作者:红台门 | 来源:互联网 | 2023-02-01 09:47
我在clang
运行ArchLinux的系统上使用版本4.0.0,它总是工作正常,但最近我无法编译使用某些STL头文件的程序!
细节:
产量clang --version
:
clang version 4.0.0 (tags/RELEASE_400/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
产量gcc --version
:
gcc (GCC) 7.1.1 20170528
例:
我尝试编译以下简单的程序:
#include
int main()
{
return 0;
}
我使用以下命令:
clang++ -std=c++1z test.cxx
结果就是失败:
In file included from test.cxx:3:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/functional:60:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/unordered_map:47:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/bits/hashtable.h:37:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/bits/node_handle.h:39:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/optional:1032:27: error: use of
class template 'optional' requires template arguments
template optional(_Tp) -> optional<_Tp>;
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/optional:451:11: note: template
is declared here
class optional
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/optional:1032:40: error:
expected ';' at end of declaration
template optional(_Tp) -> optional<_Tp>;
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/optional:1032:41: error: cannot
use arrow operator on a type
template optional(_Tp) -> optional<_Tp>;
^
3 errors generated.
这是STL中的错误还是我的设置搞砸了?
1> Rakete1111..:
你的设置搞砸了.有趣的是,我有完全相同的问题.
当您升级到gcc 7.1.1时,libstdc ++(它是gcc的标准库)与它一起更新,以提供C++ 17的新功能.使用gcc,这是有效的,因为它几乎完全支持C++ 17.
但是铿锵没有.提示是-std=c++1z
标志而不是gcc的-std=c++17
标志.Clang缺少演绎指南,当它在libstdc ++中遇到它们时,它不知道如何处理它们.
您可以从ALA安装旧的libstdc ++包,也可以下载/使用LLVM的标准库libc ++,它自然只具有部分C++ 17功能.