cmake: fix ocv_check_compiler_flag

cmake/OpenCVUtils.cmake

@@ -199,7 +199,7 @@ set(OCV_COMPILER_FAIL_REGEX
     "[Uu]nknown option"                         # HP
     "[Ww]arning: [Oo]ption"                     # SunPro
     "command option .* is not recognized"       # XL
-    "not supported in this configuration; ignored"       # AIX
+    "not supported in this configuration, ignored"       # AIX (';' is replaced with ',')
     "File with unknown suffix passed to linker" # PGI
     "WARNING: unknown flag:"                    # Open64
   )
@@ -238,12 +238,25 @@ MACRO(ocv_check_compiler_flag LANG FLAG RESULT)
         COMPILE_DEFINITIONS "${FLAG}"
         OUTPUT_VARIABLE OUTPUT)
 
-      FOREACH(_regex ${OCV_COMPILER_FAIL_REGEX})
-        IF("${OUTPUT}" MATCHES "${_regex}")
-          SET(${RESULT} 0)
+      if(${RESULT})
+        string(REPLACE ";" "," OUTPUT_LINES "${OUTPUT}")
+        string(REPLACE "\n" ";" OUTPUT_LINES "${OUTPUT_LINES}")
+        foreach(_regex ${OCV_COMPILER_FAIL_REGEX})
+          if(NOT ${RESULT})
+            break()
+          endif()
+          foreach(_line ${OUTPUT_LINES})
+            if("${_line}" MATCHES "${_regex}")
+              file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+                  "Build output check failed:\n"
+                  "    Regex: '${_regex}'\n"
+                  "    Output line: '${_line}'\n")
+              set(${RESULT} 0)
               break()
-        ENDIF()
-      ENDFOREACH()
+            endif()
+          endforeach()
+        endforeach()
+      endif()
 
       IF(${RESULT})
         SET(${RESULT} 1 CACHE INTERNAL "Test ${RESULT}")
@@ -251,6 +264,13 @@ MACRO(ocv_check_compiler_flag LANG FLAG RESULT)
       ELSE(${RESULT})
         MESSAGE(STATUS "Performing Test ${RESULT} - Failed")
         SET(${RESULT} "" CACHE INTERNAL "Test ${RESULT}")
+        file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+            "Compilation failed:\n"
+            "    source file: '${_fname}'\n"
+            "    check option: '${FLAG}'\n"
+            "===== BUILD LOG =====\n"
+            "${OUTPUT}\n"
+            "===== END =====\n\n")
       ENDIF(${RESULT})
     else()
       SET(${RESULT} 0)