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* define __STDC_UTF_{16,32}__ macrosÉrico Nogueira2021-04-191-0/+3
| | | | | these macros are used to indicate that the implementation uses, respectively, utf-16 and utf-32 encoding for char16_t and char32_t.
* add stdc-predef.h for library-level predefined macrosRich Felker2016-07-031-0/+10
modern compilers (for gcc, versions 4.8 and later) automatically pre-include <stdc-predef.h> to obtain the values of certain predefined macros specified by ISO C but which reflect properties of the library implementation, not just the compiler. provide values indicating that wchar_t is Unicode-encoded and that Annex F (IEEE floating point) is supported unless the compiler indicates otherwise. based on patch by Masanori Ogino.