Clang似乎忽略了Mac操作系统下的C++版本(std=gnu++14和类似版本)。
Clang似乎忽略了Mac操作系统下的C++版本(std=gnu++14和类似版本)。
提问于 2022-08-30 23:39:19
我正在MacOS11.6.8上开发，安装了Xcode 13.2.1 (但我正在开发VS代码中基于CMake的项目)。我对大量的构建错误感到困惑，例如：
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk/usr/include/c++/v1/iterator:419:
[build] /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk/usr/include/c++/v1/__functional_base:80:16: error: no template named 'unary_function'; did you mean 'binary_function'?
[build] static unary_function<_Ap, _Rp>最后，我搜索了整个项目，并确定这些必须是Boost使用unary_function，(据报道从C++ 17中删除)产生的。
set(CMAKE_CXX_STANDARD 14)在我的CMakeLists.txt里。
关于这个错误的网络搜索并没有显示出任何解决方案，但它确实出现了一些评论，询问苹果是否以某种方式破坏了前C++17的支持。我不知道如何实现对不同C++标准的支持。SDKs/MacOSX12.1.sdk/usr/include/c++/v1 (从错误输出中)提供了线索吗？
这是响亮的电话：
/usr/bin/clang++ -D_HAS_AUTO_PTR_ETC=0 -I/Users/me/data/series2server/include -I/Users/me/data/series2server/restbed/include -I/Users/me/data/series2server -I/Users/me/data/series2server/restbed_server/api -I/Users/me/data/series2server/restbed_server/model -g -arch arm64 -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk -pthread -std=gnu++14 -MD -MT CMakeFiles/Series2Server.dir/main.cpp.o -MF CMakeFiles/Series2Server.dir/main.cpp.o.d -o CMakeFiles/Series2Server.dir/main.cpp.o -c /Users/me/data/series2server/main.cpp使用unary_function的Boost 1.80.0文件是：
functional.hpp
hash.hpp
logical.hpp
unique_ptr.hpp以下是在操作系统11.6.8下Intel上的一系列错误：
In file included from /Users/me/data/series2server/main.cpp:3: THIS LINE SAYS #include <string>
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/string:511:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/string_view:179:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/__string:57:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/algorithm:652:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/utility:206:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/__debug:14:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/iosfwd:95:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/wchar.h:119:
In file included from .../MacOSX12.1.sdk/usr/include/wchar.h:91:
In file included from /Users/me/data/series2server/restbed_server/model/time.h:24: THIS LINE SAYS #include <memory>
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/memory:676:
In file included from .../MacOSX12.1.sdk/usr/include/c++/v1/iterator:419:
.../MacOSX12.1.sdk/usr/include/c++/v1/__functional_base:80:16: error: no template named 'unary_function'; did you mean 'binary_function'?
static unary_function<_Ap, _Rp>以下是OS12.5.1下M1上的错误堆栈：
In file included from /Users/me/data/series2server/main.cpp:3: THIS LINE SAYS #include<string>
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/string:519:
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/__debug:14:
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/iosfwd:98:
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/__mbstate_t.h:29:
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/wchar.h:123:
In file included from .../MacOSX12.3.sdk/usr/include/wchar.h:91:
In file included from /Users/me/data/series2server/restbed_server/model/time.h:24: THIS LINE SAYS #include <memory>
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/memory:674:
In file included from .../MacOSX12.3.sdk/usr/include/c++/v1/__memory/allocator.h:18:
.../MacOSX12.3.sdk/usr/include/c++/v1/stdexcept:83:32: error: unknown type name 'string'
explicit logic_error(const string&);最后注意:这是因为代码生成器创建了一个名为Time.h的文件，这显然导致了这些错误；我的猜测是，在其他地方出现了与同名文件的冲突。
回答 2
Stack Overflow用户
发布于 2022-08-31 01:42:28
无论是Boost我们的Apple似乎都配置错了。Boost肯定可以用C++17编译。如果配置正确，Boost将被定义为宏_HAS_AUTO_PTR_ETC=0并成功地使用C++17编译。参见functional.hpp。
#if defined(_HAS_AUTO_PTR_ETC) && !_HAS_AUTO_PTR_ETC
// std::unary_function and std::binary_function were both removed
// in C++17.
template <typename Arg1, typename Result>
struct unary_function
{
typedef Arg1 argument_type;
typedef Result result_type;
};
template <typename Arg1, typename Arg2, typename Result>
struct binary_function
{
typedef Arg1 first_argument_type;
typedef Arg2 second_argument_type;
typedef Result result_type;
};
#else
// Use the standard objects when we have them.
using std::unary_function;
using std::binary_function;
#endif可以添加到CMakeLists.txt中。
target_compile_definitions(${TARGET} _HAS_AUTO_PTR_ETC=0)Stack Overflow用户
发布于 2022-08-31 08:07:35
这个项目中的很多代码都是从OpenAPI文档中生成的。其中一个生成的类被称为Time。尽管它被表达在几个嵌套的命名空间中，但在某些时候，它似乎引起了与其他一些时间类或文件的混淆，并导致了这些模糊的错误。
重新命名OpenAPI文档中的时间架构，然后重新生成类似乎解决了这些问题。
谢谢你的反馈。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/73549468
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