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Subject: [Bug fortran/107426] [12/13/14 Regression] ICE in
 gfc_compare_derived_types, at fortran/interface.cc:636
Date: Tue, 02 Apr 2024 13:11:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107426

--- Comment #13 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Mikael Morin
<mikael@gcc.gnu.org>:

https://gcc.gnu.org/g:3d05b9ac1c6ad950339f9487702c3165c189fe9e

commit r11-11305-g3d05b9ac1c6ad950339f9487702c3165c189fe9e
Author: Mikael Morin <mikael@gcc.gnu.org>
Date:   Thu Mar 21 17:27:54 2024 +0100

    fortran: Ignore use statements on error [PR107426]

    This fixes an access to freed memory on the testcase from the PR.
    The problem comes from an invalid subroutine statement in an interface,
    which is ignored and causes the following statements forming the proced=
ure
    body to be rejected.  One of them use-associates the intrinsic
ISO_C_BINDING
    module, which imports new symbols in a namespace that is freed at the t=
ime
    the statement is rejected.  However, this creates dangling pointers as
    ISO_C_BINDING is special and its import creates a reference to the impo=
rted
    C_PTR symbol in the return type of the global intrinsic symbol for C_LOC
    (see the function create_intrinsic_function).

    This change saves and restores the list of use statements, so that reje=
cted
    use statements are removed before they have a chance to be applied to t=
he
    current namespace and create dangling pointers.

            PR fortran/107426

    gcc/fortran/ChangeLog:

            * gfortran.h (gfc_save_module_list, gfc_restore_old_module_list=
):
            New declarations.
            * module.c (old_module_list_tail): New global variable.
            (gfc_save_module_list, gfc_restore_old_module_list): New functi=
ons.
            (gfc_use_modules): Set module_list and old_module_list_tail.
            * parse.c (next_statement): Save module_list before doing any w=
ork.
            (reject_statement): Restore module_list to its saved value.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/pr89943_3.f90: Update error pattern.
            * gfortran.dg/pr89943_4.f90: Likewise.
            * gfortran.dg/use_31.f90: New test.

    (cherry picked from commit a44d7e8a52007c2d45217709ca02947c6600de87)=