Datasheet

Standard C Implementation Definition

B.1 Implementation definition

Appendix G of the ISO C standard (IS/IEC 9899:1990 (E)) collates information about

portability issues. Subclause G3 lists the behavior that each implementation must

document.

Note

This appendix does not duplicate information that is part of the compiler-specific

implementations. See Compiler-specific features on page 3-2. This section provides

references where applicable.

The following subsections correspond to the relevant sections of subclause G3. They

describe aspects of the ARM C compiler and ANSI C library, not defined by the ISO C

standard, that are implementation-defined:

• Translation on page B-3

• Environment on page B-3

• Identifiers on page B-5

• Characters on page B-5

• Integers on page B-5

• Floating-point on page B-5

• Arrays and pointers on page B-5

• Registers on page B-5

• Structures, unions, enumerations, and bitfields on page B-5

• Qualifiers on page B-6

• Declarators on page B-6

• Statements on page B-7

• Preprocessing directives on page B-7

• Library functions on page B-8.

Note

Nonconformance with ANSI

The compiler behavior differs from the behavior described in the language conformance

sections of the C standard in that there is no support for the

wctype.h

and

wchar.h

headers.