setup only compiles main.cpp leaving out all other cpp, or c files needed to be compiled with main

Basic setup, I have yet to find anything on how to get it to compile the rest of the files. Not everyone uses only main.c or main.cpp for their programs. I have to end up switching to the terminal provided within VS code , then adding everything needed to be compiled at the same time to get my programs to compiles. Which defeats the purpose of this does it not?

` "java": "cd $dir && javac $fileName && java $fileNameWithoutExt",
"c": "cd $dir && gcc $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
"cpp": "cd $dir && g++ -std=gnu++11 $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",`

errors gotten.

> [Running] cd "/media/data/C-Projects/VSC/C++/mh5000/" && g++ -std=gnu++11 main.cpp -o main && "/media/data/C-Projects/VSC/C++/mh5000/"main
> /tmp/ccaSa1en.o: In function `main':
> main.cpp:(.text+0x1c): undefined reference to `parse_options_array(int, char const**)'
> collect2: error: ld returned 1 exit status