{"id":35694,"date":"2019-10-31T22:05:48","date_gmt":"2019-10-31T19:05:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/razrabotchiki-iz-google-predlozhili-razrabotat-svoyu-libc-dlya-llvm\/"},"modified":"2019-10-31T22:05:48","modified_gmt":"2019-10-31T19:05:48","slug":"razrabotchiki-iz-google-predlozhili-razrabotat-svoyu-libc-dlya-llvm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/razrabotchiki-iz-google-predlozhili-razrabotat-svoyu-libc-dlya-llvm","title":{"rendered":"Gli sviluppatori di Google hanno proposto di sviluppare la propria libc per LLVM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Uno dei sviluppatori di Google <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.llvm.org\/pipermail\/llvm-dev\/2019-June\/133269.html\">ha sollevato<\/a><\/noindex> sulla mailing list di LLVM il tema dello sviluppo di una libreria standard C multipiattaforma (Libc) nel quadro del progetto LLVM. Per vari motivi, Google non \u00e8 soddisfatta delle attuali libc (glibc, musl) e l'azienda sta lavorando a una nuova implementazione, che si propone di sviluppare come parte di LLVM.<\/p>\n<p> Negli ultimi tempi, le basi di LLVM sono state utilizzate come fondamenta per costruire gli strumenti di compilazione di Google. L'idea principale \u00e8 che se Google ha gi\u00e0 iniziato a sviluppare la propria libc, perch\u00e9 non sviluppare anche il proprio sistema all'interno di LLVM, che gi\u00e0 offre la sua libreria standard per C++ (Libc++) ma non ha una corrispondente libreria standard per C (Libc).<\/p>\n<p>La pianificazione dello sviluppo avverr\u00e0 in fasi, aumentando gradualmente le funzionalit\u00e0. Le prime versioni saranno proposte come uno strato intermedio tra l\u2019applicazione e la Libc di sistema, da cui saranno attinte funzionalit\u00e0 ancora non implementate. Dopo aver raggiunto un certo livello di funzionalit\u00e0, la nuova Libc potr\u00e0 essere utilizzata come sostituzione completa della Libc di sistema. Si inizier\u00e0 con il supporto per l'architettura x86-64, Linux e il collegamento statico (il caricamento dinamico, la compattazione e architetture aggiuntive saranno implementati in un secondo momento). <\/p>\n<p>Il progetto \u00e8 ancora in fase iniziale, ma sono gi\u00e0 definiti obiettivi di base:<\/p>\n<ul>\n<li class=\"l\"> Modularit\u00e0 e sviluppo in conformit\u00e0 con la filosofia della fornitura di una libreria granulare, piuttosto che di un insieme monolitico;\n<li class=\"l\"> Supporto per il collegamento statico in modalit\u00e0 con <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Position-independent_code#PIE\">PIE<\/a><\/noindex> (executables indipendenti dalla posizione) e senza PIE. Fornitura di CRT (C runtime) e caricatore PIE per file eseguibili collegati staticamente;\n<li class=\"l\"> Supporto della maggior parte delle funzioni della libreria standard C con integrazioni POSIX e alcune estensioni specifiche per i sistemi richieste nelle applicazioni esistenti;\n<li class=\"l\"> Un atteggiamento cauto nei confronti delle estensioni specifiche dei produttori e la loro integrazione solo se necessario. Per quanto riguarda il supporto delle estensioni di terze parti, si propone di adottare l'approccio dei progetti Clang e libc++;\n<li class=\"l\"> Utilizzo di pratiche esemplari nello sviluppo utilizzando gli strumenti LLVM, come l'applicazione di sanitizer e il fuzzing fin dall'inizio.\n<\/ul>\n<p>Uno degli sviluppatori attivi di LLVM <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.llvm.org\/pipermail\/llvm-dev\/2019-June\/133282.html\">ha indicato<\/a><\/noindex>, quindi la fornitura di libc all'interno degli strumenti LLVM non \u00e8 priva di senso, ma normalmente in situazioni simili viene utilizzata la libreria musl, che \u00e8 ben scritta, supporta diverse architetture e offre la funzionalit\u00e0 necessaria, inclusa la supporto per il linking dinamico. Pu\u00f2 essere giustificata l'integrazione di musl in LLVM e lo sviluppo come un fork sincronizzato con il progetto principale.<\/p>\n<p>La sua opinione \u00e8 stata espressa anche <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.llvm.org\/pipermail\/llvm-dev\/2019-June\/133308.html\">da<\/a><\/noindex> l'autore del progetto Musl, che ha cercato di argomentare perch\u00e9 la proposta di Google e l'inclusione di Libc nella fornitura di LLVM siano idee molto cattive:<\/p>\n<ul>\n<li class=\"l\"> Lo sviluppo e la manutenzione di una Libc corretta, compatibile e di alta qualit\u00e0 \u00e8 un compito molto difficile. Il problema non riguarda la quantit\u00e0 di codice, ma va garantito un comportamento corretto e affrontare le difficolt\u00e0 nella realizzazione delle interfacce, considerando la vasta gamma di applicazioni scritte in C\/C++ e in altri linguaggi, il cui runtime utilizza Libc. Un approccio diretto senza considerare le sfumature porter\u00e0 a far s\u00ec che molti programmi esistenti non siano in grado di funzionare con Libc, rendendo cos\u00ec il progetto poco interessante per i consumatori.