Unable to use problemMatcher with GNU make and relative folder

Type: LanguageService

Describe the bug

• OS and Version: Linux Opensuse Tumbleweed
• VS Code Version: 1.53.2
• C/C++ Extension Version:1.2.2
• Other extensions you installed (and if the issue persists after disabling them):N/A
• Does this issue involve using SSH remote to run the extension on a remote machine?:No

In my project, i have :

PROJECT/
    Makefile
    folder1/source.c
    folder2/source.c
    ...
    build/

The Makefile process the compilation steps (ie mainly gcc calls) and stores the results in the build subfolder.

I configured a tasks.json :

    {
      "label": "Relase x64",
      "type": "shell",
      "command": "make -f Makefile config=release_linux64",
      "options": {
        "cwd": "${workspaceFolder}"
      },
      "group": {
        "kind": "build",
        "isDefault": true
      },
      "presentation": {
        "reveal": "always"
      },
      "problemMatcher": [ {
          "base": "$gcc",
          "fileLocation": ["relative", "${workspaceFolder}/build/"]
        }
      ]
    },

The compilation task is working properly, but it cannot parse/open the files in case of errors :

Please note that i tried with custom patterns, etc, etc : always the same result, the file is never properly parsed.

Steps to reproduce

1 - Setup a project kile the one above.
2 - Create a makefile with compilation in a subfolder
3 - When source files have reltive path with ../ it does not work

Expected behavior
When clicking in a file with a compilation error, it should jump to it.

Riproduci il problema con la struttura del progetto descritta, il Makefile, tasks.json e il problemMatcher $gcc usando percorsi relativi dalla cartella di build. Inizia tracciando il modo in cui l'output dell'attività risolve i percorsi dei sorgenti ../; il lavoro è completato quando facendo clic su un errore di compilazione si apre il file sorgente corretto. Nell'issue non sono identificati file di implementazione né test.