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Arm Compiler armclang Reference Guide : Identifiers

Identifiers

Describes implementation-defined aspects of the Arm® C compiler and C library relating to identifiers, as required by the ISO C standard.

Which additional multibyte characters may appear in identifiers and their correspondence to universal character names (6.4.2).

Multibyte characters, whose UTF-8 decoded value falls within one of the ranges in Appendix D of ISO/IEC 9899:2011 are allowed in identifiers and correspond to the universal character name with the short identifier (as specified by ISO/IEC 10646) having the same numeric value.

The dollar character $ is allowed in identifiers.

The number of significant initial characters in an identifier (5.2.4.1, 6.4.2).
There is no limit on the number of significant initial characters in an identifier.
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