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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html |
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| .. | ||
| alloc_size.h | ||
| artificial.h | ||
| cold.h | ||
| const.h | ||
| constexpr.h | ||
| deprecated.h | ||
| diagnose_if.h | ||
| enum_extensibility.h | ||
| error.h | ||
| flag_enum.h | ||
| forceinline.h | ||
| format.h | ||
| maybe_unused.h | ||
| noalias.h | ||
| nodiscard.h | ||
| noexcept.h | ||
| noinline.h | ||
| nonnull.h | ||
| noreturn.h | ||
| pure.h | ||
| restrict.h | ||
| returns_nonnull.h | ||
| warning.h | ||
| weakref.h | ||