From 00591a8652cbde31081b033b05834bb71f0ebb97 Mon Sep 17 00:00:00 2001
From: Daniel Lemire <lemire@gmail.com>
Date: Wed, 27 Jan 2021 20:24:56 -0500
Subject: [PATCH] Sane systems should have filesystem

---
 tests/basictest.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/basictest.cpp b/tests/basictest.cpp
index 7abcc9e..925b00c 100644
--- a/tests/basictest.cpp
+++ b/tests/basictest.cpp
@@ -26,6 +26,16 @@
 #if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MINGW64__) || defined(sun) || defined(__sun)
 #define FASTFLOAT_ODDPLATFORM 1
 #endif
+
+#if defined __has_include
+#if __has_include (<filesystem>)
+#else
+#define FASTFLOAT_ODDPLATFORM 1
+#endif
+#else
+#define FASTFLOAT_ODDPLATFORM 1
+#endif
+
 // C++ 17 because it is otherwise annoying to browse all files in a directory.
 // We also only run these tests on little endian systems.
 #if (FASTFLOAT_CPLUSPLUS >= 201703L) && (FASTFLOAT_IS_BIG_ENDIAN == 0) && !defined(FASTFLOAT_ODDPLATFORM)