File 0001-Fix-PyVTKAddFile_-function-signature-mismatch.patch of Package vtk

From 4253aefd5b5bf5f68177b37b73588ed83d05ac7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Thu, 2 Jul 2020 19:29:04 +0200
Subject: [PATCH] Fix PyVTKAddFile_* function signature mismatch

The implementation generated in vtkWrapPython.c has void return type, as
noted by GCC when using LTO, e.g.:
--
./build/CMakeFiles/vtkRenderingOpenGL2PythonPython/vtkRenderingOpenGL2PythonInitImpl.cxx:85:24: warning: 'PyVTKAddFile_vtkPointFillPass' violates the C++ One Definition Rule [-Wodr]
    85 | extern "C" { PyObject *PyVTKAddFile_vtkPointFillPass(PyObject *dict); }
       |                        ^
./build/CMakeFiles/vtkRenderingOpenGL2Python/vtkPointFillPassPython.cxx:442:6: note: return value type mismatch
   442 | void PyVTKAddFile_vtkPointFillPass(
       |      ^
./build/CMakeFiles/vtkRenderingOpenGL2Python/vtkPointFillPassPython.cxx:442:6: note: 'PyVTKAddFile_vtkPointFillPass' was previously declared here
--
---
 Wrapping/Tools/vtkWrapPythonInit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Wrapping/Tools/vtkWrapPythonInit.c b/Wrapping/Tools/vtkWrapPythonInit.c
index 6b108c1aca..dcccd4cf5d 100644
--- a/Wrapping/Tools/vtkWrapPythonInit.c
+++ b/Wrapping/Tools/vtkWrapPythonInit.c
@@ -61,7 +61,7 @@ static void CreateImplFile(const char* libName, const char* importName, int numD
 
   for (i = 0; i < numFiles; i++)
   {
-    fprintf(fout, "extern \"C\" { PyObject *PyVTKAddFile_%s(PyObject *dict); }\n", files[i]);
+    fprintf(fout, "extern \"C\" { void PyVTKAddFile_%s(PyObject *dict); }\n", files[i]);
   }
 
   fprintf(fout, "\nstatic PyMethodDef Py%s_Methods[] = {\n", libName);
-- 
2.27.0