VSCode中Clang无法识别C++项目头文件问题求助

我是编程新手，还请见谅。目前用CMake和VSCode开发C++项目，碰到两个问题：

• 项目编译正常，但Clangd提示找不到头文件并标红，不过它能显示出头文件路径，说明它知晓文件位置
• 用相对路径引入头文件（比如../include/myHeader.hpp）能解决问题，但写法不够简洁，希望直接用myHeader.hpp引入

我的CMake预设已开启CMAKE_EXPORT_COMPILE_COMMANDS，配置如下：

{
    "version": 2,
    "configurePresets": [
        {
            "name": "debug",
            "displayName": "Debug",
            "binaryDir": "${sourceDir}/build",
            "generator": "Unix Makefiles",
            "cacheVariables": {
                "CMAKE_BUILD_TYPE": "Debug",
                "CMAKE_EXPORT_COMPILE_COMMANDS": "ON",
                "CMAKE_CXX_FLAGS_INIT": "-std=c++17 -g -Wall -Wextra -Wpedantic -Werror -Weffc++  -Wshadow -O0"
            }
        },
        {
            "name": "release",
            "displayName": "Release",
            "binaryDir": "${sourceDir}/build",
            "generator": "Unix Makefiles",
            "cacheVariables": {
                "CMAKE_BUILD_TYPE": "Release",
                "CMAKE_CXX_FLAGS_INIT": "-std=c++17 -march=native -flto -O3 -DNDEBUG"
            }
        }
    ]
}

VSCode相关配置如下：

"C_Cpp.intelliSenseEngine": "disabled",
"C_Cpp.configurationWarnings": "disabled",
"clangd.path": "/home/pa/.config/Code/User/globalStorage/llvm-vs-code-extensions.vscode-clangd/install/16.0.2/clangd_16.0.2/bin/clangd",
"clangd.arguments": [
    "-log=verbose",
    "-pretty",
    "--background-index",
    "--compile-commands-dir=${workspaceFolder}/build/",
    "--completion-style=detailed"
    // "--query-driver=/bin/arm-buildroot-linux-gnueabihf-g++", // for cross-compile usage
],
"[cpp]": {
    "editor.defaultFormatter": "llvm-vs-code-extensions.vscode-clangd"
}

恳请各位帮忙解决此问题，谢谢！

内容的提问来源于stack exchange，提问作者PA le chat