Zhiming Wang <zmwa...@gmail.com> added the comment:
Yeah, Apple LLVM versions are a major headache. I resorted to feature
detection, using C++ coroutines support as the clang 5 distinguisher[1]:
$ cat /tmp/test/stub.cc
#include <experimental/coroutine>
int main() {
return 0;
}
$
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-v
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
$
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-o stub stub.cc -fcoroutines-ts -stdlib=libc++
stub.cc:1:10: fatal error: 'experimental/coroutine' file not found
#include <experimental/coroutine>
^~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
$
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-v
Apple LLVM version 9.1.0 (clang-902.0.31)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
$
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-o stub stub.cc -fcoroutines-ts -stdlib=libc++
Here Xcode.app is Xcode 9.2 and Xcode-beta.app is Xcode 9.3 beta 2.
The conclusion here seems to be that Apple LLVM 9.0.0 is based on LLVM 4, while
Apple LLVM 9.1.0 is based on LLVM 5.
[1]
http://releases.llvm.org/5.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features
----------
status: pending -> open
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32616>
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