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RealView Compiler Reference Guide
Preface Introduction
About the ARM compiler Source language modes ISO C90 ISO C99 ISO C++ Language extensions and language compliance Language extensions Language compliance The C and C++ libraries Compiler Command-line Options Language Extensions Compiler-specific Features C and C++ Implementation Details Via File Syntax Standard C Implementation Definition Standard C++ Implementation Definition C and C++ Compiler Implementation LimitsLanguage compliance
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| Home > Introduction > Language extensions and language compliance > Language compliance | |||
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. For example, the use of //‑style comments results in an error when compiling strict C90.
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. For example, in GNU mode:
case ranges in switch statements are available when the source language is any of C90, C99 or non‑strict C++
C99‑style designated initializers are available when the source language is either C90 or non strict C++.
To compile in GNU mode, use the compiler option
--gnu.Note
Some GNU extensions are also available when you are in a non‑strict mode.
The following examples illustrate combining source language modes with language compliance modes:
Compiling a
.cppfile with the command‑line option--strictcompiles Standard C++Compiling a C source file with the command‑line option
--gnucompiles GNU mode C90Compiling a
.cfile with the command‑line options--strictand--gnuis an error.
File naming conventions in the Compiler User Guide.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0376A |
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