To have more from QtCreator you can build your own templates with most administrative issues already coded. To make your (and mine too) life easier I've added here the compressed templates ready to download. Modify them for your needs, they aren't what I can call fool proof but when using them a lot they will be more accurate to build any assembly language project. Only requirement is the installation of Qt and to remove all settings except the makefile in your project settings. Additionally you must fill in the makefile arguments (debug or release, profile isn't supported, and probably never will be. If anyone can fix this, let me know please).
The installation is quit simple.
a: go to your Qt installation directory.
b: find and enter Tools/QtCreator/share/qtcreator/templates/wizards
c: copy and unpack nasmsource.zip and nasminclude.zip in the directory files
d: copy and unpack nasm.zip, nasmarchive.zip and nasmsharedlib.zip in the directory projects
e: close QtCreator if it's still open and open again.
You should see the projects appear with the Nasm website icon beside it when creating a new project, the files you can see when you
want to add a new .as or .inc file to your program. You must relocate the files yourself within
the .pro file of your project tree.
For the latest updates check GitHub.
17 Feb 2018 - fixed nasmarchive.zip and nasmsharedlib.zip : type in Makefile