This option enables the GNU compiler extensions supported
by the ARM compiler. The version of GCC the extensions are compatible
with can be determined by inspecting the predefined macros __GNUC__ and __GNUC_MINOR__.
In addition, in GNU mode, the ARM compiler emulates GCC in its conformance to the C/C++ standards, whether more or less strict.
UsageThis option can also be combined with other source language
command-line options. For example, armcc --c90 --gnu.
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