diff --git a/compilers/Clang.CXX.cmake b/compilers/Clang.CXX.cmake
index a2699a1..0d0998a 100644
--- a/compilers/Clang.CXX.cmake
+++ b/compilers/Clang.CXX.cmake
@@ -1,5 +1,5 @@
 if(CMAKE_CXX_COMPILER_ID MATCHES Clang)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unknown-pragmas -Wno-sign-compare -Woverloaded-virtual -Wwrite-strings -Wno-unused")
-    set(CMAKE_CXX_FLAGS_RELEASE "-Ofast -march=native -DNDEBUG -Wno-unused")
+    set(CMAKE_CXX_FLAGS_RELEASE "-Ofast -march=native -DNDEBUG")
     set(CMAKE_CXX_FLAGS_DEBUG "-O0 -DDEBUG -g")
 endif()
diff --git a/compilers/GNU.CXX.cmake b/compilers/GNU.CXX.cmake
index 3662746..768abd1 100644
--- a/compilers/GNU.CXX.cmake
+++ b/compilers/GNU.CXX.cmake
@@ -1,5 +1,5 @@
 if(CMAKE_CXX_COMPILER_ID MATCHES GNU)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unknown-pragmas -Wno-sign-compare -Woverloaded-virtual -Wwrite-strings -Wno-unused")
-    set(CMAKE_CXX_FLAGS_RELEASE "-Ofast -march=native -DNDEBUG -Wno-unused")
+    set(CMAKE_CXX_FLAGS_RELEASE "-Ofast -march=native -DNDEBUG")
     set(CMAKE_CXX_FLAGS_DEBUG "-O0 -DDEBUG -g")
 endif()
diff --git a/modules/CheckFortranSourceCompiles.cmake b/modules/CheckFortranSourceCompiles.cmake
deleted file mode 100644
index 38ad164..0000000
--- a/modules/CheckFortranSourceCompiles.cmake
+++ /dev/null
@@ -1,111 +0,0 @@
-#.rst:
-# CheckFortranSourceCompiles
-# --------------------------
-#
-# Check if given Fortran source compiles and links into an executable::
-#
-#   CHECK_Fortran_SOURCE_COMPILES(<code> <var> [FAIL_REGEX <fail-regex>])
-#
-# The arguments are:
-#
-# ``<code>``
-#   Source code to try to compile.  It must define a PROGRAM entry point.
-# ``<var>``
-#   Variable to store whether the source code compiled.
-#   Will be created as an internal cache variable.
-# ``<fail-regex>``
-#   Fail if test output matches this regex.
-#
-# The following variables may be set before calling this macro to modify
-# the way the check is run::
-#
-#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
-#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
-#   CMAKE_REQUIRED_INCLUDES = list of include directories
-#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
-#   CMAKE_REQUIRED_QUIET = execute quietly without messages
-
-#=============================================================================
-# Copyright 2005-2009 Kitware, Inc.
-#
-# Distributed under the OSI-approved BSD License (the "License");
-# see accompanying file Copyright.txt for details.
-#
-# This software is distributed WITHOUT ANY WARRANTY; without even the
-# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-# See the License for more information.
-#=============================================================================
-# (To distribute this file outside of CMake, substitute the full
-#  License text for the above reference.)
-
-
-
-macro(CHECK_Fortran_SOURCE_COMPILES SOURCE VAR)
-  if(NOT DEFINED "${VAR}")
-    set(_FAIL_REGEX)
-    set(_key)
-    foreach(arg ${ARGN})
-      if("${arg}" MATCHES "^(FAIL_REGEX)$")
-        set(_key "${arg}")
-      elseif(_key)
-        list(APPEND _${_key} "${arg}")
-      else()
-        message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
-      endif()
-    endforeach()
-    set(MACRO_CHECK_FUNCTION_DEFINITIONS
-      "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
-    if(CMAKE_REQUIRED_LIBRARIES)
-      set(CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES
-        LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
-    else()
-      set(CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES)
-    endif()
-    if(CMAKE_REQUIRED_INCLUDES)
-      set(CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES
-        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
-    else()
-      set(CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES)
-    endif()
-    file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.F90"
-      "${SOURCE}\n")
-
-    if(NOT CMAKE_REQUIRED_QUIET)
-      message(STATUS "Performing Test ${VAR}")
-    endif()
-    try_compile(${VAR}
-      ${CMAKE_BINARY_DIR}
-      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.F90
-      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
-      ${CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES}
-      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
-      "${CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES}"
-      OUTPUT_VARIABLE OUTPUT)
-
-    foreach(_regex ${_FAIL_REGEX})
-      if("${OUTPUT}" MATCHES "${_regex}")
-        set(${VAR} 0)
-      endif()
-    endforeach()
-
-    if(${VAR})
-      set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
-      if(NOT CMAKE_REQUIRED_QUIET)
-        message(STATUS "Performing Test ${VAR} - Success")
-      endif()
-      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
-        "Performing Fortran SOURCE FILE Test ${VAR} succeded with the following output:\n"
-        "${OUTPUT}\n"
-        "Source file was:\n${SOURCE}\n")
-    else()
-      if(NOT CMAKE_REQUIRED_QUIET)
-        message(STATUS "Performing Test ${VAR} - Failed")
-      endif()
-      set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
-      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
-        "Performing Fortran SOURCE FILE Test ${VAR} failed with the following output:\n"
-        "${OUTPUT}\n"
-        "Source file was:\n${SOURCE}\n")
-    endif()
-  endif()
-endmacro()
diff --git a/modules/UseCodeCoverage.cmake b/modules/UseCodeCoverage.cmake
index 9a4a06d..68e71fc 100644
--- a/modules/UseCodeCoverage.cmake
+++ b/modules/UseCodeCoverage.cmake
@@ -7,6 +7,12 @@ if(ENABLE_CODE_COVERAGE)
         endif()
     endif()
 
+    if(DEFINED CMAKE_C_COMPILER_ID)
+        if(CMAKE_C_COMPILER_ID MATCHES GNU)
+            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fprofile-arcs -ftest-coverage")
+        endif()
+    endif()
+
     if(DEFINED CMAKE_CXX_COMPILER_ID)
         if(CMAKE_CXX_COMPILER_ID MATCHES GNU)
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")