Xcode clang version record

xcode-clang-vers

# Xcode 4.3.3
Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix

# Xcode 4.3.2
Apple clang version 3.1 (tags/Apple/clang-318.0.58) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix

# Xcode 4.4
Apple clang version 4.0 (tags/Apple/clang-421.0.57) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix

# Xcode 4.4.1
Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix

# Xcode 4.5
Apple clang version 4.1 (tags/Apple/clang-421.11.65) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

# Xcode 4.5.1
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

# Xcode 4.5.2 (4G2008a)
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

# Xcode 4.6
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

# Xcode 4.6.1
Apple LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.3.0
Thread model: posix

# Xcode 4.6.2
Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.3.0
Thread model: posix

# Xcode 4.6.3
Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.4.0
Thread model: posix

# Xcode 5.0
Apple LLVM version 5.0 (clang-500.2.75) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin12.5.0
Thread model: posix

# Xcode 5.0.1 (5A2053), 5.0.2 (5A3005)
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix

# Xcode 5.1 (5B130a)
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix

# Xcode 5.1.1 (5B1008)
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix

# Xcode 6.0 b7 (6A280n), GM (6A313)
Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.3.0
Thread model: posix

# Xcode 6.0.1 (6A317)
Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

# Xcode 6.1 (6A1052c, 6A1052d)
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posix

# Xcode 6.1.1 (6A2008a)
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posix

# Xcode 6.2 (6C131e)
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.1.0
Thread model: posix

# Xcode 6.3 (6D570)
Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.1.0
Thread model: posix

# Xcode 6.3.1 (6D1002)
Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix

# Xcode 6.3.2 (6D2105)
Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix

# Xcode 6.4 (6E35b)
Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix
(That's there is no change?)

# Xcode 7.0 beta (7A120f)
Apple LLVM version 7.0.0 (clang-700.0.53)
Target: x86_64-apple-darwin14.4.0
Thread model: posix
(thanks @karies)

# Xcode 7.0 GM (7A218)
Apple LLVM version 7.0.0 (clang-700.0.72)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

# Xcode 7.0 (7A220)
Apple LLVM version 7.0.0 (clang-700.0.72)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
(thanks @LogicalKnight)

# Xcode 7.1 (7B91b)
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin15.0.0
Thread model: posix

# Xcode 7.1.1 (7B1005)
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin15.0.0
Thread model: posix

# Xcode 7.2 (7C68)
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.2.0
Thread model: posix
(thanks @bobsummerwill)

# Xcode 7.2.1 (7C1002)
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.3.0
Thread model: posix

# Xcode 7.3 (7D175)
Apple LLVM version 7.3.0 (clang-703.0.29)
Target: x86_64-apple-darwin15.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 7.3.1 (7D1014)
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.0 (8A218a)
Apple LLVM version 8.0.0 (clang-800.0.38)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.1 GM (8T61a) and 8.1 (8B62)
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.2 (8C38)
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.3 (8E162)
Apple LLVM version 8.1.0 (clang-802.0.38)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.3.1 (8E1000a)
Apple LLVM version 8.1.0 (clang-802.0.41)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.3.2 (8E2002)
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 8.3.3 (8E3004b)
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 9.0 (9A235)
Apple LLVM version 9.0.0 (clang-900.0.37)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 9.0.1 (9A1004)
Apple LLVM version 9.0.0 (clang-900.0.38)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 9.1 (9B55)
Apple LLVM version 9.0.0 (clang-900.0.38)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 9.2 (9C40b)
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 9.3 (9E145) and 9.3.1 (9E501)
Apple LLVM version 9.1.0 (clang-902.0.39.1)
Target: x86_64-apple-darwin17.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 9.4 (9F1027a) and 9.4.1 (9F2000)
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin17.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 10 beta (10L176w)
Apple LLVM version 10.0.0 (clang-1000.10.25.5)
Target: x86_64-apple-darwin17.6.0
Thread model: posix
InstalledDir: /path/to/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 10.0 (10A255)
Apple LLVM version 10.0.0 (clang-1000.11.45.2)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

# Xcode 10.1 (10B61)
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin18.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Thank you for sharing this, it is an excellent reference to have bookmarked. (Found it via Google.)

Xcode 5 final release is clang-500.2.76

Really?
This is no change from "500.2.75" where is my.

any chance you know what version of LIBC++ they are shipping with each one of these Apple LLVM versions?

I don't record the libc++.

After today's update of command line tools/xcode I get:

About Xcode:
Version 6.2 (6C131e)

/usr/bin/clang++ --version
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.1.0
Thread model: posix

Thanks.

