Path: csiph.com!news.mixmin.net!eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Tim Rentsch Newsgroups: comp.lang.c Subject: Re: Baby X resource compiler nearly ready Date: Tue, 08 Aug 2023 06:03:03 -0700 Organization: A noiseless patient Spider Lines: 29 Message-ID: <86edkdbsag.fsf@linuxsc.com> References: <1c2d0b65-3e37-4534-966f-d039a655773cn@googlegroups.com> <644ac909-d6b9-42b9-88c0-1442b6fd227an@googlegroups.com> <87wmy9rwi8.fsf@bsb.me.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: dont-email.me; posting-host="996336b78d58b8cbe9ae682ecb3e6882"; logging-data="3580797"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19xnWbrolA99tdx3Hu2a5ahbIyEcHibdzU=" User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux) Cancel-Lock: sha1:K7Doku8llowf9Iv+ePvcPiySaxE= sha1:zUBUjcfwOoEdI6mfLxVvyLrxGho= Xref: csiph.com comp.lang.c:171823 Spiros Bousbouras writes: > On Sun, 6 Aug 2023 04:36:47 -0700 (PDT) > Malcolm McLean wrote: >> #ifndef __int8_t_defined >> #define __int8_t_defined >> typedef unsigned char uint8_t; >> typedef signed char int8_t; >> typedef unsigned short uint16_t; >> typedef signed short int16_t; >> typedef unsigned int uint32_t; >> typedef signed int int32_t; >> #ifdef _MSC_VER >> typedef unsigned __int64 uint64_t; >> typedef signed __int64 int64_t; >> #else >> typedef unsigned long long uint64_t; >> typedef signed long long int64_t; >> #endif >> #endif > [...] the code above has undefined behaviour because it uses > reserved identifiers. [...] This code does have undefined behavior, but only because it /defines/ a reserved identifier. Simply /using/ a reserved identifier is not undefined behavior, only declaring or defining one.