Don't use GLIBCXX_ASSERTIONS in production

Closes #627 (closed)

I assumed that this flag GLIBCXX_ASSERTIONS has no effect when the build type is Release. However I did some timing measurements and observed an increase of ~6 percent when using. This is fine for development builds but not for production.

ippl/CMakeLists.txt

@@ -6,7 +6,7 @@ set (IPPL_VERSION_NAME "V${IPPL_VERSION_MAJOR}.${IPPL_VERSION_MINOR}")
 
 set (IPPL_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 
-if (${CMAKE_BUILD_TYPE} STREQUAL "Release")
+if (${BUILD_FOR_PRODUCTION})
     add_definitions (-DNOPAssert)
 endif ()
 
@@ -28,5 +28,4 @@ install (
     FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config_install.cmake
     DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/cmake/${PROJECT_NAME}"
     RENAME ${PROJECT_NAME}Config.cmake
-    )
-
+    )
\ No newline at end of file