifndef CORE_FXCRT_FX_FALLTHROUGH_H_ +#define CORE_FXCRT_FX_FALLTHROUGH_H_ + +// When clang suggests inserting [[clang::fallthrough]], it first checks if +// it knows of a macro expanding to it, and if so suggests inserting the +// macro. This means that this macro must be used only in code internal +// to PDFium, so that PDFium's user code doesn't end up getting suggestions +// for FX_FALLTHROUGH instead of the user-specific fallthrough macro. +// So do not include this header in any of PDFium's public headers. +#if defined(__clang__) +#define FX_FALLTHROUGH [[clang::fallthrough]] +#else +#define FX_FALLTHROUGH +#endif + +#endif // CORE_FXCRT_FX_FALLTHROUGH_H_ |