From 5334e2ba947e5f606cab63446730198e31d6038d Mon Sep 17 00:00:00 2001
From: Daniel Lemire <daniel@lemire.me>
Date: Sun, 28 Jan 2024 10:55:02 -0500
Subject: [PATCH] fix

---
 tests/CMakeLists.txt | 1 +
 tests/fast_int.cpp   | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 26e4368..a7c8342 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -72,6 +72,7 @@ fast_float_add_cpp_test(long_test)
 fast_float_add_cpp_test(powersoffive_hardround)
 fast_float_add_cpp_test(string_test)
 fast_float_add_cpp_test(fast_int)
+target_compile_features(fast_int PRIVATE cxx_std_17)
 fast_float_add_cpp_test(json_fmt)
 fast_float_add_cpp_test(fortran)
 
diff --git a/tests/fast_int.cpp b/tests/fast_int.cpp
index 0783371..8ef7784 100644
--- a/tests/fast_int.cpp
+++ b/tests/fast_int.cpp
@@ -1,3 +1,4 @@
+#if defined(__cplusplus) && (__cplusplus >= 201703L)
 #include <cstdlib>
 #include <iostream>
 #include <vector>
@@ -741,4 +742,10 @@ int main() {
   }
 
   return EXIT_SUCCESS;
-}
\ No newline at end of file
+}
+#else
+int main() {
+  std::cerr << "The test requires C++17." << std::endl;
+  return EXIT_SUCCESS;
+}
+#endif
\ No newline at end of file