Set CXX standard when H5PP_PACKAGE_MANAGER=fetch

DavidAce · Jun 1, 2021 · 8ee6dd4 · 8ee6dd4
1 parent 5b1783d
commit 8ee6dd4
Showing 1 changed file with 10 additions and 3 deletions.
diff --git a/cmake/SetupDependenciesFetch.cmake b/cmake/SetupDependenciesFetch.cmake
@@ -1,8 +1,15 @@
 if(H5PP_PACKAGE_MANAGER MATCHES "fetch")
 
-    set(CMAKE_CXX_STANDARD 17)
-    set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
-    set(CMAKE_CXX_EXTENSIONS FALSE)
+
+    if(NOT CMAKE_CXX_STANDARD)
+        set(CMAKE_CXX_STANDARD 17)
+    endif()
+    if(NOT CMAKE_CXX_STANDARD_REQUIRED)
+        set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
+    endif()
+    if(NOT CMAKE_CXX_EXTENSIONS)
+        set(CMAKE_CXX_EXTENSIONS FALSE)
+    endif()
 
 
     if(H5PP_ENABLE_EIGEN3)