2 files changed, 6 insertions, 3 deletions
diff --git a/xmake/core/base/log.lua b/xmake/core/base/log.lua
index 186a4ce30..e9b05f8c1 100644
--- a/xmake/core/base/log.lua
+++ b/xmake/core/base/log.lua
@@ -48,7 +48,7 @@ function log.file()
             end
 
             -- open the log file
-            log._FILE = io.open(outputfile, 'w')
+            log._FILE = io.open(outputfile, 'w+')
         end
         log._FILE = log._FILE or false
     end
diff --git a/xmake/core/base/utils.lua b/xmake/core/base/utils.lua
index 49b05ea0a..e28938648 100644
--- a/xmake/core/base/utils.lua
+++ b/xmake/core/base/utils.lua
@@ -147,9 +147,8 @@ function utils.verror(format, ...)
 
     -- enable verbose?
     if option.get("verbose") and format ~= nil then
-        
-        -- trace
         utils.cprint("${bright red}error: ${clear}" .. string.tryformat(format, ...))
+        log.flush()
     end
 end
 
@@ -159,6 +158,7 @@ function utils.error(format, ...)
     -- trace
     if format ~= nil then
         utils.cprint("${bright red}error: ${clear}" .. string.tryformat(format, ...))
+        log.flush()
     end
 end
 
@@ -180,6 +180,9 @@ function utils.warning(format, ...)
         utils.cprint(msg)
         warnings[msg] = true
     end
+
+    -- flush
+    log.flush()
 end
 
 -- ifelse, a? b : c