Add a mutex to avoid map concurrent access

Author: facchinm

builder_utils/utils.go

@@ -207,6 +207,8 @@ func compileFilesWithRecipe(ctx *types.Context, objectFiles []string, sourcePath
 	}
 }
 
+var warningCacheMutex sync.Mutex
+
 func compileFileWithRecipe(ctx *types.Context, sourcePath string, source string, buildPath string, buildProperties properties.Map, includes []string, recipe string) (string, error) {
 	logger := ctx.GetLogger()
 	properties := buildProperties.Clone()
@@ -234,7 +236,9 @@ func compileFileWithRecipe(ctx *types.Context, sourcePath string, source string,
 		if err != nil {
 			return "", i18n.WrapError(err)
 		}
+		warningCacheMutex.Lock()
 		ctx.WarningsCache[source] = string(stderrCache)
+		warningCacheMutex.Unlock()
 	} else {
 		if ctx.Verbose {
 			logger.Println(constants.LOG_LEVEL_INFO, constants.MSG_USING_PREVIOUS_COMPILED_FILE, properties[constants.BUILD_PROPERTIES_OBJECT_FILE])