Question

I have a software, code of which I have modified and run make again.

If I run the modified code in a black QtCreator project it runs well (nothing specific to Qt, just an example), but if I compile with software’s original makefile, I get error on a line as:

(*F)=(double**) malloc((size_arr)*sizeof(double*));

Not in compile time, but a segmentation fault at runtime. F is a ***double by the way.

What should I check in makefile? Any guess?

Answer 1

Probably F is NULL or pointing to an invalid memory location. Since F gets dereferenced on the left side of the assignment, it needs to be properly initialized, so that it points to a memory location that can store the double** returned by malloc.