ARM Compiler toolchain Compiler Reference: Standard C and Standard C++ language extensions

Standard C and Standard C++ language extensions

The compiler supports numerous extensions to both the ISO C99 and the ISO C++ Standards, such as various integral type extensions, various floating-point extensions, hexadecimal floating-point constants, and anonymous classes, structures, and unions.

These extensions are available if:

the source language is C++ and you are compiling in nonstrict mode
the source language is C99 and you are compiling in nonstrict mode
the source language is C90 and you are compiling in nonstrict mode.

These extensions are not available if:

the source language is C++ and the compiler is restricted to compiling strict C++ using the --strict compiler option.
the source language is C99 and the compiler is restricted to compiling strict Standard C using the --strict compiler option.
the source language is C90 and the compiler is restricted to compiling strict C90 using the --strict compiler option.

See:

Address of a register variable
Arguments to functions
Anonymous classes, structures and unions
Assembler labels
Empty declaration
Hexadecimal floating‑point constants
Incomplete enums
Integral type extensions
Label definitions
Long float
Nonstatic local variables
Structure, union, enum, and bitfield extensions.

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