Build error with Python-3.7.0-rc1

[sagitter]

Hi all.

Recent recompilation of antimony by using Python-3.7 is failing with following error:

[  9%] Building CXX object lib/graph/CMakeFiles/SbGraph.dir/src/types/downstream.cpp.o
cd /builddir/build/BUILD/antimony-0.9.3/build/lib/graph && /usr/bin/c++   -isystem /usr/include/python3.7m -I/builddir/build/BUILD/antimony-0.9.3/lib/graph/inc  -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fPIC -pie -DNDEBUG -DRELEASE   -std=gnu++11 -o CMakeFiles/SbGraph.dir/src/types/downstream.cpp.o -c /builddir/build/BUILD/antimony-0.9.3/lib/graph/src/types/downstream.cpp
/builddir/build/BUILD/antimony-0.9.3/lib/graph/src/util.cpp: In function 'std::pair<std::__cxx11::basic_string<char>, int> getPyError()':
/builddir/build/BUILD/antimony-0.9.3/lib/graph/src/util.cpp:50:35: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]
         char* c = PyUnicode_AsUTF8(PyList_GetItem(lst, i));
                   ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [lib/graph/CMakeFiles/SbGraph.dir/build.make:157: lib/graph/CMakeFiles/SbGraph.dir/src/util.cpp.o] Error 1

System: Fedora 29 (devel branch)
Antimony commit 020910c
Python 3.7.0-rc1
Full build log: https://koji.fedoraproject.org/koji/getfile?taskID=27751872&volume=DEFAULT&name=build.log

Please, take a look.

[sagitter]

Workaround for fixing temporarily this error (from Fedora developers):

--- app/viewport/render/instance.h.orig	2016-11-27 19:16:48.000000000 -0700
+++ app/viewport/render/instance.h	2018-06-28 14:44:06.985669560 -0600
@@ -1,6 +1,8 @@
 #pragma once
 
+#undef slots
 #include <Python.h>
+#define slots Q_SLOTS
 #include <QObject>
 
 #include "viewport/image.h"
--- lib/graph/src/util.cpp.orig	2016-11-27 19:16:48.000000000 -0700
+++ lib/graph/src/util.cpp	2018-06-28 14:19:57.332549621 -0600
@@ -47,7 +47,7 @@ std::pair<std::string, int> getPyError()
     error_traceback = "";
     for (int i=0; i < PyList_Size(lst); ++i)
     {
-        char* c = PyUnicode_AsUTF8(PyList_GetItem(lst, i));
+        const char* c = PyUnicode_AsUTF8(PyList_GetItem(lst, i));
         assert(!PyErr_Occurred());
         error_traceback += std::string(c);
     }

[mkeeter]

Thanks for the reminder, that fix looks good to me.