After today's update of command line tools/xcode I get:

About Xcode:
Version 6.3 (6D570)

/usr/bin/clang++ --version
Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.1.0
Thread model: posix

(The bug preventing having debug symbols with C++ code containing C++14 type-deduced (auto) functions seems to be corrected. Hooray! :-))

EDIT: I see now that this update was already included in the list above. Sorry for the duplicate.

Xcode 7.0 beta (7A120f) after xcode-select'ing it:
Apple LLVM version 7.0.0 (clang-700.0.53)
Target: x86_64-apple-darwin14.4.0
Thread model: posix

Thanks @karies.
I update this page with your information.

Does anyone know how to change the compiler version on an xcode target? I can only select 'latest llvm' from the build settings.

Xcode 7,1 beta
Apple LLVM version 7.0.0 (clang-700.1.74)
Target: x86_64-apple-darwin14.4.0
Thread model: posix

Xcode 7.0 (7A220)
$ clang --version
Apple LLVM version 7.0.0 (clang-700.0.72)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

Thanks @LogicalKnight.

Xcode 7.0.1 (7A1001)
Apple LLVM version 7.0.0 (clang-700.0.72)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

Xcode 7.1 (7B91b)
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

Thanks @minsko

Xcode 7.2 beta (7C46l)
Apple LLVM version 7.0.0 (clang-700.1.78)
Target: x86_64-apple-darwin15.0.0
Thread model: posix

Is Xcode 7's LLVM based on 3.7? I assume it is since they were both released around the same time, but I'm curious why clang --version no longer reports this.

Xcode 7.1.1 (7B1005)
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
(Same as Xcode 7.1)

Any ideas when Apple is going to release clang-700.0.72 sources?

Xcode Version 7.2 (7C68)
Apple LLVM version 7.0.2 (clang-700.1.81)

More detailed version of previous post:

Xcode Version 7.2 (7C68)
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.2.0
Thread model: posix

Xcode 7.3 beta 2 (7D129n)
Apple LLVM version 7.3.0 (clang-703.0.16.1)
Target: x86_64-apple-darwin15.3.0
Thread model: posix

@ikantor clang-700.0.72 is finally out - http://opensource.apple.com/release/developer-tools-70/

The reported Target is based on the OS being used and has little to do with the clang version. The thread model is hard-coded as 'posix'. Neither of these need to be recorded.

Xcode 7.3 (7D175)
Apple LLVM version 7.3.0 (clang-703.0.29)
Target: x86_64-apple-darwin15.4.0
Thread model: posix

What about versions of the vanilla LLVM/Clang for clang-7xx.x.xx versions?

Apple LLVM passes from 7.0 to 7.3??? why? there is no 7.1 nor 7.2?

Which version of LLVM is Apple LLVM 7.3 based on?

Apple LLVM 7.0 looks like based on LLVM 3.7.0svn (I'm guessing from http://opensource.apple.com/source/clang/clang-700.0.72/src/configure)

Xcode 7.3.1 (7D1014)
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.4.0
Thread model: posix

+1 for how can i know the vanilla clang version apple is using basis

Looking at the sources (src/CMakeLists.txt), it appears AppleClang is based on (approximately) the following LLVM branches:
clang-700.0.72 => LLVM 3.7.0
clang-700.1.76 => LLVM 3.7.0
clang-700.1.81 => LLVM 3.7.0
clang-703.0.29 => LLVM 3.8.0
clang-703.0.31 => LLVM 3.8.0

Xcode 8 beta
Apple LLVM version 8.0.0 (clang-800.0.31)
Target: x86_64-apple-darwin16.0.0
Thread model: posix

Xcode 8
Apple LLVM version 8.0.0 (clang-800.0.38)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

Any idea the llvm version for clang-800.0.38?

Any idea with the llvm version for clang-800.0.38 and later?

@hainesc @cjrams I have the same question.

