Use LTO only while building libraries.

CMake/VirtualFluidsMacros.cmake

@@ -131,18 +131,18 @@ function(vf_add_library)
     #################################################################
     ###   ADD TARGET                                              ###
     #################################################################
-    IF(${ARG_BUILDTYPE} MATCHES binary)
-        ADD_EXECUTABLE(${library_name} ${MY_SRCS} )
+    if(${ARG_BUILDTYPE} MATCHES binary)
+        add_executable(${library_name} ${MY_SRCS} )
         groupTarget(${library_name} ${appFolder})
-    ELSEIF(${ARG_BUILDTYPE} MATCHES shared)
-        ADD_LIBRARY(${library_name} SHARED ${MY_SRCS} )
+    elseif(${ARG_BUILDTYPE} MATCHES shared)
+        add_library(${library_name} SHARED ${MY_SRCS} )
         groupTarget(${library_name} ${libraryFolder})
-    ELSEIF(${ARG_BUILDTYPE} MATCHES static)
-        ADD_LIBRARY(${library_name} STATIC ${MY_SRCS} )
+        elseif(${ARG_BUILDTYPE} MATCHES static)
+        add_library(${library_name} STATIC ${MY_SRCS} )
         groupTarget(${library_name} ${libraryFolder})
-    ELSE()
-        MESSAGE(FATAL_ERROR "build_type=${ARG_BUILDTYPE} doesn't match BINARY, SHARED or STATIC")
-    ENDIF()
+    else()
+        message(FATAL_ERROR "build_type=${ARG_BUILDTYPE} doesn't match BINARY, SHARED or STATIC")
+    endif()
 
     # Set the output directory for build artifacts
     set_target_properties(${library_name}
@@ -153,14 +153,16 @@ function(vf_add_library)
             PDB_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
 
     # link time optimization
-    include(CheckIPOSupported)
-    check_ipo_supported(RESULT ipo_supported OUTPUT ipo_error)
+    if(NOT ${ARG_BUILDTYPE} MATCHES binary)
+        include(CheckIPOSupported)
+        check_ipo_supported(RESULT ipo_supported OUTPUT ipo_error)
 
-    if( ipo_supported )
-        status_lib("IPO / LTO enabled")
-        set_target_properties(${library_name} PROPERTIES INTERPROCEDURAL_OPTIMIZATION TRUE)
-    else()
-        status_lib("IPO / LTO not supported: <${ipo_error}>")
+        if( ipo_supported )
+            status_lib("IPO / LTO enabled")
+            set_target_properties(${library_name} PROPERTIES INTERPROCEDURAL_OPTIMIZATION TRUE)
+        else()
+            status_lib("IPO / LTO not supported: <${ipo_error}>")
+        endif()
     endif()
 
     # clang-tidy