xcode 苹果 llvm 9.0 不能使用标志 c++17
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apple llvm 9.0 can not use flag c++17
提问by Fausturs
When I try some features of c++17, I build my code in command line as follow:
当我尝试 c++17 的一些功能时，我在命令行中构建我的代码如下：
llvm-g++ -std=c++17 main.cpp
but it failed. I got:
但它失败了。我有：
error: invalid value 'c++17' in '-std=c++17'
the version of my llvm-g++ is:
我的 llvm-g++ 的版本是：
[wjy@wjy-mba] cpp$ llvm-g++ -v
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
and at the same time, I can build my code in Xcode (with c++17). Xcode setting
同时，我可以在 Xcode（使用 c++17）中构建我的代码。 Xcode 设置
回答by ddavis
-std=c++17was added in Clang 5.0.0 (released very recently - earlier this month - see http://releases.llvm.org/5.0.0/tools/clang/docs/ReleaseNotes.html).
-std=c++17已添加到 Clang 5.0.0（最近发布 - 本月初 - 参见http://releases.llvm.org/5.0.0/tools/clang/docs/ReleaseNotes.html）。
This page https://en.wikipedia.org/wiki/Xcode#Latest_versionsappears to believe Xcode 9.0 is still using the LLVM/Clang 4.0 release. This is in agreement with the error you're running into.
此页面https://en.wikipedia.org/wiki/Xcode#Latest_versions似乎相信 Xcode 9.0 仍在使用 LLVM/Clang 4.0 版本。这与您遇到的错误一致。
回答by MCCCS
Apple-LLVM 10 that comes with Xcode 10 supports C++17 and C++20 draft:
Xcode 10 自带的 Apple-LLVM 10 支持 C++17 和 C++20 草案：
note: use 'c++98' or 'c++03' for 'ISO C++ 1998 with amendments' standard
note: use 'gnu++98' or 'gnu++03' for 'ISO C++ 1998 with amendments and GNU
extensions' standard
note: use 'c++11' for 'ISO C++ 2011 with amendments' standard
note: use 'gnu++11' for 'ISO C++ 2011 with amendments and GNU extensions'
standard
note: use 'c++14' for 'ISO C++ 2014 with amendments' standard
note: use 'gnu++14' for 'ISO C++ 2014 with amendments and GNU extensions'
standard
note: use 'c++17' for 'ISO C++ 2017 with amendments' standard
note: use 'gnu++17' for 'ISO C++ 2017 with amendments and GNU extensions'
standard
note: use 'c++2a' for 'Working draft for ISO C++ 2020' standard
note: use 'gnu++2a' for 'Working draft for ISO C++ 2020 with GNU extensions'
standard
回答by Lambo
I believe you are looking for the flag -std=c++1z
我相信您正在寻找标志 -std=c++1z
