Fix debug command

docs/build.rst

@@ -168,9 +168,7 @@ Build with Debug
 To use debug information in PySCIPOpt you need to build it with the following command:
 
 .. code-block::
-
-  export CFLAGS="-UNDEBUG"
-  export CXXFLAGS="-UNDEBUG"
+  export PYSCIPOPT_DEBUG=True # With Windows CMD: set PYSCIPOPT_DEBUG=True
   python -m pip install .
 
 .. note:: Be aware that you will need the debug library of the SCIP Optimization Suite for this to work

setup.py

@@ -62,9 +62,8 @@
     extra_link_args.append(f"-Wl,-rpath,{libdir}")
 
 # enable debug mode if requested
-if "--debug" in sys.argv:
+if os.environ.get("PYSCIPOPT_DEBUG")=="True":
     extra_compile_args.append("-UNDEBUG")
-    sys.argv.remove("--debug")
 
 use_cython = True
 

tests/test_vars.py

@@ -79,4 +79,4 @@ def test_markRelaxationOnly():
     assert x.isRelaxationOnly()
     assert x.isDeletable()
     assert not y.isRelaxationOnly()
-    assert not y.isDeletable()
+    assert not y.isDeletable()