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

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
That does seem like a better way.

diff --git a/gdb/stap-probe.c b/gdb/stap-probe.c
index 5995c2824dc..7f6d98a8ef2 100644
--- a/gdb/stap-probe.c
+++ b/gdb/stap-probe.c
@@ -38,6 +38,7 @@
 #include "elf-bfd.h"
 #include "expop.h"
 #include <unordered_map>
+#include "gdbsupport/hash_enum.h"

 #include <ctype.h>

@@ -436,7 +437,8 @@ typedef expr::operation_up binop_maker_ftype
(expr::operation_up &&,
                                              expr::operation_up &&);
 /* Map from an expression opcode to a function that can create a
    binary operation of that type.  */
-static std::unordered_map<exp_opcode, binop_maker_ftype *> stap_maker_map;
+static std::unordered_map<exp_opcode, binop_maker_ftype *,
+                         gdb::hash_enum<exp_opcode>> stap_maker_map;

 /* Helper function to create a binary operation.  */
 static expr::operation_up

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