Re: [sr #110032] For C++98 stack_symbol_type defines only non-const operator=

[Akim Demaille]

I pushed this in maint, and merge it in master.  Thanks!

commit 406e8c7c02daf1b74eeacf9831763ceec128ab9b
Author: Akim Demaille <address@hidden>
Date:   Wed Sep 25 19:34:34 2019 +0200

    c++: add copy ctors for compatibility with the IAR compiler
    
    Reported by Andreas Damm.
    https://savannah.gnu.org/support/?110032
    
    * data/skeletons/lalr1.cc (stack_symbol_type::operator=): New
    overload, const, to please the IAR C++ compiler (version ca 2013).

diff --git a/THANKS b/THANKS
index 4d2b25f7..2cdd9b0b 100644
--- a/THANKS
+++ b/THANKS
@@ -10,6 +10,7 @@ Albert Chin-A-Young       address@hidden
 Alexander Belopolsky      address@hidden
 Alexandre Duret-Lutz      address@hidden
 Andre da Costa Barros     address@hidden
+Andreas Damm              address@hidden
 Andreas Schwab            address@hidden
 Andrew Suffield           address@hidden
 Angelo Borsotti           address@hidden
diff --git a/data/skeletons/lalr1.cc b/data/skeletons/lalr1.cc
index d1c30403..3e1ac445 100644
--- a/data/skeletons/lalr1.cc
+++ b/data/skeletons/lalr1.cc
@@ -335,6 +335,10 @@ m4_define([b4_shared_declarations],
       /// Assignment, needed by push_back by some old implementations.
       /// Moves the contents of that.
       stack_symbol_type& operator= (stack_symbol_type& that);
+
+      /// Assignment, needed by push_back by other implementations.
+      /// Needed by some other old implementations.
+      stack_symbol_type& operator= (const stack_symbol_type& that);
 #endif
     };
 
@@ -627,6 +631,17 @@ m4_if(b4_prefix, [yy], [],
   }
 
 #if YY_CPLUSPLUS < 201103L
+  ]b4_parser_class[::stack_symbol_type&
+  ]b4_parser_class[::stack_symbol_type::operator= (const stack_symbol_type& 
that)
+  {
+    state = that.state;
+    ]b4_variant_if([b4_symbol_variant([that.type_get ()],
+                                      [value], [copy], [that.value])],
+                   [[value = that.value;]])[]b4_locations_if([
+    location = that.location;])[
+    return *this;
+  }
+
   ]b4_parser_class[::stack_symbol_type&
   ]b4_parser_class[::stack_symbol_type::operator= (stack_symbol_type& that)
   {