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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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| .. | ||
| 3 | ||
| backward | ||
| assert.h | ||
| backward.h | ||
| debug.h | ||
| defines.h | ||
| encoding.h | ||
| intern.h | ||
| io.h | ||
| missing.h | ||
| onigmo.h | ||
| oniguruma.h | ||
| re.h | ||
| regex.h | ||
| ruby.h | ||
| st.h | ||
| subst.h | ||
| thread.h | ||
| thread_native.h | ||
| util.h | ||
| version.h | ||
| vm.h | ||
| win32.h | ||