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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkSafe_math_DEFINED
- #define SkSafe_math_DEFINED
- // This file protects against known bugs in ucrt\math.h.
- // Namely, that header defines inline methods without marking them static,
- // which makes it very easy to cause ODR violations and ensuing chaos.
- //
- // TODO: other headers? Here are some potential problem headers:
- // $ grep -R __inline * | grep -v static | cut -f 1 -d: | sort | uniq
- // corecrt.h
- // corecrt_stdio_config.h
- // ctype.h
- // fenv.h
- // locale.h
- // malloc.h
- // math.h
- // tchar.h
- // wchar.h
- // I took a quick look through other headers outside math.h.
- // Nothing looks anywhere near as likely to be used by Skia as math.h.
- #if defined(_MSC_VER) && !defined(_INC_MATH)
- // Our strategy here is to simply inject "static" into the headers
- // where it should have been written, just before __inline.
- //
- // Most inline-but-not-static methods in math.h are 32-bit only,
- // but not all of them (see frexpf, hypothf, ldexpf...). So to
- // be safe, 32- and 64-bit builds both get this treatment.
- #define __inline static __inline
- #include <math.h>
- #undef __inline
- #if !defined(_INC_MATH)
- #error Hmm. Looks like math.h has changed its header guards.
- #endif
- #define INC_MATH_IS_SAFE_NOW
- #else
- #include <math.h>
- #endif
- #endif//SkSafe_math_DEFINED
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