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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 for more information.
Throughout this document, the term:
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.