RealView Compilation Tools - ARM Information Center

Introduction
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. These are:
• ISO C90
• ISO C99
• ISO C++.
1.2.1 ISO C90
The ARM compiler compiles C as defined by the 1990 C standard and addenda:
• ISO/IEC 9899:1990. The 1990 International Standard for C.
• ISO/IEC 9899 AM1. The 1995 Normative Addendum 1, adding international
character support through wchar.h and wtype.h.
The ARM compiler also supports several extensions to ISO C90. See Language
extensions and language compliance on page 1-5 for more information.
Throughout this document, the term:
C90
Strict C90
Means ISO C90, together with the ARM extensions.
Use the compiler option --c90 to compile C90 code. This is the default.
Means C as defined by the 1990 C standard and addenda.
See also
• --c90 on page 2-22
• Language extensions and language compliance on page 1-5
• Appendix B Standard C Implementation Definition.
1.2.2 ISO C99
The ARM compiler compiles C as defined by the 1999 C standard and addenda:
• ISO/IEC 9899:1999. The 1999 International Standard for C.
The ARM compiler also supports several extensions to ISO C99. See Language
extensions and language compliance on page 1-5 for more information.
Throughout this document, the term:
C99
Means ISO C99, together with the ARM and GNU extensions.
Use the compiler option --c99 to compile C99 code.
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