I have not tried yet, but isn't it due to the fact that some parts are 
compiled with C and others with C++ ?

Le lundi 11 janvier 2021 à 11:28:47 UTC+1, jonatha...@googlemail.com a 
écrit :

> Super weird. I think it is a cython bug, but I'm not sure.
>
> The problem seems to be that the parent class has the same method. I need 
> to enforce the correct method
> by
>
> self.foo(u) -> SparseGraph.foo(self, u)
>
> This seems to work (compiles and the doctests pass).
>
> jonatha...@googlemail.com schrieb am Freitag, 8. Januar 2021 um 16:31:48 
> UTC+1:
>
>> Prepending 
>> # distutils: language = c++
>> to src/sage/graphs/base/sparse_graph.pyx makes my compilation crash.
>>
>> Does anyone know, how to fix it. I'm on develop and I'm getting the 
>> following compilation error. Does anyone know how to resolve this? Thank 
>> you.
>>
>> Jonathan
>>
>> (I want to see whether cpp set would be a reasonable alternative to our 
>> private tree implementation.)
>>
>> [sagelib-9.3.beta5] [3/3] gcc -Wno-unused-result -Wsign-compare -DNDEBUG 
>> -g -fwrapv -O3 -Wall -Wno-unused -march=native -O2 -g -march=native -O3 -g 
>> -fPIC -I./sage/data_structures 
>> -I/srv/public/kliem/sage/local/lib/python3.8/site-packages/cysignals 
>> -I./sage/cpython -Isage/data_structures 
>> -I/srv/public/kliem/sage/build/pkgs/sagelib/src 
>> -I/srv/public/kliem/sage/local/include/python3.8 
>> -I/srv/public/kliem/sage/local/lib/python3.8/site-packages/numpy/core/include
>>  
>> -Ibuild/cythonized -I/srv/public/kliem/sage/local/include/python3.8 -c 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp -o 
>> build/temp.linux-x86_64-3.8/build/cythonized/sage/graphs/base/sparse_graph.o 
>> -fno-strict-aliasing -DCYTHON_CLINE_IN_TRACEBACK=1 -std=c++11
>> [sagelib-9.3.beta5] build/cythonized/sage/graphs/base/sparse_graph.cpp: 
>> In function ‘PyObject* 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_add_arc_label(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph*,
>>  
>> int, int, int, 
>> __pyx_opt_args_4sage_6graphs_4base_12sparse_graph_11SparseGraph_add_arc_label*)’:
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:6543:94: error: cannot 
>> convert ‘__pyx_obj_4sage_6graphs_4base_7c_graph_CGraph*’ to 
>> ‘__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph*’
>> [sagelib-9.3.beta5]    __pyx_t_6 = 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_add_arc_label_unsafe(((struct
>>  
>> __pyx_obj_4sage_6graphs_4base_7c_graph_CGraph *)__pyx_v_self), __pyx_v_u, 
>> __pyx_v_v, __pyx_v_l); if (unlikely(__pyx_t_6 == ((int)-1))) __PYX_ERR(0, 
>> 917, __pyx_L1_error)
>> [sagelib-9.3.beta5]                                                          
>>                                     
>> ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:6280:155: note:   
>> initializing argument 1 of ‘int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_add_arc_label_unsafe(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph*,
>>  
>> int, int, int)’
>> [sagelib-9.3.beta5]  static int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_add_arc_label_unsafe(struct
>>  
>> __pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph *__pyx_v_self, int 
>> __pyx_v_u, int __pyx_v_v, int __pyx_v_l) {
>> [sagelib-9.3.beta5]                                                          
>>                                  
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
>> [sagelib-9.3.beta5] build/cythonized/sage/graphs/base/sparse_graph.cpp: 
>> In function ‘PyObject* 
>> __pyx_pf_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_4has_edge(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*,
>>  
>> PyObject*, PyObject*, PyObject*)’:
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:10771:105: error: cannot 
>> convert ‘__pyx_obj_4sage_6graphs_4base_7c_graph_CGraphBackend*’ to 
>> ‘__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*’
>> [sagelib-9.3.beta5]    __pyx_t_2 = 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend__has_labeled_edge_unsafe(((struct
>>  
>> __pyx_obj_4sage_6graphs_4base_7c_graph_CGraphBackend *)__pyx_v_self), 
>> __pyx_v_u_int, __pyx_v_v_int, __pyx_v_l); if (unlikely(__pyx_t_2 == 
>> ((int)-1))) __PYX_ERR(0, 1348, __pyx_L1_error)
>> [sagelib-9.3.beta5]                                                          
>>                                                
>> ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:2013:173: note:   
>> initializing argument 1 of ‘int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend__has_labeled_edge_unsafe(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*,
>>  
>> int, int, PyObject*)’
>> [sagelib-9.3.beta5]  static int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend__has_labeled_edge_unsafe(struct
>>  
>> __pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend 
>> *__pyx_v_self, int __pyx_v_u_int, int __pyx_v_v_int, PyObject *__pyx_v_l); 
