GNU Info

(g77-295.info)Complex Variables

---

Next: Arrays Prev: Local Equivalence Areas Up: Debugging and Interfacing

---

Enter node , (file) or (file)node

Complex Variables (COMPLEX)
===========================

   As of 0.5.20, `g77' defaults to handling `COMPLEX' types (and
related intrinsics, constants, functions, and so on) in a manner that
makes direct debugging involving these types in Fortran language mode
difficult.

   Essentially, `g77' implements these types using an internal
construct similar to C's `struct', at least as seen by the `gcc' back
end.

   Currently, the back end, when outputting debugging info with the
compiled code for the assembler to digest, does not detect these
`struct' types as being substitutes for Fortran complex.  As a result,
the Fortran language modes of debuggers such as `gdb' see these types
as C `struct' types, which they might or might not support.

   Until this is fixed, switch to C language mode to work with entities
of `COMPLEX' type and then switch back to Fortran language mode
afterward.  (In `gdb', this is accomplished via `set lang c' and either
`set lang fortran' or `set lang auto'.)