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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/102145] TKR mismatches with -pedantic:
 -fallow-argument-mismatch does not degrade errors to warnings
Date: Tue, 31 Aug 2021 17:24:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102145

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
                 CC|                            |kargl at gcc dot gnu.org
           Priority|P3                          |P5

--- Comment #1 from kargl at gcc dot gnu.org ---
Bummer.

I do note that the gcc.info description describes -pedantic
in terms of only ISO C/C++, but let's assume -pedantic=20
should apply to ISO Fortran as well.  From the gcc manual

-Wpedantic'
'-pedantic'
     Issue all the warnings demanded by strict ISO C and ISO C++; reject
     all programs that use forbidden extensions, ...

>>From Fortran 2018, 4.2 Conformance

   A processor conforms to this document if:
   ...
   (10) it contains the capability to detect and report the reason for
   rejecting a submitted program.

Perhaps, gfortran is enforcing the "reject all programs that use
forbidden extensions," portion.

Improvements to the gfortran documentation are encouraged and
welcomed from  all users of gfortran that find it lacking.=