A quick look at src/CMakeLists.txt on https://opensource.apple.com/ suggests that 800.0.38 and 800.0.42 are both based on the 3.9.0 branch:

if(NOT DEFINED LLVM_VERSION_MAJOR)
set(LLVM_VERSION_MAJOR 3)
endif()
if(NOT DEFINED LLVM_VERSION_MINOR)
set(LLVM_VERSION_MINOR 9)
endif()
if(NOT DEFINED LLVM_VERSION_PATCH)
set(LLVM_VERSION_PATCH 0)
endif()
if(NOT DEFINED LLVM_VERSION_SUFFIX)
set(LLVM_VERSION_SUFFIX svn)
endif()

Here is the full path to the file @pkolbus mentioned.

https://opensource.apple.com/source/clang/clang-800.0.42.1/src/CMakeLists.txt

Xcode Version 8.3 beta (8W109m)
Apple LLVM version 8.1.0 (clang-802.0.27.2)
Target: x86_64-apple-darwin16.3.0
Thread model: posix

@pkolbus @mikemadden42 Also, configure.ac:

AC_INIT([LLVM],[3.9.0svn],[http://llvm.org/bugs/])

LLVM_VERSION_MAJOR=3
LLVM_VERSION_MINOR=9
LLVM_VERSION_PATCH=0
LLVM_VERSION_SUFFIX=svn

# Xcode 8.3.2 (8E2002)
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Presumably Xcode 8.3 is based on LLVM 4.0 (based on past versioning patterns). Sources for clang-802.x.y are not up yet.

why I cannot find https://opensource.apple.com/source/clang/clang-802.0.42? is it available anywhere?

@oasisweng I've put together a script that maps Developer Tools releases(*) to the upstream llvm branch that the version of clang it ships with is based on. You can find it here.

(*) only those for which Apple has made the source code publicly available, naturally

@jakepetroules, Looks like current Apple clang 802 does not yet support new clang 4.0 command line flags:

$ clang++ -v              
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

$ clang++ -MJ -c empty.cpp
clang: error: unknown argument: '-MJ'

$ clang++ -Og -c empty.cpp
error: invalid integral value 'g' in '-Og'
error: invalid integral value 'g' in '-Og'

This indicates, 802 is still based on 3.9.

Hey guys, does anybody know what version is Apple clang 9.0 based on? Did they move to 4.0?

Yes they did. Some c++17 features which are only supported on CLANG 4.0 are working with xcode 9 and they were not working on xcode 8.3
Infact I am hoping for a complete c++17 support with xcode 9 adopting CLANG 5.0 till the time it comes of beta.

Does anyone know which Apple Clang and Xcode corresponds to LLVM Clang 5.0?

We need LLVM Clang 5.0 or above to use Intel ADX intrinsics. However, LLVM 3.9 and 4.0 crash on the ADX intrinsic. We need the equivalent guard for Apple Clang and Xcode.

@niosus, yes, Apple LLVM version 9.0.0 (clang-900.0.35) from Xcode 9 beta 6 is based on at least clang 4.0 as it supports the new flags -MJ and -Og.

@noloader, Clang 5.0 officially released yesterday. Apple is only now testing clang 4.0 in beta xcode. It will probably be several months before Apple implements clang 5.0 in their machines.

Xcode 9.0 App Store release

Apple LLVM version 9.0.0 (clang-900.0.37)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Another update (9.0.1):

Xcode 9.0.1 (9A1004)

Apple LLVM version 9.0.0 (clang-900.0.38)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any ideas when Apple is going to release clang-900.0.37 sources?

Xcode Version 9.1 (9B55)

Apple LLVM version 9.0.0 (clang-900.0.38)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Xcode 9.2 beta 2 (9C34b)

Apple LLVM version 9.0.0 (clang-900.0.39)
Target: x86_64-apple-darwin17.0.0
Thread model: posix

Found this post via Google.

Just a quick question:
Recent Apple LLVM versions are no longer associated with any particular LLVM SVN versions. What is the status? Can I install llvm+clang from an SVN build and use it on macOS? I know this use case sounds strange, but just curious.

So the (conservative) mapping of Apple to LLVM versions would be:

5.1 -> 3.4
6.0 -> 3.5
7.0 -> 3.7
7.3 -> 3.8
8.0 -> 3.9
9.0 -> 4.0 (later ones could be 5.0?)

9.2 -> 5.0 is OK，while 4.0 is not

Xcode 9.3 beta 1 (9Q98q)

Apple LLVM version 9.1.0 (clang-902.0.30)
Target: x86_64-apple-darwin17.4.0
Thread model: posix

Xcode and command line tools 9.3 have been released.

