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Implementation definition

Appendix G of the ISO C standard (ISO/IEC 9899:1990 (E)) collates information about portability issues. Sub-clause G3 lists the behavior that each implementation must document.


This appendix does not duplicate information that is part of Compiler-specific Features. This appendix provides references where applicable.

The following topics correspond to the relevant sections of sub-clause G3. They describe aspects of the ARM C compiler and C library, not defined by the ISO C standard, that are implementation-defined:


The support for the wctype.h and wchar.h headers excludes wide file operations.