diff --git a/CMLibCompilerFlags.cmake b/CMLibCompilerFlags.cmake
index 9023444..d500308 100644
--- a/CMLibCompilerFlags.cmake
+++ b/CMLibCompilerFlags.cmake
@@ -18,18 +18,20 @@ macro(CHECK_ENABLE_CXX_FLAG flag)
 endmacro()
 
 macro(CHECK_ENABLE_DEBUG_CXX_FLAG flag)
-  set(CMAKE_REQUIRED_QUIET TRUE)
-  check_cxx_compiler_flag("${flag}" CHECK_CXX_FLAG_DEBUG)
-  unset(CMAKE_REQUIRED_QUIET)
+  if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    set(CMAKE_REQUIRED_QUIET TRUE)
+    check_cxx_compiler_flag("${flag}" CHECK_CXX_FLAG_DEBUG)
+    unset(CMAKE_REQUIRED_QUIET)
 
-  if(CHECK_CXX_FLAG_DEBUG)
-    message(STATUS "'${flag}': debug flag is supported.")
-    string(CONCAT _CMLIB_DETECTED_CXX_FLAGS_DEBUG "${_CMLIB_DETECTED_CXX_FLAGS_DEBUG} ${flag}")
-  else()
-    message(STATUS "'${flag}': debug flag is NOT supported.")
+    if(CHECK_CXX_FLAG_DEBUG)
+      message(STATUS "'${flag}': debug flag is supported.")
+      string(CONCAT _CMLIB_DETECTED_CXX_FLAGS_DEBUG "${_CMLIB_DETECTED_CXX_FLAGS_DEBUG} ${flag}")
+    else()
+      message(STATUS "'${flag}': debug flag is NOT supported.")
+    endif()
+    # NOTE: check_cxx_compiler stores variables in the cache.
+    unset(CHECK_CXX_FLAG_DEBUG CACHE)
   endif()
-  # NOTE: check_cxx_compiler stores variables in the cache.
-  unset(CHECK_CXX_FLAG_DEBUG CACHE)
 endmacro()
 
 function(cmlib_set_cxx_standard version)
diff --git a/CMLibDocBreathe.cmake b/CMLibDocBreathe.cmake
index 243e21d..ea2cf48 100644
--- a/CMLibDocBreathe.cmake
+++ b/CMLibDocBreathe.cmake
@@ -68,9 +68,11 @@ function(add_breathe_target target)
                                                               ${RST_FILES} ${WORK_DIR})
       endif()
     endif()
-    install(DIRECTORY ${CMAKE_BINARY_DIR}/doc/breathe/
-            COMPONENT doc OPTIONAL
-            DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/breathe)
+    install(
+      DIRECTORY ${CMAKE_BINARY_DIR}/doc/breathe/
+      COMPONENT doc
+      OPTIONAL
+      DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/breathe)
   else()
     message(STATUS "CMLIB warning:")
     add_custom_target(${target} VERBATIM COMMENT "  Breathe is not found. Skipping target ${target} build")
diff --git a/CMLibDocDoxygen.cmake b/CMLibDocDoxygen.cmake
index a1e2399..2d86e04 100644
--- a/CMLibDocDoxygen.cmake
+++ b/CMLibDocDoxygen.cmake
@@ -35,9 +35,11 @@ function(add_doxygen_target target)
       COMMAND ${DOXYGEN_EXECUTABLE} ${work_dir}/Doxyfile
       WORKING_DIRECTORY ${work_dir}
       COMMENT "Generating API documentation with Doxygen")
-    install(DIRECTORY ${CMAKE_BINARY_DIR}/doc/doxygen/html/
-            COMPONENT doc OPTIONAL
-            DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/doxygen)
+    install(
+      DIRECTORY ${CMAKE_BINARY_DIR}/doc/doxygen/html/
+      COMPONENT doc
+      OPTIONAL
+      DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/doxygen)
   else()
     message(STATUS "CMLIB warning:")
     add_custom_target(${target} VERBATIM COMMENT "  Doxygen is not found. Skipping target ${target} build")
diff --git a/CMLibQtTranslation.cmake b/CMLibQtTranslation.cmake
index 23260a9..a69c799 100644
--- a/CMLibQtTranslation.cmake
+++ b/CMLibQtTranslation.cmake
@@ -11,7 +11,7 @@ function(qt5_translation outfiles)
   set(_output_dir ${_QTTR_OUTPUT_DIR})
   set(_languages ${_QTTR_LANGUAGES})
 
-  set(_l10n_qrc_body "")
+  set(L10N_QRC_BODY "")
   make_directory(${_output_dir})
 
   foreach(lang ${_languages})
@@ -19,7 +19,7 @@ function(qt5_translation outfiles)
     set(_qm "${_base_name}_${lang}.qm")
     list(APPEND _ts_list ${_output_dir}/${_ts})
     list(APPEND _l10n_names_list "${_base_name}_l10n_${lang}")
-    string(APPEND _l10n_qrc_body "<file alias=\"${_qm}\">${CMAKE_BINARY_DIR}/${_qm}</file>\n")
+    string(APPEND L10N_QRC_BODY "<file alias=\"${_qm}\">${CMAKE_BINARY_DIR}/${_qm}</file>\n")
 
     add_custom_target(
       ${_base_name}_l10n_${lang} COMMAND ${Qt5_LUPDATE_EXECUTABLE} ${_sources} -ts ${_output_dir}/${_ts}