Setting up cppcheck

To install pre-built cppcheck: http://cppcheck.sourceforge.net/

sudo apt-get update
sudo apt-get install cppcheck

In case, you want to use latest cppcheck, download and build it from the source code

wget https://github.com/danmar/cppcheck/archive/2.1.tar.gz
tar zxvf 2.1.tar.gz
cd cppcheck-2.1
mkdir build
cd build
cmake ..

P.S: In case you are interested for cppcheck GUI use cmake -DBUILD_GUI=ON ..

make
sudo make install

Once installation is complete.

which cppcheck
/usr/local/bin/cppcheck

cppcheck --version
Cppcheck 2.1

Build your cpp project with cmake and pass on an extra parameter -DCMAKE_EXPORT_COMPILE_COMMANDS=TRUE to cmake. It will produce  compile_commands.json file in your build folder for the project.

Execute cppcheck -p </path/to/folder/having/compile_command.json>.

To use it in VSCode add following to the tasks.json

{
    "label": "Run cppCheck",
    "command": "/usr/local/bin/cppcheck",
    "args": [
       "--project=${workspaceRoot}/build/compile_commands.json"
    ],
    "problemMatcher": "$gcc",
}

Ref: https://gist.github.com/aakbar5/268a2072138345893b7f82590dcc3d26

Setting up include-what-you-need (IWYU)

Use following instructions to install IWYU (https://include-what-you-use.org/) on Ubuntu 18.04.3 LTS:

sudo apt-get update
sudo apt-get install -y build-essential cmake git zlib1g-dev libncurses5-dev llvm-6.0-dev libclang-6.0-dev libclang-6.0-dev clang-6.0
git clone https://github.com/include-what-you-use/include-what-you-use.git iwyu.git
cd iwyu.git
git checkout clang_6.0
mkdir -p build
cd build
cmake -DIWYU_LLVM_ROOT_PATH=/usr/lib/llvm-6.0 ..
make 
make install

Once installation is complete, you will find `include-what-you-need`

# include-what-you-use --version
include-what-you-use 0.10 (git:a1878c4) based on clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)

To execute include-what-you-need:

Build your cpp project with cmake and pass on an extra parameter -DCMAKE_EXPORT_COMPILE_COMMANDS=TRUE to cmake. It will produce  `compile_commands.json` file in your build folder for the project.

Execute iwyu_tool.py -p </path/to/folder/having/compile_command.json>. It may take time depending upon the code size.

fix_includes  can be used to apply recommended changes.

To use it in VSCode add following to the tasks.json

{
    "label": "Run iwyu",
    "command": "iwyu_tool.py",
    "args": [
        "-p",
        "${workspaceRoot}/build"
    ],
    "presentation": {
        "echo": true,
        "reveal": "always",
        "focus": true,
        "panel": "shared",
        "showReuseMessage": true,
        "clear": false
    },
    "problemMatcher": "$gcc"
}

Ref: https://gist.github.com/aakbar5/268a2072138345893b7f82590dcc3d26