[gcc(refs/vendors/ARM/heads/arm-perf-staging)] Fortran : ICE in gfc_trans_label_assign PR50392

[Tamar Christina]

https://gcc.gnu.org/g:4e2c7f9a29c212db4bf428799a2d62f79f392511

commit 4e2c7f9a29c212db4bf428799a2d62f79f392511
Author: Mark Eggleston <markeggleston@gcc.gnu.org>
Date:   Thu May 7 08:15:26 2020 +0100

    Fortran  : ICE in gfc_trans_label_assign PR50392
    
    A function may contain an assigned goto.  If the the return variable
    is an integer a statement can be assigned to it.  Prior to this fix
    this resulted in an ICE.
    
    2020-05-28  Tobias Burnus  <tobias@codesourcery.com>
    
    gcc/fortran/
    
            PR fortran/50392
            * trans-decl.c (gfc_get_symbol_decl): Remove unnecessary block
            delimiters.  Add auxiliary variables if a label is assigned to
            a return variable. (gfc_gat_fake_result): If the symbol has an
            assign attribute set declaration from the symbol's backend
            declaration.
    
    2020-05-28  Mark Eggleston  <markeggleston@gnu.gcc.org>
    
    gcc/testsuite/
    
            PR fortran/50392
            * gfortran.dg/pr50392.f: New test.
    
    (cherry picked from commit a7fd43c38f7469a3ef5ee30e889d60e1376d4dfc)

Diff:
---
 gcc/fortran/trans-decl.c            | 11 ++++++++---
 gcc/testsuite/gfortran.dg/pr50392.f | 12 ++++++++++++
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index 487e776f5dd..e10122e6e0c 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -1682,9 +1682,7 @@ gfc_get_symbol_decl (gfc_symbol * sym)
 
       TREE_USED (sym->backend_decl) = 1;
       if (sym->attr.assign && GFC_DECL_ASSIGN (sym->backend_decl) == 0)
-	{
-	  gfc_add_assign_aux_vars (sym);
-	}
+	gfc_add_assign_aux_vars (sym);
 
       if (sym->ts.type == BT_CLASS && sym->backend_decl)
 	GFC_DECL_CLASS(sym->backend_decl) = 1;
@@ -1692,6 +1690,10 @@ gfc_get_symbol_decl (gfc_symbol * sym)
      return sym->backend_decl;
     }
 
+  if (sym->result == sym && sym->attr.assign
+      && GFC_DECL_ASSIGN (sym->backend_decl) == 0)
+    gfc_add_assign_aux_vars (sym);
+
   if (sym->backend_decl)
     return sym->backend_decl;
 
@@ -3196,6 +3198,9 @@ gfc_get_fake_result_decl (gfc_symbol * sym, int parent_flag)
   else
     current_fake_result_decl = build_tree_list (NULL, decl);
 
+  if (sym->attr.assign)
+    DECL_LANG_SPECIFIC (decl) = DECL_LANG_SPECIFIC (sym->backend_decl);
+
   return decl;
 }
 
diff --git a/gcc/testsuite/gfortran.dg/pr50392.f b/gcc/testsuite/gfortran.dg/pr50392.f
new file mode 100644
index 00000000000..2cb883e41a3
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr50392.f
@@ -0,0 +1,12 @@
+! { dg-do compile }
+! 
+      function kf()
+      integer kf
+      assign 1 to kf ! { dg-warning "Deleted feature: ASSIGN statement at" }
+      kf = 2
+      goto kf ! { dg-warning "Deleted feature: Assigned GOTO statement at" }
+      kf = 1
+ 1    continue
+      kf = 0
+      end
+