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Enables the compilation of C90 source code.

It enforces C only, and C++ syntax is not accepted.


This option can also be combined with other source language command-line options. For example, armcc --c90 --gnu.

To ensure conformance with ISO/IEC 9899:1990, the 1990 International Standard for C and ISO/IEC 9899 AM1, the 1995 Normative Addendum 1, you must also use the --strict option.


This option is implicitly selected for files having a suffix of .c, .ac, or .tc.


If you are migrating from RVCT, be aware that filename extensions .ac and .tc are deprecated in ARM Compiler 4.1 and later.