[Bug fortran/78822] New: [cleanup] replace static char buffers by std:string

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78822

            Bug ID: 78822
           Summary: [cleanup] replace static char buffers by std:string
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: janus at gcc dot gnu.org
  Target Milestone: ---

Several functions in interface.c use static-size char buffers for constructing
error messages, e.g.:

* gfc_compare_interfaces
* gfc_check_result_characteristics
* gfc_check_dummy_characteristics#
* ...

It would be more efficient to replace those by std::string, in order to
allocate the memory dynamically as needed (and only if needed at all).