{"id":103436,"date":"2022-02-25T21:37:00","date_gmt":"2022-02-25T19:37:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-5-18-planiruyut-razreshit-ispolzovanie-standarta-yazyka-si-c11"},"modified":"2022-02-25T21:37:00","modified_gmt":"2022-02-25T19:37:00","slug":"v-yadre-linux-5-18-planiruyut-razreshit-ispolzovanie-standarta-yazyka-si-c11","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/v-yadre-linux-5-18-planiruyut-razreshit-ispolzovanie-standarta-yazyka-si-c11","title":{"rendered":"V j\u00e1dru Linux 5.18 se pl\u00e1nuje povolen\u00ed pou\u017e\u00edv\u00e1n\u00ed standardu jazyka C11.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

B\u011bhem diskuse o sad\u011b patch\u016f, kter\u00e9 opravuj\u00ed probl\u00e9my souvisej\u00edc\u00ed s chybami t\u0159\u00eddy Spectre v k\u00f3du pro pr\u00e1ci s propojen\u00fdmi seznamy, se uk\u00e1zalo, \u017ee by bylo mo\u017en\u00e9 probl\u00e9m vy\u0159e\u0161it elegantn\u011bji, kdyby byl do j\u00e1dra povolen k\u00f3d v jazyce C, odpov\u00eddaj\u00edc\u00ed nov\u011bj\u0161\u00ed verzi standardu. V sou\u010dasn\u00e9 dob\u011b mus\u00ed p\u0159id\u00e1van\u00fd k\u00f3d do j\u00e1dra odpov\u00eddat specifikaci ANSI C (C89), kter\u00e1 byla formulov\u00e1na ji\u017e v roce 1989. <\/p>\n

Probl\u00e9m souvisej\u00edc\u00ed se Spectre v k\u00f3du byl zp\u016fsoben pokra\u010duj\u00edc\u00edm pou\u017e\u00edv\u00e1n\u00edm zvl\u00e1\u0161tn\u011b definovan\u00e9ho iter\u00e1toru po smy\u010dce \u2014 pro iteraci p\u0159es prvky propojen\u00e9ho seznamu je pou\u017eit makro, a proto\u017ee je iter\u00e1tor smy\u010dky p\u0159ed\u00e1v\u00e1n tomuto makru, je definov\u00e1n mimo samotnou smy\u010dku a z\u016fst\u00e1v\u00e1 p\u0159\u00edstupn\u00fd po smy\u010dce. Pou\u017eit\u00ed standardu C99 by umo\u017enilo definovat prom\u011bnn\u00e9 pro smy\u010dku v bloku for(), co\u017e by vy\u0159e\u0161ilo probl\u00e9m bez pot\u0159eby obch\u00e1zen\u00ed. <\/p>\n

Linus Torvalds souhlasil s my\u0161lenkou implementace podpory nov\u011bj\u0161\u00edch specifikac\u00ed a navrhl p\u0159ej\u00edt v j\u00e1d\u0159e 5.18 na pou\u017e\u00edv\u00e1n\u00ed standardu C11, publikovan\u00e9ho v roce 2011. P\u0159i p\u0159edb\u011b\u017en\u00e9 kontrole sestaven\u00ed v GCC a Clang v nov\u00e9m re\u017eimu prob\u011bhlo bez odchylek. Pokud se p\u0159i d\u016fkladn\u011bj\u0161\u00edm testov\u00e1n\u00ed nevyskytnou ne\u010dekan\u00e9 probl\u00e9my, bude v sestavovac\u00edch skriptech j\u00e1dra 5.18 mo\u017enost \u2018\u2014std=gnu89\u2019 nahrazena za \u2018\u2014std=gnu11 -Wno-shift-negative-value\u2019. Zva\u017eovala se mo\u017enost i pou\u017eit\u00ed standardu C17, ale v tomto p\u0159\u00edpad\u011b by m\u011blo b\u00fdt nutn\u00e9 zv\u00fd\u0161it minim\u00e1ln\u011b podporovanou verzi GCC. Za\u010dlen\u011bn\u00ed podpory C11 v\u0161ak spad\u00e1 do aktu\u00e1ln\u00edch po\u017eadavk\u016f na verzi GCC (5.1).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u044f \u043d\u0430\u0431\u043e\u0440\u0430 \u043f\u0430\u0442\u0447\u0435\u0439 \u0441 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u043c\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Spectre \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0432 \u043a\u043e\u0434\u0435 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u043c\u0438 \u0441\u043f\u0438\u0441\u043a\u0430\u043c\u0438, \u0441\u0442\u0430\u043b\u043e \u044f\u0441\u043d\u043e, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u0431\u044b \u0440\u0435\u0448\u0438\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u0438\u0437\u044f\u0449\u043d\u043e, 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103436","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47V j\u00e1dru Linux 5.18 se pl\u00e1nuje povolen\u00ed pou\u017e\u00edv\u00e1n\u00ed standardu jazyka C11 | ProHoster","description":"B\u011bhem diskuse o sad\u011b patch\u016f, kter\u00e9 opravuj\u00ed probl\u00e9my souvisej\u00edc\u00ed s chybami t\u0159\u00eddy Spectre v k\u00f3du pro pr\u00e1ci s propojen\u00fdmi seznamy, se uk\u00e1zalo, \u017ee by bylo mo\u017en\u00e9 probl\u00e9m vy\u0159e\u0161it elegantn\u011bji, 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