~mcf/cproc

#C23 status

cproc implements some C23 features applied to the latest drafts.

#N2265: _Static_assert without message

C11 required that static assertions always contained a message. C23 now allows _Static_assert with just an expression.

#N2418: UTF-8 character constants

C23 introduces UTF-8 character constants using the syntax u8'a'. Compared to an unprefixed character constant, they have type unsigned char instead of int, and are guaranteed to use UTF-8 encoding rather than the execution character set. Since the character in a UTF-8 character constant must have a single-byte UTF-8 encoding, this type of character constant could be useful when you need the ASCII value of a character, but do not want to depend on any particular execution character set.

#N2508: Free positioning of labels inside compound statements

In previous revisions of C, labels like foo:, case 123:, or default: could only precede statements. This was relaxed in C23, and they can now appear intermixed with declarations in compound statements.

#N2549: Binary integer constants

C23 allows binary integer constants in addition to octal, decimal, and hexadecimal, using syntax like 0b01101011.

About this wiki

commit 51e61fa5fa3de8cabc2191a5c6ac4d18aaaaf049
Author: Michael Forney <mforney@mforney.org>
Date:   2022-01-19T11:12:59-08:00

Handle unary minus specially instead of 0 - x

This is necessary to fix unary negation of floating-point 0 (also
depends on a pending qbe patch).
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