From 033a4b12a5e5f67f2f00c23885a3ff04acbeb4cd Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Sat, 14 Dec 2019 13:28:22 -0500
Subject: bootstrap: Extend C++17 check for our cast functions

In commit fc3b4caa2e (Memory management: cast functions for managed pointers,
2019-11-18) we added a check to `Source/Checks/cm_cxx17_check.cpp` to avoid
using C++17 mode on a compiler that does not support all our C++17 usage.
Add the check to our bootstrap script too.
---
 bootstrap | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/bootstrap b/bootstrap
index 6e89589..1b0cb26 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1168,10 +1168,20 @@ int check_cxx14()
 }
 #endif
 
-#if __cplusplus >= 201703L
+#if (__cplusplus >= 201703L || defined(__INTEL_COMPILER) && defined(__cpp_if_constexpr))
 #include <optional>
+template <typename T,
+          typename std::invoke_result<decltype(&T::get), T>::type = nullptr>
+typename T::pointer get_ptr(T& item)
+{
+  return item.get();
+}
+
 int check_cxx17()
 {
+  // Intel compiler do not handle correctly 'decltype' inside 'invoke_result'
+  std::unique_ptr<int> u(new int(0));
+  get_ptr(u);
   std::optional<int> oi = 0;
   return oi.value();
 }
-- 
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