RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
4.8 Compiler predefines
This section documents the predefined macros of the ARM compiler.
4.8.1 Predefined macros
Table 4-18 lists the macro names predefined by the ARM compiler for C and C++.
Where the value field is empty, the symbol is only defined.
Name Value When defined
Table 4-18 Predefined macros
__arm__ – Always defined for the ARM compiler, even when you specify the --thumb
option.
See also __ARMCC_VERSION.
__ARMCC_VERSION ver Always defined. It is a decimal number, and is guaranteed to increase between
releases. The format is PVtbbb where:
• P is the major version
• V is the minor version
• t is the patch release
• bbb is the build number.
Note
Use this to distinguish between RVCT and other tools that define __arm__.
__APCS_INTERWORK – When you specify the --apcs /interwork option or set the CPU architecture to
ARMv5T or later.
__APCS_ROPI – When you specify the --apcs /ropi option.
__APCS_RWPI – When you specify the --apcs /rwpi option.
__APCS_FPIC – When you specify the --apcs /fpic option.
__ARRAY_OPERATORS – In C++ compiler mode, to specify that array new and delete are enabled.
__BASE_FILE__ name Always defined. Similar to __FILE__, but indicates the primary source file
rather than the current one (that is, when the current file is an included file).
__BIG_ENDIAN – If compiling for a big-endian target.
_BOOL – In C++ compiler mode, to specify that bool is a keyword.
__cplusplus – In C++ compiler mode.
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