From 276d3c7afe45f26232cf1e9664ad34037d28a52a Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 31 Jul 2018 09:27:29 -0400
Subject: IWYU: Add workaround mapping for std::hash

When using GCC 8's standard library IWYU thinks that `<system_error>`
must be included to get `std::hash`.  Add a mapping for `<utility>`.
---
 Source/cmServerProtocol.cxx | 1 +
 Utilities/IWYU/mapping.imp  | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Source/cmServerProtocol.cxx b/Source/cmServerProtocol.cxx
index c267160..b05eac4 100644
--- a/Source/cmServerProtocol.cxx
+++ b/Source/cmServerProtocol.cxx
@@ -37,6 +37,7 @@
 #include <set>
 #include <string>
 #include <unordered_map>
+#include <utility>
 #include <vector>
 
 // Get rid of some windows macros:
diff --git a/Utilities/IWYU/mapping.imp b/Utilities/IWYU/mapping.imp
index 892cdcb..77bb572 100644
--- a/Utilities/IWYU/mapping.imp
+++ b/Utilities/IWYU/mapping.imp
@@ -52,6 +52,9 @@
   #{ symbol: [ "std::pair", private, "<map>", public ] },
   #{ symbol: [ "std::pair", private, "<set>", public ] },
 
+  # HACK: iwyu wrongly thinks that <system_error> is needed for std::hash
+  { symbol: [ "std::hash", private, "<utility>", public ] },
+
   # __decay_and_strip is used internally in the C++11 standard library.
   # IWYU does not classify it as internal and suggests to add <type_traits>.
   # To ignore it, we simply map it to a file that is included anyway.
-- 
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