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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/100656] ICE in gfc_conv_expr_present, at
 fortran/trans-expr.c:1934
Date: Tue, 25 May 2021 21:05:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100656

--- Comment #3 from anlauf at gcc dot gnu.org ---
The following patch seems to fix the issue:

diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index 6d38ea78273..7eeef554c0f 100644
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -4718,8 +4718,9 @@ done:

          /* For optional arguments, only check bounds if the argument is
             present.  */
-         if (expr->symtree->n.sym->attr.optional
-             || expr->symtree->n.sym->attr.not_always_present)
+         if ((expr->symtree->n.sym->attr.optional
+              || expr->symtree->n.sym->attr.not_always_present)
+             && expr->symtree->n.sym->attr.dummy)
            tmp =3D build3_v (COND_EXPR,
                            gfc_conv_expr_present (expr->symtree->n.sym),
                            tmp, build_empty_stmt (input_location));

If I understand the code correctly, the issue arises since we try to genera=
te
runtime checks for a compiler generated temporary that is not a dummy, thus
hitting the assert in gfc_conv_expr_present.=