[Bug fortran/127881] Wrong code: address instead of value passed for CHARACTER(c_char), VALUE dummy of BIND(C) interface when actual is a dummy argument or ACHAR() result

Mon, 26 Oct 2026 14:45:52 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127881

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-16 branch has been updated by Harald Anlauf
<[email protected]>:

https://gcc.gnu.org/g:8c04a7768f77c534a98d24c8eb109e9a1d8f04ed

commit r16-9841-g8c04a7768f77c534a98d24c8eb109e9a1d8f04ed
Author: Harald Anlauf <[email protected]>
Date:   Sun Oct 18 23:09:16 2026 +0200

    fortran: Fix CHARACTER(c_char),VALUE dummy of BIND(C) interface [PR127881]

    For a procedure declared with a BIND(C) interface, a scalar character dummy
    with the VALUE attribute shall always be passed by value.  Only a single
    character shall be passed.

            PR fortran/127881

    gcc/fortran/ChangeLog:

            * trans-expr.cc (conv_scalar_char_value): Fix passing of the case
of
            non-constant strings: always pass first first character by value.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/bind_c_char_value.f90: New test.
            * gfortran.dg/bind_c_char_value_aux.c: New test.

    (cherry picked from commit 96b3143c09001538084fb3159385f2a4fff9afc7)

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