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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/103507] ICE in resolve_block_construct, at
 fortran/resolve.c:10787
Date: Wed, 01 Dec 2021 15:00:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103507

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #2 from kargl at gcc dot gnu.org ---
This patch prevents the ICE, but is not as elegant as I would like.

diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index f074a0ab3a1..08f657407da 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -17553,6 +17553,14 @@ gfc_resolve (gfc_namespace *ns)
   code_stack *old_cs_base;
   struct gfc_omp_saved_state old_omp_state;

+  if (!ns)
+    {
+      int ecnt;
+      gfc_get_errors (NULL, &ecnt);
+      if (ecnt > 0)
+       gfc_fatal_error ("Namespace corruption due to previous errors");
+    }
+
   if (ns->resolved)
     return;

The problem seems to be with one of more namespaces being
incomplete and/or overlapping.=