Path: csiph.com!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Tim Rentsch Newsgroups: comp.lang.c Subject: Re: sizeof struct with flexible array: when did it change? Date: Sun, 06 Oct 2024 20:43:52 -0700 Organization: A noiseless patient Spider Lines: 13 Message-ID: <86y130zifb.fsf@linuxsc.com> References: <20241006192337.76@kylheku.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Date: Mon, 07 Oct 2024 05:43:53 +0200 (CEST) Injection-Info: dont-email.me; posting-host="a62c12983f398f111226e581353fb46e"; logging-data="1673085"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19rcmU5RTiPLlzjrhUHgzOjS+gb+9spPz4=" User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux) Cancel-Lock: sha1:0oUK1Ab2PF+H9hH+w5w+IlBhY/Q= sha1:mPkGAKiPS+yT0X63yXwvBqk6JHU= Xref: csiph.com comp.lang.c:388584 Kaz Kylheku <643-408-1753@kylheku.com> writes: > C99 said that the size of a structure that ends in a flexible array > member is the same as the offset of that flexible member in a > similar structure in which the array has some unspecified size. > > The latest draft says that the size is calculated as if the flexible > array member were omitted, except that there may be more padding than > the omission would imply. The change was made in a TC to C99, sometime in the early 2000s. (No I don't know which TC specifically, but the wording change can be seen in N1256.)