[bugfix][CompilerScript] Disable compiler output from compiler script.

Now an environment variable or cmake variable with the name
ALLOW_CXXFLAGS_OVERWRITE_VERBOSE has to be set to also get the output.

cmake/modules/OverloadCompilerFlags.cmake

@@ -30,6 +30,20 @@ include_guard(GLOBAL)
 option(ALLOW_CXXFLAGS_OVERWRITE OFF)
 option(ALLOW_CFLAGS_OVERWRITE OFF)
 option(ALLOW_CXXFLAGS_OVERWRITE_FORCE OFF)
+option(ALLOW_CXXFLAGS_OVERWRITE_VERBOSE OFF)
+option(ALLOW_CFLAGS_OVERWRITE_VERBOSE OFF)
+
+if( DEFINED ENV{ALLOW_CXXFLAGS_OVERWRITE_VERBOSE} )
+  set(ALLOW_CXXFLAGS_OVERWRITE_VERBOSE ON )
+endif()
+
+if( ALLOW_CXXFLAGS_OVERWRITE_VERBOSE )
+  set(ALLOW_CXXFLAGS_OVERWRITE ON)
+endif()
+
+if( ALLOW_CFLAGS_OVERWRITE_VERBOSE )
+  set(ALLOW_CFLAGS_OVERWRITE ON)
+endif()
 
 set(WRITE_CXXFLAGS_COMPILER_SCRIPT FALSE)
 # write scripts if CMAKE_GENERATOR is Makefiles or if FORCE is on
@@ -140,7 +154,12 @@ macro(finalize_compiler_script)
       set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\n  if [ \"\$VARNAME\" != \"\" ]; then\n    VAR=`\$ENV | \$GREP \$VARNAME`\n    if [ \"\$VAR\" != \"\" ]; then")
       set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\n      # add variable from environment to flags list\n      NEWFLAG=\"-D\$VARNAME=\${!VARNAME}\"\n    fi\n  fi")
       set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\n  FLAGS=\"\$FLAGS \$NEWFLAG\"\ndone")
-      set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\n\$ECHO \"${DEFAULT_${COMP}_COMPILER} \$${COMP}FLAGS \$FLAGS\"")
+      if( ${COMP} STREQUAL "CXX" AND ALLOW_CXXFLAGS_OVERWRITE_VERBOSE )
+        set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\n\$ECHO \"${DEFAULT_${COMP}_COMPILER} \$${COMP}FLAGS \$FLAGS\"")
+      endif()
+      if( ${COMP} STREQUAL "C" AND ALLOW_CFLAGS_OVERWRITE_VERBOSE )
+        set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\n\$ECHO \"${DEFAULT_${COMP}_COMPILER} \$${COMP}FLAGS \$FLAGS\"")
+      endif()
       set( COMPILER_SCRIPT_FILE "${COMPILER_SCRIPT_FILE}\nexec ${DEFAULT_${COMP}_COMPILER} \$${COMP}FLAGS \$FLAGS")
       message("-- Generating ${COMP} compiler script for ${COMP}FLAGS overloading on command line")
       if( ${COMP} STREQUAL "CXX" )