vscode-cpptools/Extension/bin/linux.gcc.x64.json

{
  "defaults": [
    "--pack_alignment",
    "8",
    "-Dunix=1",
    "-D__unix__=1",
    "-D__linux__=1",
    "-D__x86_64=1",
    "-D__x86_64__=1",
    "-D__PTRDIFF_TYPE__=long int",
    "-D__SIZE_TYPE__=long unsigned int",
    "-D__WCHAR_TYPE__=int"
  ],
  "defaults_op" :  "merge"
}