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lalr1.cc: declare stack_symbol_type as noexcept

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Many C++ tests (400-25, 440-53, 664-5, 667-76, 679-80, 682-3, 685-9,
692) failed with GCC 12.1:

```
test.cc:843:28:   required from here
/opt/local/include/gcc12/c++/bits/stl_construct.h:95:14: error: noexcept-expression evaluates to 'false' because of a call to 'yy::parser::stack_symbol_type::stack_symbol_type()' [-Werror=noexcept]
   95 |     noexcept(noexcept(::new((void*)0) _Tp(std::declval<_Args>()...)))
      |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.cc:990:3: note: but 'yy::parser::stack_symbol_type::stack_symbol_type()' does not throw; perhaps it should be declared 'noexcept'
  990 |   parser::stack_symbol_type::stack_symbol_type ()
      |   ^~~~~~
```

Reported by Paul Eggert.
<https://lists.gnu.org/r/bison-patches/2022-07/msg00008.html>

* data/skeletons/lalr1.cc (stack_symbol_type::stack_symbol_type()):
Declare noexcept.
This commit is contained in:
Akim Demaille
2022-08-01 07:08:52 +02:00
parent 657dbff05c
commit 722070124e
1 changed files with 2 additions and 2 deletions
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4
data/skeletons/lalr1.cc
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@@ -425,7 +425,7 @@ m4_define([b4_shared_declarations],
/// Superclass.
typedef basic_symbol<by_state> super_type;
/// Construct an empty symbol.
stack_symbol_type ();
stack_symbol_type () YY_NOEXCEPT;
/// Move or copy construction.
stack_symbol_type (YY_RVREF (stack_symbol_type) that);
/// Steal the contents from \a sym to build this.
@@ -678,7 +678,7 @@ m4_if(b4_prefix, [yy], [],
return YY_CAST (symbol_kind_type, yystos_[+state]);
}
]b4_parser_class[::stack_symbol_type::stack_symbol_type ()
]b4_parser_class[::stack_symbol_type::stack_symbol_type () YY_NOEXCEPT
{}
]b4_parser_class[::stack_symbol_type::stack_symbol_type (YY_RVREF (stack_symbol_type) that)