Scripts: Three modes of warning printing.

WARN_MODE=early
print warnings at compilation stage

WARN_MODE=late
print warnings at build finish stage

WARN_MODE=both
print both at early and at later stages

BUILD/capture_warnings.sh

 #!/bin/bash
-
 warn_path=$1
-shift
+warn_mode=$2
+shift 2
+
 warn_file="$warn_path/compile.warnings"
 suppress_file="$warn_path/suppress.warnings"
 
@@ -10,7 +11,8 @@ cmderr=$("$@" 2>&1 1>&3)
 error=$?
 
 if [[ -n "$cmderr" ]]; then
-    echo "$cmderr" >&2
+    [[ "$warn_mode" == "both" ]] &&
+        echo "$cmderr" >&2
     [[ "$cmderr" =~ warning:(.+)$ ]] &&
         echo -n "$cmderr" >> "$warn_file"
 fi

cmake/print_warnings.cmake

-IF (NOT DEFINED WITHOUT_REPRINT AND CMAKE_BUILD_TYPE MATCHES "Debug")
+IF(NOT DEFINED WARN_MODE)
+  IF(CMAKE_BUILD_TYPE MATCHES "Debug")
+    SET(WARN_MODE "late")
+  ELSE()
+    SET(WARN_MODE "early")
+  ENDIF()
+ENDIF()
+
+IF(NOT WARN_MODE STREQUAL "early" AND
+    NOT WARN_MODE STREQUAL "late" AND
+    NOT WARN_MODE STREQUAL "both")
+  MESSAGE(FATAL_ERROR "Unknown WARN_MODE: expected 'early', 'late' or 'both'")
+ENDIF()
+
+IF(NOT WARN_MODE MATCHES "early")
   SET_DIRECTORY_PROPERTIES(PROPERTIES RULE_LAUNCH_COMPILE
-    "bash ${CMAKE_SOURCE_DIR}/BUILD/capture_warnings.sh ${CMAKE_BINARY_DIR}")
+    "bash ${CMAKE_SOURCE_DIR}/BUILD/capture_warnings.sh ${CMAKE_BINARY_DIR} ${WARN_MODE}")
   SET_DIRECTORY_PROPERTIES(PROPERTY ADDITIONAL_MAKE_CLEAN_FILES
     "${CMAKE_BINARY_DIR}/compile.warnings")
   ADD_CUSTOM_TARGET(rm_compile.warnings ALL