Apple LLVM version 9.1.0 (clang-902.0.39.1)
Target: x86_64-apple-darwin17.5.0
Thread model: posix

Xcode 8.2.1

PACKAGE_NAME='LLVM'
PACKAGE_TARNAME='llvm'
PACKAGE_VERSION='3.9.0svn'
PACKAGE_STRING='LLVM 3.9.0svn'
PACKAGE_BUGREPORT='http://llvm.org/bugs/'

Xcode Version 9.4 (9F1027a)

released May 29, 2018

Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin17.5.0
Thread model: posix

Xcode 10.0 beta (10L176w)

Apple LLVM version 10.0.0 (clang-1000.10.25.5)
Target: x86_64-apple-darwin17.5.0
Thread model: posix

Xcode 10.0 beta 2 (10L177m)

Apple LLVM version 10.0.0 (clang-1000.10.25.5)
Target: x86_64-apple-darwin18.0.0
Thread model: posix

So apparently they did not bump clang between the beta versions - I am just posting for having a complete Xcode version to clang version record.

Anyone has any idea what the Apple Clang to Vanilla Clang version mappings are for 9.1.0 and 10.0.0? I realize Apple may be taking code between releases but it would be nice to at least establish lower bounds (for example, "9.1.0 is at least 5.0" or some such).

Xcode 10 beta 3 (10L201y)

Apple LLVM version 10.0.0 (clang-1000.10.38)
Target: x86_64-apple-darwin17.6.0
Thread model: posix

Note that the clang version was advanced in beta 3, unlike in beta 2.

Xcode 10.0 beta 4 (10L213o)

Apple LLVM version 10.0.0 (clang-1000.10.40.1)

Xcode 10.0 beta 6 (10L232m)

Apple LLVM version 10.0.0 (clang-1000.10.43.1)

clang version advanced again.

I believe xcode clang-9.1.0 is based on llvm 6.0.0 and xcode clang-10.0.0 is based on llvm 7.0, but not associated with any commits in the community version of llvm. the bitcode formats are diverged.

You can build your own llvm/cfe and use them in xcode under any workable version(e.g. no unresolvable syntax or unresolvable command line parameters) without bitcode enabled, since the bitcode would reject by AppStore.

@boris-kolpackov

@boris-kolpackov i may be wrong but I tried to find this by comparing header files... . step 0, install Xcode command line tools, step 1, download several versions of clang source code (cfe*) from http://releases.llvm.org/download.html and unpack with tar xf , step2, open terminal, cd to Downloads, then run recursive diff showing which files changed:

donbright@Macs-MacBook:~/Downloads$ diff -qr cfe-4.0.1.src/lib/Headers /Library/Developer/CommandLineTools/usr/lib/clang/9.1.0/include

donbright@Macs-MacBook:~/Downloads$ diff -qr cfe-5.0.2.src/lib/Headers /Library/Developer/CommandLineTools/usr/lib/clang/9.1.0/include

donbright@Macs-MacBook:~/Downloads$ diff -qr cfe-6.0.1.src/lib/Headers /Library/Developer/CommandLineTools/usr/lib/clang/9.1.0/include

If this method is correct (big if), it seems that 9.1.0 is very close to 5.0.2, much closer than 4 or 6, which have dozens of files differing, while 5.0.2 only differs by cuda, arm_neon.h, CMakeLists, and sanitizer.

@donbright Yes, that's the idea we had as well. One particularly informative header is libc++'s __config which defines the _LIBCPP_VERSION macro. For 9.1.0 it is 5000 which suggests it is from somewhere in the 5-series line. While for 10.0.0 (from Beta 6) it is 6000.

Xcode 10 GM (10A254a)

Apple LLVM version 10.0.0 (clang-1000.11.45.2)
Target: x86_64-apple-darwin17.7.0
Thread model: posix

Note that the target has changed as well. _LIBCPP_VERSION remains 6000.

Another approach is to observe that Xcode 9 ships with swift 4.1, and at https://github.com/apple/swift-llvm/blob/swift-4.1-branch/CMakeLists.txt we can see:

if(NOT DEFINED LLVM_VERSION_MAJOR)
  set(LLVM_VERSION_MAJOR 5)
endif()
if(NOT DEFINED LLVM_VERSION_MINOR)
  set(LLVM_VERSION_MINOR 0)
endif()
if(NOT DEFINED LLVM_VERSION_PATCH)
  set(LLVM_VERSION_PATCH 2)
endif()

Using this technique provides the following tentative version mapping:

Xcode 8.3  --> swift 3.1 --> llvm 4.0.0
Xcode 9.0  --> swift 4.0 --> llvm 4.0.0
Xcode 9.3  --> swift 4.1 --> llvm 5.0.2
Xcode 10.0 --> swift 4.2 --> llvm 6.0.1

Xcode 10.1 (10B61)

Apple LLVM version 10.0.0 (clang-1000.11.45.5)

Apple release source code of various versions of xcode recently. but clang was omitted since xcode 8.3

see https://opensource.apple.com/