15.1 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. 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.

Related reference
15.2 Translation
15.3 Environment
15.4 Identifiers
15.5 Characters
15.6 Integers
15.7 Floating-point
15.8 Arrays and pointers
15.9 Registers
15.10 Structures, unions, enumerations, and bitfields
15.11 Qualifiers
15.12 Expression evaluation
15.13 Preprocessing directives
15.14 Library functions
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