You can run external tools from Notepad ++. You can use something in the lines of the following command to compile a single source file as an executable using gcc:
cmd /K "c:\path\to\gcc.exe" "$(FULL_CURRENT_PATH)" -o "$(CURRENT_DIRECTORY)\$(NAME_PART).exe"
cmd /K stores the command prompt window after running the command; otherwise, it will exit immediately after the gcc process completes, which will not help if build errors occur.
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