Add an option for forcing build from source.

Author: gresm

README.md

@@ -12,10 +12,9 @@ This is re-packaged Nova Physics Python bindings, as currently official bindings
 
 Install with ``pip install git+https://github.com/gresm/nova-physics-python-fixed.git``
 
-The command will build the [Nova Physics](https://github.com/kadir014/nova-physics) from source, if you want to use pre-build Nova binaries run:
-``FORCE_NOVA_BINARIES="" pip install git+https://github.com/gresm/nova-physics-python-fixed.git``
-Binaries can be found [here](nova-binaries) but currently only for Linux x86/x86_64.
-They originate from the Nova Physics repository and can be downloaded [here](https://github.com/kadir014/nova-physics/releases/download/0.5.0/nova-physics-0.5.0-devel.tar.gz)
+The command will try to use the [Nova Physics](https://github.com/kadir014/nova-physics) binaries and fall-backs if none found, if you want to force usage pre-build Nova binaries run:
+``NOVA_FORCE="binaries" pip install git+https://github.com/gresm/nova-physics-python-fixed.git``
+Binaries can be found [here](nova-binaries) but currently only for Linux x86/x86_64. To force building from source run ``NOVA_FORCE="source" pip install git+https://github.com/gresm/nova-physics-python-fixed.git`` 
 
 The package will be installed under ``nova-physics`` namespace, but to import it in python use ``import nova``. Uninstalling is simple as ``pip uninstall nova-physics``.
 

setup.py

@@ -3,7 +3,8 @@
 from pathlib import Path
 from setuptools import setup, Extension
 
-FORCE_BINARIES = "FORCE_NOVA_BINARIES" in os.environ
+FORCE_BINARIES = "NOVA_FORCE" in os.environ and os.environ["NOVA_FORCE"].lower() == "binaries"
+FORCE_BUILD_SOURCE = "NOVA_FORCE" in os.environ and os.environ["NOVA_FORCE"].lower() == "source"
 
 PACKAGE_DIR = Path(__file__).parent
 
@@ -33,6 +34,8 @@
 def use_binaries():
     if FORCE_BINARIES:
         return True
+    if FORCE_BUILD_SOURCE:
+        return False
     return PREBUILT_OS_DIR.exists() and LOCAL_BINARIES.exists()
 
 
@@ -107,9 +110,14 @@ def main():
         # A dirty trick, for not-so-conventional implementation nova-python bindings.
         extra_compile_args=["-Wno-format-security"],
         extra_objects=[nova_to_link],
-        depends=[nova_to_link],
         optional=False
     )
+
+    print(
+        "See https://github.com/gresm/nova-physics-python-fixed/blob/master/troubleshooting-guide.md if error occurred "
+        "to see whether there is solution for your problem."
+    )
+
     setup(
         name="nova-physics",
         version="0.4.0",