>> /* proto*/
>> [sagelib-9.3.beta5]                                                          
>>                                             
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
>> [sagelib-9.3.beta5] build/cythonized/sage/graphs/base/sparse_graph.cpp: 
>> In function ‘int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend__has_labeled_edge_unsafe(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*,
>>  
>> int, int, PyObject*)’:
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:10828:96: error: cannot 
>> convert ‘__pyx_obj_4sage_6graphs_4base_7c_graph_CGraphBackend*’ to 
>> ‘__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*’
>> [sagelib-9.3.beta5]    __pyx_t_1 = ((PyObject 
>> *)__pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_cg(((struct
>>  
>> __pyx_obj_4sage_6graphs_4base_7c_graph_CGraphBackend *)__pyx_v_self))); if 
>> (unlikely(!__pyx_t_1)) __PYX_ERR(0, 1355, __pyx_L1_error)
>> [sagelib-9.3.beta5]                                                          
>>                                       
>> ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:2023:201: note:   
>> initializing argument 1 of ‘__pyx_obj_4sage_6graphs_4base_7c_graph_CGraph* 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_cg(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*)’
>> [sagelib-9.3.beta5]  static struct 
>> __pyx_obj_4sage_6graphs_4base_7c_graph_CGraph 
>> *__pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_cg(struct 
>> __pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend 
>> *__pyx_v_self); /* proto*/
>> [sagelib-9.3.beta5]                                                          
>>                                                                         
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
>> [sagelib-9.3.beta5] build/cythonized/sage/graphs/base/sparse_graph.cpp: 
>> In function ‘PyObject* 
>> __pyx_pf_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_8set_edge_label(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*,
>>  
>> PyObject*, PyObject*, PyObject*, int)’:
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:11440:97: error: cannot 
>> convert ‘__pyx_obj_4sage_6graphs_4base_7c_graph_CGraphBackend*’ to 
>> ‘__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*’
>> [sagelib-9.3.beta5]      __pyx_t_4 = 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_new_edge_label(((struct
>>  
>> __pyx_obj_4sage_6graphs_4base_7c_graph_CGraphBackend *)__pyx_v_self), 
>> __pyx_v_l); if (unlikely(__pyx_t_4 == ((int)-1))) __PYX_ERR(0, 1429, 
>> __pyx_L1_error)
>> [sagelib-9.3.beta5]                                                          
>>                                        
>> ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:9841:163: note:   
>> initializing argument 1 of ‘int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_new_edge_label(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend*,
>>  
>> PyObject*)’
>> [sagelib-9.3.beta5]  static int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_18SparseGraphBackend_new_edge_label(struct
>>  
>> __pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraphBackend 
>> *__pyx_v_self, PyObject *__pyx_v_l) {
>> [sagelib-9.3.beta5]                                                          
>>                                   
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:11503:90: error: cannot 
>> convert ‘__pyx_obj_4sage_6graphs_4base_7c_graph_CGraph*’ to 
>> ‘__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph*’
>> [sagelib-9.3.beta5]    __pyx_t_4 = 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_arc_label_unsafe(((struct
>>  
>> __pyx_obj_4sage_6graphs_4base_7c_graph_CGraph *)((struct 
>> __pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph 
>> *)__pyx_v_self->_cg)), __pyx_v_u_int, __pyx_v_v_int); if 
>> (unlikely(__pyx_t_4 == ((int)-1))) __PYX_ERR(0, 1434, __pyx_L1_error)
>> [sagelib-9.3.beta5]                                                          
>>                                 
>> ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> [sagelib-9.3.beta5] 
>> build/cythonized/sage/graphs/base/sparse_graph.cpp:6689:151: note:   
>> initializing argument 1 of ‘int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_arc_label_unsafe(__pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph*,
>>  
>> int, int)’
>> [sagelib-9.3.beta5]  static int 
>> __pyx_f_4sage_6graphs_4base_12sparse_graph_11SparseGraph_arc_label_unsafe(struct
>>  
>> __pyx_obj_4sage_6graphs_4base_12sparse_graph_SparseGraph *__pyx_v_self, int 
>> __pyx_v_u, int __pyx_v_v) {
>> [sagelib-9.3.beta5]                                                          
>>                              
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
>> [sagelib-9.3.beta5] error: command 'gcc' failed with exit status 1
>>
>>

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