From 3fa56584b92f59ac244c6ca4e56d080d3d0f3f3c Mon Sep 17 00:00:00 2001
From: Iain Russell <Iain.Russell@ecmwf.int>
Date: Tue, 19 Dec 2023 15:56:12 +0000
Subject: [PATCH] Tighten up test for std::filesystem with gcc 7.5 [MAGP-1356]

---
 src/web/MagConfig.cc | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/web/MagConfig.cc b/src/web/MagConfig.cc
index 8691cde0..d07cf41b 100644
--- a/src/web/MagConfig.cc
+++ b/src/web/MagConfig.cc
@@ -18,7 +18,15 @@
 #include "Value.h"
 
 
-#if ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || __cplusplus >= 201703L)
+#define STD_FILESYSTEM_INCLUDE_MISSING 0
+#ifdef __has_include
+    #if !__has_include(<filesystem>)
+        #define STD_FILESYSTEM_INCLUDE_MISSING 1
+    #endif
+#endif
+
+
+#if ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || (__cplusplus >= 201703L) && !STD_FILESYSTEM_INCLUDE_MISSING)
 #include <filesystem>
 namespace fs = std::filesystem;
 #else
@@ -579,4 +587,4 @@ bool PaletteLibrary::find(string& name, Palette& out) {
     }
     return false;
         
-}
\ No newline at end of file
+}