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Subject: [Bug middle-end/101204] [12 Regression] infinite recursion in
 gtype-desc.c since r12-1801-g7036e9ef462fde8181bece4ac4e03f3aa27204dc
Date: Tue, 09 Nov 2021 12:21:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101204

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.or=
g>:

https://gcc.gnu.org/g:c71cb26a9e841888f52e4bfcaad94c8f8ecb4fdb

commit r12-5047-gc71cb26a9e841888f52e4bfcaad94c8f8ecb4fdb
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Tue Nov 9 10:55:15 2021 +0100

    Get rid of infinite recursion for 'typedef' used with GTY-marked
'gcc/diagnostic-spec.h:nowarn_map' [PR101204, PR103157]

    Reproduced with clang version 10.0.0-4ubuntu1:

        gtype-desc.c:11333:1: warning: all paths through this function will
call itself [-Winfinite-recursion]

    ... as well as some GCC's '-O2 -fdump-tree-optimized':

        void gt_pch_nx(int_hash<unsigned int, 0u, 4294967295u>*,
gt_pointer_operator, void*) ([...])
        {
          <bb 2>:

          <bb 3>:
          goto <bb 3>;

        }

    That three-arguments 'gt_pch_nx' function as well as two one-argument
    'gt_ggc_mx', 'gt_pch_nx' functions now turn empty:

        [...]
         void
        -gt_ggc_mx (int_hash<location_t,0,UINT_MAX>& x_r ATTRIBUTE_UNUSED)
        +gt_ggc_mx (struct xint_hash_t& x_r ATTRIBUTE_UNUSED)
         {
        -  int_hash<location_t,0,UINT_MAX> * ATTRIBUTE_UNUSED x =3D &x_r;
        -  gt_ggc_mx (&((*x)));
        +  struct xint_hash_t * ATTRIBUTE_UNUSED x =3D &x_r;
         }
        [...]
         void
        -gt_pch_nx (int_hash<location_t,0,UINT_MAX>& x_r ATTRIBUTE_UNUSED)
        +gt_pch_nx (struct xint_hash_t& x_r ATTRIBUTE_UNUSED)
         {
        -  int_hash<location_t,0,UINT_MAX> * ATTRIBUTE_UNUSED x =3D &x_r;
        -  gt_pch_nx (&((*x)));
        +  struct xint_hash_t * ATTRIBUTE_UNUSED x =3D &x_r;
         }
        [...]
         void
        -gt_pch_nx (int_hash<location_t,0,UINT_MAX>* x ATTRIBUTE_UNUSED,
        +gt_pch_nx (struct xint_hash_t* x ATTRIBUTE_UNUSED,
                ATTRIBUTE_UNUSED gt_pointer_operator op,
                ATTRIBUTE_UNUSED void *cookie)
         {
        -    gt_pch_nx (&((*x)), op, cookie);
         }
        [...]

            gcc/
            PR middle-end/101204
            PR other/103157
            * diagnostic-spec.h (typedef xint_hash_t): Turn into...
            (struct xint_hash_t): ... this.
            * doc/gty.texi: Update.=