gcc4.9 编译stdatomic.h 异常

使用了# include <stdatomic.h>头文件后用gcc 编译报了如下错误：

/usr/lib/gcc/x86_64-linux-gnu/4.9/include/stdatomic.h:40:9: error: ‘_Atomic’ does not name a type
 typedef _Atomic _Bool atomic_bool;

用了网上的方法没法解决，后面想到android10源码也使用了一个头文件。

但是andorid10使用的是clang++ 编译的。于是我将vscode 配置成clang++ 编译，就能正常运行了。
配置如下：

c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**",
                "${workspaceFolder}/include"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/clang",
            "intelliSenseMode": "linux-clang-x64"
        }
    ],
    "version": 4
}

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "clang++ - Build and debug active file",
            "type": "cppdbg",
            "request": "launch",
            "program": "${fileDirname}/${fileBasenameNoExtension}",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ],
            "preLaunchTask": "C/C++: clang++ 生成活动文件",
            "miDebuggerPath": "/usr/bin/gdb" //这里要找到自己的llvm路径
        }
    ]
}

settings.json

{
    "files.associations": {
        "ostream": "cpp",
        "iostream": "cpp",
        "typeinfo": "cpp",
        "*.tcc": "cpp",
        "fstream": "cpp",
        "new": "cpp",
        "sstream": "cpp"
    }
}

tasks.json

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: clang++ 生成活动文件",
            "command": "/usr/bin/clang++",
            "args": [
                "-fcolor-diagnostics",
                "-fansi-escape-codes",
                "-g",
                "${workspaceFolder}/*.cpp",
                "-I",
                "${workspaceFolder}/include",
                "-o",
                "${workspaceFolder}/logcat",
                "-std=c++11"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": "build",
            "detail": "调试器生成的任务。"
        }
    ],
    "version": "2.0.0"
}