14.1 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
14.2 Translation
14.3 Environment
14.4 Identifiers
14.5 Characters
14.6 Integers
14.7 Floating-point
14.8 Arrays and pointers
14.9 Registers
14.10 Structures, unions, enumerations, and bitfields
14.11 Qualifiers
14.12 Expression evaluation
14.13 Preprocessing directives
14.14 Library functions
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