Check at configure time that LTO is supported by the C++ compiler bef…

…ore enabling it

src/main/CMakeLists.txt

@@ -1,13 +1,22 @@
 aux_source_directory(src MAIN_SRC)
 
+include(CheckIPOSupported)
+
 if(CCT_BUILD_EXEC)
   add_executable(coincenter ${MAIN_SRC})
 
-  # Enable LTO with coincenter in Release mode
-  if(CMAKE_BUILD_TYPE STREQUAL "Release")
-    set_property(TARGET coincenter PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
-    message(STATUS "Activate LTO for coincenter")
+  check_ipo_supported(RESULT result OUTPUT output LANGUAGES CXX)
+
+  if(result)
+    # Enable LTO with coincenter in Release mode
+    if(CMAKE_BUILD_TYPE STREQUAL "Release")
+      set_property(TARGET coincenter PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
+      message(STATUS "Activate LTO for coincenter")
+    endif()
+  else()
+    message(WARNING "IPO is not supported: ${output}")
   endif()
+
 else()
   list(REMOVE_ITEM ENGINE_SRC "src/main.cpp")
   add_library(coincenter STATIC ${MAIN_SRC})
@@ -27,4 +36,4 @@ add_unit_test(
   test/processcommandsfromcli_test.cpp
   LIBRARIES
   coincenter_engine
-)
+)