[bug] Intellisense/Autocompletion [C++] is not working!

[milan-r-shah]

general information
OS version: Ubuntu 18.04 LTS
Version of the plugin: v0.6.4

what is the bug
Intellisense/Autocompletion is not working!

I have already tried configuring my c_cpp_properties.json through this extension by running ROS: Update C++ properties command. But still, IntelliSense is not working. Here is my c_cpp_properties.json file:

{
    "configurations": [
        {
            "browse": {
                "databaseFilename": "",
                "limitSymbolsToIncludedHeaders": true
            },
            "includePath": [
                "/opt/ros/melodic/include/**",
                "/home/milan/catkin_ws/src/my_ros_package/include/**",
                "/usr/include/**"
            ],
            "name": "ROS",
            "intelliSenseMode": "gcc-x64",
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "gnu11",
            "cppStandard": "gnu++14"
        }
    ],
    "version": 4
}

expected behavior
Autocompletion should work!

additional context
In the extension setting:
Ros:Distro
ROS installation distro to be sourced.,
I tried putting:

• Melodic
  but it shows: Could not source the setup file for ROS distro "Melodic".

• /opt/ros/melodic/setup.bash
  but it shows: Could not source the setup file for ROS distro "/opt/ros/melodic/setup.bash".

• even my local setup.bash i.e. ~/catkin_ws/devel/setup.bash
  but it shows: Could not source the setup file for ROS distro "~/catkin_ws/devel/setup.bash".

[LucasWaelti]

Try to change from "cppStandard": "gnu++14" to "cppStandard": "c++14". ROS is using the c++14 standard, so specifying gnu++14 seems to break things. This was deduced from this question.

[ooeygui]

@LucasWaelti Thanks for the investigation!

[tranvnhan]

Try to change from "cppStandard": "gnu++14" to "cppStandard": "c++14". ROS is using the c++14 standard, so specifying gnu++14 seems to break things. This was deduced from this question.

It works for me. Thanks.