This issue is a roadmap for what we need to improve with regards to the C backend in LPython:

High Priority

• Add integration tests for the C backend #544
• Implement and test pointers (arguments)
• Implement C structs (passing as arguments, etc.)
• call other C functions that contain pointers, procedure calls, enums
• C Structs interop: Support C structs #606
• Implement and test pointers (indexing): Manipulating C pointers #546, Indexing a C array #609

Lower priority

• Import from C Header File #541
• Implement procedure calls arguments
• Syntax+semantics of p_c_pointer: Semantics of p_c_pointer and PointerToCPtr #592
• Get all strings working, including the C interop: Get C strings passing from Python to C #671
• Pointer(x) does not update x: pointer(x) doesn't update x in CPython #670