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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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| .. | ||
| assume.h | ||
| attributes.h | ||
| bool.h | ||
| extern.h | ||
| gcc_version_since.h | ||
| inttypes.h | ||
| limits.h | ||
| long_long.h | ||
| r_cast.h | ||
| rmodule.h | ||
| stdalign.h | ||
| stdarg.h | ||