https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89100

            Bug ID: 89100
           Summary: Default widths for i, f and g format specifiers in
                    format strings
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mark.eggleston at codethink dot com
  Target Milestone: ---

Created attachment 45548
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45548&action=edit
Patch to support default widths for f, g and i

gfortran as of revision: svn+ssh://gcc.gnu.org/svn/gcc/trunk@268360

Fortran currently rejects format specifiers i, f and g without widths, e.g:

   24 |     write(buffer, "(A, F, A)") ':',real_4,':'
      |                       1
Error: Nonnegative width required in format string at (1)

The PGI Fortran compiler 18.10 silently accepts this with no compiler options.
Jakub Jelinek provided this link
https://software.intel.com/en-us/fortran-compiler-developer-guide-and-reference-default-widths-for-data-edit-descriptors
showing that ifort also defaults the widths of i, f and g.

Please find attach a patch that provides default widths for f, g and i.

As this feature is non-standard and most likely originated with DEC Fortran it
is only available using the option -fdec-format-defaults which is also enabled
by -fdec.

For trunk and supported versions.

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