C++ Clang 看不到基本标题
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Clang doesn't see basic headers
提问by sweet_sugar
I've tried to compile simple hello world on Fedora 20 with Clang, and I get the following output:
我尝试使用 Clang 在 Fedora 20 上编译简单的 hello world，得到以下输出：
d.cpp:1:10: fatal error: 'iostream' file not found
#include <iostream>
d.cpp:1:10: 致命错误：找不到“iostream”文件
#include <iostream>
I don't have any idea how to resolve it.
我不知道如何解决它。
采纳答案by user4823890
Point 3solved the problem for me.
第 3 点为我解决了问题。
1. Had the same issue, fedora 21::clang 3.5.0:
1. 有同样的问题，fedora 21::clang 3.5.0：
clang++ -std=c++14 -pedantic -Wall test_01.cpp -o test_01 -v
2.
2.
ignoring nonexistent directory "/usr/lib/gcc/i686-redhat-linux/4.9.2/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/bin/../lib/clang/3.5.0/include
/usr/include
End of search list.
test_01.cpp:1:10: fatal error: 'iostream' file not found
#include <iostream>
3.
3.
sudo yum install gcc-c++
4.
4.
#include "..." search starts here:
#include <...> search starts here:
/bin/../lib/gcc/i686-redhat-linux/4.9.2/../../../../include/c++/4.9.2
/bin/../lib/gcc/i686-redhat-linux/4.9.2/../../../../include/c++/4.9.2/i686-redhat-linux
/bin/../lib/gcc/i686-redhat-linux/4.9.2/../../../../include/c++/4.9.2/backward
/usr/local/include
/usr/bin/../lib/clang/3.5.0/include
/usr/include
/usr/lib/gcc/i686-redhat-linux/4.9.2/include
End of search list.
回答by ArunasR
This is because g++ is not installed, so libstdc++ is not present.
这是因为没有安装 g++，所以不存在 libstdc++。
You can install g++, or if LLVM is preferred, install LLVM libc++ and specify that you want to use it, like so:
您可以安装 g++，或者如果首选 LLVM，请安装 LLVM libc++ 并指定您要使用它，如下所示：
sudo apt-get install libc++-dev
clang++ -stdlib=libc++ <rest of arguments>
You may wish to link /usr/bin/c++ to the default compiler:
您可能希望将 /usr/bin/c++ 链接到默认编译器：
ln -s /usr/bin/c++ /usr/bin/clang++-libc++
and then compile simply using
然后简单地使用编译
$ c++ <args_as_usual>
回答by Stepan Dyatkovskiy
Looks like you should provide your clang build with -stdlib option. One of -stdlib=libc++ or -stdlib=libstdc++ will probably work. There are more details on your subject:
看起来您应该为您的 clang 构建提供 -stdlib 选项。-stdlib=libc++ 或 -stdlib=libstdc++ 之一可能会起作用。有关您的主题的更多详细信息：
回答by eyesfree
-stdlib=libstdc++ solved it for me. Here is my complete tasks.json config:
-stdlib=libstdc++ 为我解决了它。这是我完整的 tasks.json 配置：
{
"tasks": [
{
"type": "shell",
"label": "clang++ build active file",
"command": "clang++",
"args": [
"-std=c++11",
"-stdlib=libstdc++",
"hello.cpp",
"-o",
"hello.out",
"--debug"
],
"group": {
"kind": "build",
"isDefault": true
}
}
],
"version": "2.0.0"
