什么是C17，并且对该语言进行了哪些更改? [英] What is C17 and what changes have been made to the language?

问题描述

当我查看有关GCC 8的新闻时，我

As I was checking news about GCC 8, I saw that they added support for the 2017 version of the C language (not C++17, really C17). But I can't find any information about it on Internet.

是像C11这样的新ISO版本，还是GCC团队在其编译器中进行某些更正的代号?

推荐答案

根据

According to GCC reference, C17 is actually a bug-fix version of the C11 standard with DR resolutions integrated.

C17 ，具有DR [缺陷报告]分辨率的C11标准的错误修复版本 集成，将很快进行投票.该补丁添加了对应的 选项-std=c17，-std=gnu17(新的默认版本，已替换 -std=gnu11作为默认值)，-std=iso9899:2017.作为错误修复版本 的标准，不需要flag_isoc17或任何其他选项 兼容性警告；但是，有一个新的__STDC_VERSION__ 值，因此将新的cpplib语言CLK_GNUC17和CLK_STDC17添加到 支持通过新选项使用该新值. (如果标准 最终于2018年发布，被称为C18，选项别名 可以添加.但是请注意，-std=iso9899:199409对应于 __STDC_VERSION__值而不是发布日期.)

C17, a bug-fix version of the C11 standard with DR [Defect Report] resolutions integrated, will soon go to ballot. This patch adds corresponding options -std=c17, -std=gnu17 (new default version, replacing -std=gnu11 as the default), -std=iso9899:2017. As a bug-fix version of the standard, there is no need for flag_isoc17 or any options for compatibility warnings; however, there is a new __STDC_VERSION__ value, so new cpplib languages CLK_GNUC17 and CLK_STDC17 are added to support using that new value with the new options. (If the standard ends up being published in 2018 and being known as C18, option aliases can be added. Note however that -std=iso9899:199409 corresponds to a __STDC_VERSION__ value rather than a publication date.)

(在GCC中需要实施几个DR决议，但是 这与新选项无关.)

(There are a couple of DR resolutions needing implementing in GCC, but that's independent of the new options.)

因此，C17不包含任何新功能.

So, there are no new features included in C17.

Cppreference(C历史)说:

未来发展

C17 下一个较小的C语言标准修订版，将包括所有接受的C11缺陷报告，但没有新功能.

C17 Next minor C language standard revision, will include all accepted C11 defect reports, but no new features.

更新:

• 2018:C17(ISO/IEC 9899:2018)( ISO 商店) (最终草案)包括ATOMIC_VAR_INIT及其修复 以下缺陷报告:

• 2018: C17 (ISO/IEC 9899:2018) (ISO Store) (Final draft) Includes the deprecation of ATOMIC_VAR_INIT and the fixes to the following defect reports:

[DR 400] ， [DR 401] ， [DR 402] ， [DR 404] ， [DR 405] ， [DR 410] ， [DR 412] ， [DR 416] ， [DR 417] ， [DR 426] ， [DR 428] ， [DR 431] ， [DR 433] ， [DR 437] ， [DR 438] ， [DR 444] ， [DR 445] ， [DR 450] ， [DR 452] ， [DR 458] ， [DR 459] ， [DR 464] ， [DR 465] ， [DR 471] ， [DR 472] ， [DR 477] ， [DR 480] ， [DR 487] ， [DR 491]

[DR 400], [DR 401], [DR 402], [DR 403], [DR 404], [DR 405], [DR 406], [DR 407], [DR 410], [DR 412], [DR 414], [DR 415], [DR 416], [DR 417], [DR 419], [DR 423], [DR 426], [DR 428], [DR 429], [DR 430], [DR 431], [DR 433], [DR 434], [DR 436], [DR 437], [DR 438], [DR 439], [DR 441], [DR 444], [DR 445], [DR 447], [DR 448], [DR 450], [DR 452], [DR 453], [DR 457], [DR 458], [DR 459], [DR 460], [DR 462], [DR 464], [DR 465], [DR 468], [DR 470], [DR 471], [DR 472], [DR 473], [DR 475], [DR 477], [DR 480], [DR 481], [DR 485], [DR 487], [DR 491]

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