optional nvcc flags

setup.py

@@ -88,10 +88,20 @@ def get_extensions():
 
     define_macros = []
 
+    extra_compile_args = {}
     if torch.cuda.is_available() and CUDA_HOME is not None:
         extension = CUDAExtension
         sources += source_cuda
         define_macros += [('WITH_CUDA', None)]
+        nvcc_flags = os.getenv('NVCC_FLAGS', '')
+        if nvcc_flags == '':
+            nvcc_flags = []
+        else:
+            nvcc_flags = nvcc_flags.split(' ')
+        extra_compile_args = {
+            'cxx': ['-O0'],
+            'nvcc': nvcc_flags,
+        }
 
     sources = [os.path.join(extensions_dir, s) for s in sources]
 
@@ -103,6 +113,7 @@ def get_extensions():
             sources,
             include_dirs=include_dirs,
             define_macros=define_macros,
+            extra_compile_args=extra_compile_args,
         )
     ]