improve gcc preprocessor

1 files changed, 12 insertions, 6 deletions

diff --git a/xmake/modules/core/tools/gcc.lua b/xmake/modules/core/tools/gcc.lua
index f154fb1ee..9651eab36 100644
--- a/xmake/modules/core/tools/gcc.lua
+++ b/xmake/modules/core/tools/gcc.lua
@@ -400,6 +400,12 @@ function _preprocess(program, argv, opt)
         end
     end
 
+    -- enable "-fdirectives-only"?
+    local fdirectives_only = _g.fdirectives_only
+    if fdirectives_only ~= false and is_gcc then
+        fdirectives_only = true
+    end
+
     -- get flags and source file
     local flags = {}
     local cppflags = {}
@@ -417,6 +423,12 @@ function _preprocess(program, argv, opt)
             return
         end
 
+        -- we cannot enable "-fdirectives-only"
+        if fdirectives_only and (flag:startswith("-D__TIME__=") or
+                flag:startswith("-D__DATE__=") or flag:startswith("-D__TIMESTAMP__=")) then
+            fdirectives_only = false
+        end
+
         -- get compiler flags
         if flag == "-MMD" or (flag:startswith("-I") and #flag > 2) or flag:startswith("--sysroot=") then
             skipped = 1
@@ -442,12 +454,6 @@ function _preprocess(program, argv, opt)
         return
     end
 
-    -- enable "-fdirectives-only"?
-    local fdirectives_only = _g.fdirectives_only
-    if fdirectives_only ~= false and is_gcc then
-        fdirectives_only = true
-    end
-
     -- disable linemarkers?
     local linemarkers = _g.linemarkers
     if linemarkers == nil then