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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