[TOC]
一、问题描述与分析
在使用vscode和cmake写cpp代码时，虽然可以编译通过，但是有红色下划线提示。主要原因在于vscode定位不到头文件
二、解决方法
直接按crtl + shift + P，选择C/C++:Edit Configurations(JSON)，之后会在项目所在的根目录下生成.vscode文件夹以及c_cpp_properties.json文件。
然后打开终端输入
gcc -v -E -x c++ -
得到类似结果如下
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE - -mtune=generic -march=x86-64 -fasynchronous-unwind-tables -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection -fcf-protection -dumpbase -
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/11"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/11
/usr/include/x86_64-linux-gnu/c++/11
/usr/include/c++/11/backward
/usr/lib/gcc/x86_64-linux-gnu/11/include
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
把#include <…> search starts here:对应的头文件路径部分加入到c_cpp_properties.json文件中的“includePath”部分变成这样
{
"configurations": [
{
"name": "Linux",
"includePath": [
"${workspaceFolder}/**",
"/usr/include/c++/11/**",
"/usr/include/x86_64-linux-gnu/c++/11/**",
"/usr/include/c++/11/backward/**",
"/usr/lib/gcc/x86_64-linux-gnu/11/include/**",
"/usr/local/include/**",
"/usr/include/x86_64-linux-gnu/**",
"/usr/include/**"
],
"defines": [],
"cStandard": "c17",
"cppStandard": "gnu++17"
}
],
"version": 4
}
问题解决！
