expected ‘struct matrix_t *’ but argument is of type ‘struct matrix_t *’ ?_? no difference

Question

main.c:78:25: erreur: assignment from incompatible pointer type [-Werror]
main.c:81:9: erreur: passing argument 2 of ‘matrix_multiply’ from incompatible pointer type         


        

Answer 1

Your type definition should read

typedef struct matrix_t {
   int **M;
   int nLi;
   int nCo;
   struct matrix_t *next;
} matrix_t;

Otherwise, the type matrix_t refers to a complete but unnamed structure type, whereas struct matrix_t refers to a different, named but incomplete structure type which you never define.