Source language modes

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1.2. Source language modes

The ARM compiler has three distinct source language modes that you can use to compile different varieties of C and C++ source code:

ISO C90

The ARM compiler compiles C as defined by the 1990 C standard and addenda, excepting wide I/O.

Use the compiler option --c90 to compile C90 code. This is the default.

ISO C99

The ARM compiler compiles C as defined by the 1999 C standard and addenda, excepting complex numbers and wide I/O.

Use the compiler option --c99 to compile C99 code.

ISO C++

The ARM compiler compiles C++ as defined by the 2003 standard, excepting wide streams and export templates.

Use the compiler option --cpp to compile C++ code.

The compiler provides support for numerous extensions to the C and C++ languages. For example, some GNU compiler extensions are supported. The compiler has several modes in which compliance to a source language is either enforced or relaxed:

Strict mode

In strict mode the compiler enforces compliance with the language standard relevant to the source language.

To compile in strict mode, use the command‑line option --strict.

GNU mode

In GNU mode all the GNU compiler extensions to the relevant source language are available.

To compile in GNU mode, use the compiler option --gnu.

For more information on source language modes and language compliance, see:

New features of C99
Source language modes in the Compiler Reference Guide
Language extensions and language compliance in the Compiler Reference Guide
‑‑c90 in the Compiler Reference Guide
‑‑c99 in the Compiler Reference Guide
‑‑cpp in the Compiler Reference Guide
‑‑gnu in the Compiler Reference Guide
‑‑[no_]strict in the Compiler Reference Guide.

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