[Bug build/27579] stap-probe.c : Invalid use of incomplete type ‘struct std::hash<exp_opcode>’

["vvinayag at arm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27579

--- Comment #4 from vvinayag at arm dot com ---
Hi Tom,

The previous patch fixes stap-probe.c and then the same issue happens in
gdb/rust-exp.y. I will try the new patch.

In file included from /usr/include/c++/4.8.2/bits/hashtable.h:35:0,
                 from /usr/include/c++/4.8.2/unordered_map:47,
                 from /src/binutils-gdb--gdb/gdb/rust-exp.y:45:
/usr/include/c++/4.8.2/bits/hashtable_policy.h: In instantiation of ‘struct
std::__detail::_Hash_code_base<exp_opcode, std::pair<const exp_opcode,
std::unique_ptr<expr::operation> (*)(std::unique_ptr<expr::operation>&&,
std::unique_ptr<expr::operation>&&)>, std::__detail::_Select1st,
std::hash<exp_opcode>, std::__detail::_Mod_range_hashing,
std::__detail::_Default_ranged_hash, true>’:

/usr/include/c++/4.8.2/bits/hashtable_policy.h:1402:10:   required from ‘struct
std::__detail::_Hashtable_base<exp_opcode, std::pair<const exp_opcode,
std::unique_ptr<expr::operation> (*)(std::unique_ptr<expr::operation>&&,
std::unique_ptr<expr::operation>&&)>, std::__detail::_Select1st,
std::equal_to<exp_opcode>, std::hash<exp_opcode>,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Hashtable_traits<true, false, true> >’

/usr/include/c++/4.8.2/bits/hashtable.h:174:11:   required from ‘class
std::_Hashtable<exp_opcode, std::pair<const exp_opcode,
std::unique_ptr<expr::operation> (*)(std::unique_ptr<expr::operation>&&,
std::unique_ptr<expr::operation>&&)>, std::allocator<std::pair<const
exp_opcode, std::unique_ptr<expr::operation>
(*)(std::unique_ptr<expr::operation>&&, std::unique_ptr<expr::operation>&&)> >,
std::__detail::_Select1st, std::equal_to<exp_opcode>, std::hash<exp_opcode>,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true,
false, true> >’

/usr/include/c++/4.8.2/bits/unordered_map.h:100:18:   required from ‘class
std::unordered_map<exp_opcode, std::unique_ptr<expr::operation>
(*)(std::unique_ptr<expr::operation>&&, std::unique_ptr<expr::operation>&&)>’

/src/binutils-gdb--gdb/gdb/rust-exp.y:2205:60:   required from here
/usr/include/c++/4.8.2/bits/hashtable_policy.h:1070:12: error: invalid use of
incomplete type ‘struct std::hash<exp_opcode>’
     struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
            ^
In file included from /usr/include/c++/4.8.2/bits/basic_string.h:3033:0,
                 from /usr/include/c++/4.8.2/string:52,
                 from /usr/include/c++/4.8.2/stdexcept:39,
                 from /usr/include/c++/4.8.2/array:38,
                 from /usr/include/c++/4.8.2/tuple:39,
                 from /usr/include/c++/4.8.2/functional:55,
                 from /src/binutils-gdb--gdb/gdb/../gdbsupport/ptid.h:35,
                 from
/src/binutils-gdb--gdb/gdb/../gdbsupport/common-defs.h:123,
                 from /src/binutils-gdb--gdb/gdb/defs.h:28,
                 from /src/binutils-gdb--gdb/gdb/rust-exp.y:32:
/usr/include/c++/4.8.2/bits/functional_hash.h:58:12: error: declaration of
‘struct std::hash<exp_opcode>’
     struct hash;

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