Editing LLVM (section)

==History==
The LLVM project started in 2000 at the [[University of Illinois at Urbana–Champaign]], under the direction of [[Vikram Adve]] and [[Chris Lattner]]. LLVM was originally developed as a research infrastructure to investigate [[dynamic compilation]] techniques for static and [[dynamic programming language|dynamic]] programming languages. LLVM was released under the [[University of Illinois/NCSA Open Source License]],<ref name="License"/> a [[permissive free software licence]]. In 2005, [[Apple Inc.]] hired Lattner and formed a team to work on the LLVM system for various uses within Apple's development systems.<ref name="Adam Treat">{{citation|url=http://lists.trolltech.com/qt4-preview-feedback/2005-02/msg00691.html |title=mkspecs and patches for LLVM compile of Qt4 |author=Adam Treat |date=February 19, 2005 |access-date=January 27, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20111004073001/http://lists.trolltech.com/qt4-preview-feedback/2005-02/msg00691.html |archive-date= October 4, 2011}}</ref> LLVM has been an integral part of Apple's [[Xcode]] development tools for [[macOS]] and [[iOS]] since Xcode 4 in 2011.<ref name="Apple LLVM Compiler">{{cite web |url=https://developer.apple.com/technologies/tools/ |title=Developer Tools Overview |website=Apple Developer |publisher=Apple |archive-url=https://web.archive.org/web/20110423095129/https://developer.apple.com/technologies/tools/ |archive-date=April 23, 2011}}</ref>

In 2006, Lattner started working on a new project named [[Clang]]. The combination of the Clang frontend and LLVM backend is named Clang/LLVM or simply Clang. 

The name ''LLVM'' was originally an [[initialism]] for ''Low Level Virtual Machine''. However, the LLVM project evolved into an umbrella project that has little relationship to what most current developers think of as a [[virtual machine]]. This made the initialism "confusing" and "inappropriate", and since 2011 LLVM is "officially no longer an acronym",<ref>{{cite mailing list |title=The name of LLVM |url=http://lists.llvm.org/pipermail/llvm-dev/2011-December/046445.html |last=Lattner |first=Chris |author-link=Chris Lattner |mailing-list=llvm-dev |date=December 21, 2011 |quote='LLVM' is officially no longer an acronym. The acronym it once expanded too was confusing, and inappropriate almost from day 1. :) As LLVM has grown to encompass other subprojects, it became even less useful and meaningless. |access-date=March 2, 2016}}</ref> but a brand that applies to the LLVM umbrella project.<ref>{{cite book |last1=Lattner |first1=Chris |editor1-last=Brown |editor1-first=Amy |editor2-last=Wilson |editor2-first=Greg |title=The architecture of open source applications |date=1 June 2011 |isbn=978-1257638017 |chapter-url=https://www.aosabook.org/en/llvm.html |chapter=LLVM|publisher=Lulu.com |quote=The name 'LLVM' was once an acronym, but is now just a brand for the umbrella project.}}</ref> The project encompasses the LLVM [[intermediate representation]] (IR), the LLVM [[debugger]], the LLVM implementation of the [[C++ Standard Library]] (with full support of [[C++11]] and [[C++14]]<ref>{{cite web|url=http://libcxx.llvm.org/|title="libc++" C++ Standard Library}}</ref>), etc. LLVM is administered by the LLVM Foundation. Compiler engineer Tanya Lattner became its president in 2014<ref>{{cite web |url=http://blog.llvm.org/2014/04/the-llvm-foundation.html |title=The LLVM Foundation |last=Lattner |first=Chris |author-link=Chris Lattner |date=April 3, 2014 |work=LLVM Project Blog}}</ref> and was in post {{As of|2024|March|lc=y}}.<ref>{{cite web |title=Board of Directors |url=https://foundation.llvm.org/docs/board/ |access-date=19 March 2024 |website=LLVM Foundation}}</ref>

''"For designing and implementing LLVM"'', the [[Association for Computing Machinery]] presented Vikram Adve, Chris Lattner, and [[Evan Cheng]] with the 2012 [[ACM Software System Award]].<ref>{{cite web |url=https://awards.acm.org/software-system/award-winners?year=2012&award=149&region=&submit=Submit&isSpecialCategory= |title=ACM Software System Award |publisher=ACM}}</ref>

The project was originally available under the [[UIUC license]]. After v9.0.0 released in 2019,<ref>{{cite web |last1=Wennborg |first1=Hans |title=[llvm-announce] LLVM 9.0.0 Release |url=https://lists.llvm.org/pipermail/llvm-announce/2019-September/000085.html |date=19 September 2019}}</ref> LLVM relicensed to the [[Apache License 2.0]] with LLVM Exceptions.<ref name="License"/> {{As of|2022|11|}} about 400 contributions had not been relicensed.<ref>{{cite web |title=Relicensing Long Tail |url=https://foundation.llvm.org/docs/relicensing_long_tail/ |website=foundation.llvm.org|date=11 November 2022}}</ref><ref>{{Cite web |title=LLVM relicensing - long tail |publisher=LLVM Project |via=Google Docs |date= |access-date=27 November 2022 |url= https://docs.google.com/spreadsheets/d/18_0Hog_eSwES8lKwf7WJal3yBwwcYfvPu1yCfZnTcek/edit#gid=975215793}}</ref>