[Topic DIscussion] 找不到C++标准库相关头文件
deepin Talks 342 views · 10 replies
Tofloor
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画卦伏羲
deepin
2022-06-28 18:07
Author

vscode + clang + clangd + cmake

CMakelists.txt中写入:

...
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED true)
...

main.cpp中(代码是从 cppreference上复制下来的,编译结果 concepts头文件找不到):

#include 
#include 
 
template
concept IsAnyOf = (std::same_as || ...);
 
template
concept IsPrintable = std::integral || std::floating_point ||
    IsAnyOf>>, char, wchar_t>;
 
void println(IsPrintable auto const ... arguments)
{
    (std::wcout << ... << arguments) << '\n';
}
 
int main() { println("Example: ", 3.14, " : ", 42, " : [", 'a', L'-', L"Z]"); }

编译输出:

/data/home/FuXii/Projects/Turbo/samples/CPPStandardTest.cpp:1:10: fatal error: 'concepts' file not found
#include 
         ^~~~~~~~~~
1 error generated.
make[2]: *** [samples/CMakeFiles/CPPStandardTest.dir/build.make:82: samples/CMakeFiles/CPPStandardTest.dir/CPPStandardTest.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:3322: samples/CMakeFiles/CPPStandardTest.dir/all] Error 2
make: *** [Makefile:171: all] Error 2
The terminal process "/usr/bin/bash '-c', 'make'" terminated with exit code: 2.

使用 sudo apt install各种下也没有解决头文件找不到的问题sob

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joo
deepin
2022-06-28 23:39
#1

试试,安装这几个包看看,build-essential、libc6-dev、libgdbm-dev,这是debian(包括衍生)cmake需要的很基础的编译和调试的包

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fuuko
deepin
2022-06-29 00:34
#2

检查一下clang版本,看它是否支持C++20

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画卦伏羲
deepin
2022-06-29 02:24
#3
fuuko

检查一下clang版本,看它是否支持C++20

FuXii@FuXii-PC:~$ clang --version
Debian clang version 15.0.0-++20220622102607+46be5faaf034-1~exp1~20220622222616.569
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

版本是15.0.0的,应该是支持 c++20

这是官网的 c++20支持信息:

image.png

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画卦伏羲
deepin
2022-06-29 02:29
#4
joo

试试,安装这几个包看看,build-essential、libc6-dev、libgdbm-dev,这是debian(包括衍生)cmake需要的很基础的编译和调试的包

FuXii@FuXii-PC:~$ sudo apt install build-essential
Reading package lists... Done
Building dependency tree   
Reading state information... Done
build-essential is already the newest version (12.6).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

FuXii@FuXii-PC:~$ sudo apt install libc6-dev
Reading package lists... Done
Building dependency tree   
Reading state information... Done
libc6-dev is already the newest version (2.28.19-1+dde).
libc6-dev set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

FuXii@FuXii-PC:~$ sudo apt install libgbdm-dev
Reading package lists... Done
Building dependency tree   
Reading state information... Done
E: Unable to locate package libgbdm-dev

libgdbm-dev找不到

我感觉应该不是这几个库的问题sob

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joo
deepin
2022-06-29 02:31
#5

libgdbm-dev不重要可有可无

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画卦伏羲
deepin
2022-06-29 02:35
#6
joo

libgdbm-dev不重要可有可无

不行 基本上开发相关库都是最新的了 concepts头文件还是找不到,我全局搜也没搜到sob

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joo
deepin
2022-06-29 02:41
#7

我对clang不熟悉,帮不上忙,你可以去clang官方社区提问,这样更快捷。

比如我看到一些人的提问:Just as a side note: Clang 10 (libc++) doesn't implement maybe this implementation can be used instead: https://github.com/cjdb/cjdb-ranges
So even if we get Clang 10 in ndk r22 it might not be useful for concepts any time soon.

你去官方问问clang 15支持 concepts了未

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joo
deepin
2022-06-29 02:43
#8
画卦伏羲

不行 基本上开发相关库都是最新的了 concepts头文件还是找不到,我全局搜也没搜到sob

不重要就是,不用安装

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joo
deepin
2022-06-29 02:55
#9

我确认c20是支持concepts的,但如何配置,需要你自己去看官方文档,

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画卦伏羲
deepin
2022-06-29 03:09
#10
joo

我确认c20是支持concepts的,但如何配置,需要你自己去看官方文档,

已经去llvm的github提issue了

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