Improve error reporting on core archive creation

Author: facchinm

constants/constants.go

@@ -154,6 +154,7 @@ const LOG_LEVEL_INFO = "info"
 const LOG_LEVEL_WARN = "warn"
 const MSG_ARCH_FOLDER_NOT_SUPPORTED = "'arch' folder is no longer supported! See http://goo.gl/gfFJzU for more information"
 const MSG_ARCHIVING_CORE_CACHE = "Archiving built core (caching) in: {0}"
+const MSG_CORE_CACHE_UNAVAILABLE = "Unable to cache built core, please tell {0} maintainers to follow http://goo.gl/QdCUjo"
 const MSG_BOARD_UNKNOWN = "Board {0} (platform {1}, package {2}) is unknown"
 const MSG_BOOTLOADER_FILE_MISSING = "Bootloader file specified but missing: {0}"
 const MSG_BUILD_OPTIONS_CHANGED = "Build options changed, rebuilding all"

phases/core_builder.go

@@ -124,10 +124,14 @@ func compileCore(ctx *types.Context, buildPath string, buildCachePath string, bu
 
 	// archive core.a
 	if targetArchivedCore != "" {
+		err := builder_utils.CopyFile(archiveFile, targetArchivedCore)
 		if ctx.Verbose {
-			logger.Println(constants.LOG_LEVEL_INFO, constants.MSG_ARCHIVING_CORE_CACHE, targetArchivedCore)
+			if err == nil {
+				logger.Println(constants.LOG_LEVEL_INFO, constants.MSG_ARCHIVING_CORE_CACHE, targetArchivedCore)
+			} else {
+				logger.Println(constants.LOG_LEVEL_INFO, constants.MSG_CORE_CACHE_UNAVAILABLE, ctx.ActualPlatform.PlatformId)
+			}
 		}
-		builder_utils.CopyFile(archiveFile, targetArchivedCore)
 	}
 
 	return archiveFile, variantObjectFiles, nil