I _think_ this is a decent compromise for LTO vs non-LTO builds

CMakeLists.txt

@@ -154,20 +154,30 @@ set(THREADS_PREFER_PTHREAD_FLAG TRUE)
 find_package(Threads REQUIRED)
 
 # not supported on Solaris - system libraries are not available as archives
+# LTO is supported only for native builds
 if(STATIC_LINK_RUNTIME)
   if (NOT SOLARIS)
-    add_compile_options(-static -flto)
+    if(NOT CMAKE_CROSSCOMPILING)
+      add_compile_options(-static -flto)
+    else()
+      add_compile_options(-static)
+    endif()
     if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
       link_libraries( -static -static-libstdc++ -pthread -flto )
     else()
-      # this is messing with release builds
-      add_compile_options(-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0)
-      set(CMAKE_AR "gcc-ar")
-      set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> qcs <TARGET> <LINK_FLAGS> <OBJECTS>")
-      set(CMAKE_C_ARCHIVE_FINISH "true")
-      set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> qcs <TARGET> <LINK_FLAGS> <OBJECTS>")
-      set(CMAKE_CXX_ARCHIVE_FINISH "true")
-      link_libraries( -flto -static-libstdc++ -static-libgcc -static -Wl,--whole-archive -lpthread -Wl,--no-whole-archive )
+      if(NOT CMAKE_CROSSCOMPILING)
+        # this is messing with release builds
+        add_compile_options(-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0)
+        set(CMAKE_AR "gcc-ar")
+        set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> qcs <TARGET> <LINK_FLAGS> <OBJECTS>")
+        set(CMAKE_C_ARCHIVE_FINISH "true")
+        set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> qcs <TARGET> <LINK_FLAGS> <OBJECTS>")
+        set(CMAKE_CXX_ARCHIVE_FINISH "true")
+        link_libraries( -flto -static-libstdc++ -static-libgcc -static -Wl,--whole-archive -lpthread -Wl,--no-whole-archive )
+      else()
+        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libstdc++ -static-libgcc -static -Wl,--whole-archive -lpthread -Wl,--no-whole-archive" )
+        set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
+      endif()
     endif()
   else()
       link_libraries( -static-libstdc++ -static-libgcc )