\n<li class=\"l\"> Lo sviluppo aziendale pu\u00f2 compromettere Libc, spingendo per un ampio utilizzo, il che porta alla necessit\u00e0 di aggiungere hack per garantire la compatibilit\u00e0 nelle applicazioni. Lo sviluppo sotto l'egida di un progetto open source aziendale tende a favorire le esigenze e le soluzioni della compagnia, a discapito degli interessi della comunit\u00e0. Ad esempio, se emergesse un problema causato da un errore in un altro programma di loro propriet\u00e0, nella sviluppo controllato sarebbe pi\u00f9 semplice garantire la compatibilit\u00e0 di Libc con questo errore, che non correggere l'errore stesso. Apple utilizza a tal fine un fork di BSD libc, mentre Google usa in Fuchsia un fork di musl. L'esperienza di un sviluppatore di musl indica che i contatti sono avvenuti principalmente con avvocati per chiarimenti su questioni di licenza, ma mai per chiarire dettagli tecnici prima di apportare cambiamenti inutili e perturbanti nelle loro diramazioni.\n<li class=\"l\"> \u041e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435 \u043c\u043e\u043d\u043e\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u044b \u043f\u0440\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 libc \u0438 \u043e\u0440\u0438\u0435\u043d\u0442\u0430\u0446\u0438\u044f \u043d\u0430 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u044f \u043a\u043e\u043d\u0441\u0435\u043d\u0441\u0443\u0441\u0430 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u044b, \u0432\u043c\u0435\u0441\u0442\u043e \u0435\u0434\u0438\u043d\u043e\u043b\u0438\u0447\u043d\u043e\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f, \u0447\u0442\u043e \u043c\u043e\u0442\u0438\u0432\u0438\u0440\u0443\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u043f\u0440\u0438\u043a\u043b\u0430\u0434\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u044b, \u0430 \u043d\u0435 \u043f\u0440\u0438\u0432\u044f\u0437\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u043a \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u044b\u043c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u043c. \u0418\u043c\u0435\u043d\u043d\u043e \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0430\u0432\u0442\u043e\u0440 musl \u043f\u0440\u043e\u0442\u0438\u0432 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 LLVM, \u043a\u0430\u043a \u0438 \u043f\u0440\u043e\u0442\u0438\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 libc \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 LLVM, \u0442\u0430\u043a \u043a\u0430\u043a \u0432 \u044d\u0442\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0443\u0442\u0440\u0430\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0435\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u044b\u0439 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440 libc \u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u0440\u0435\u0448\u0435\u043d\u0438\u0435\u043c \u043f\u0435\u0440\u0432\u043e\u0433\u043e \u043a\u043b\u0430\u0441\u0441\u0430 \u0434\u043b\u044f LLVM, \u0430 \u0432\u0441\u0435 \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u044b\u0435 &#8212; \u0432\u0442\u043e\u0440\u043e\u0433\u043e.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50970\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u043e\u0434\u043d\u044f\u043b \u0432 \u0441\u043f\u0438\u0441\u043a\u0435 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0438 LLVM \u0442\u0435\u043c\u0443 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043c\u043d\u043e\u0433\u043e\u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 (Libc) \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 LLVM. \u041f\u043e \u0440\u044f\u0434\u0443 \u043f\u0440\u0438\u0447\u0438\u043d Google \u043d\u0435 \u0443\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u044e\u0442 \u0442\u0435\u043a\u0443\u0449\u0438\u0435 libc (glibc, musl) \u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u044f \u043d\u0430 \u043f\u0443\u0442\u0438 \u043a \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043d\u043e\u0432\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0442\u044c \u043a\u0430\u043a \u0447\u0430\u0441\u0442\u044c LLVM. \u041d\u0430\u0440\u0430\u0431\u043e\u0442\u043a\u0438 LLVM \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0441\u043d\u043e\u0432\u044b \u0434\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f [&hellip;]<\/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-35694","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google 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tema dello sviluppo di una libreria standard C multipiattaforma (Libc) all'interno del progetto LLVM. Per vari motivi, Google non \u00e8 soddisfatta delle attuali libc (glibc, musl) e l'azienda \u00e8 sulla buona strada per sviluppare una nuova implementazione, che si propone di sviluppare come parte di LLVM. 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