From a34b85490d26a9064f892e43b8c6fa8005a7c770 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@kolpackov.net>
Date: Wed, 7 Dec 2005 11:33:38 +0000
Subject: [PATCH] Fixed bug #14334 by propagate the change of modification time
 to all the double-colon entries only if it is the last one to be updated.

---
 ChangeLog                           |  6 ++++++
 remake.c                            | 32 +++++++++++++++++++++++++++-----
 tests/ChangeLog                     |  4 ++++
 tests/scripts/features/double_colon | 28 ++++++++++++++++++++++++++++
 4 files changed, 65 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 2a01c8c..5d30cff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2005-12-07  Boris Kolpackov  <boris@kolpackov.net>
+
+	* remake.c (notice_finished_file): Propagate the change of
+	modification time to all the double-colon entries only if
+	it is the last one to be updated. Fixes bug #14334.
+
 2005-11-17  Boris Kolpackov  <boris@kolpackov.net>
 
 	* function.c (func_flavor): Implement the flavor function which
diff --git a/remake.c b/remake.c
index 750a80c..0795af3 100644
--- a/remake.c
+++ b/remake.c
@@ -841,7 +841,6 @@ notice_finished_file (struct file *file)
 
   if ((ran && !file->phony) || touched)
     {
-      struct file *f;
       int i = 0;
 
       /* If -n, -t, or -q and all the commands are recursive, we ran them so
@@ -861,11 +860,34 @@ notice_finished_file (struct file *file)
 	i = 1;
 
       file->last_mtime = i == 0 ? UNKNOWN_MTIME : NEW_MTIME;
+    }
 
-      /* Propagate the change of modification time to all the double-colon
-	 entries for this file.  */
-      for (f = file->double_colon; f != 0; f = f->prev)
-	f->last_mtime = file->last_mtime;
+  if (file->double_colon)
+    {
+      /* If this is a double colon rule and it is the last one to be
+         updated, propagate the change of modification time to all the
+         double-colon entries for this file.
+
+         We do it on the last update because it is important to handle
+         individual entries as separate rules with separate timestamps
+         while they are treated as targets and then as one rule with the
+         unified timestamp when they are considered as a prerequisite
+         of some target.  */
+
+      struct file *f;
+      FILE_TIMESTAMP max_mtime = file->last_mtime;
+
+      /* Check that all rules were updated and at the same time find
+         the max timestamp.  We assume UNKNOWN_MTIME is newer then
+         any other value.  */
+      for (f = file->double_colon; f != 0 && f->updated; f = f->prev)
+        if (max_mtime != UNKNOWN_MTIME
+            && (f->last_mtime == UNKNOWN_MTIME || f->last_mtime > max_mtime))
+          max_mtime = f->last_mtime;
+
+      if (f == 0)
+        for (f = file->double_colon; f != 0; f = f->prev)
+          f->last_mtime = max_mtime;
     }
 
   if (ran && file->update_status != -1)
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 01aecc6..93cac87 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2005-12-07  Boris Kolpackov  <boris@kolpackov.net>
+
+	* scripts/features/double_colon: Add a test for bug #14334.
+
 2005-11-17  Boris Kolpackov  <boris@kolpackov.net>
 
 	* scripts/functions/flavor: Add a test for the flavor function.
diff --git a/tests/scripts/features/double_colon b/tests/scripts/features/double_colon
index 082b815..cad605d 100644
--- a/tests/scripts/features/double_colon
+++ b/tests/scripts/features/double_colon
@@ -124,4 +124,32 @@ $answer = "ok\n$make_name: Circular d <- d dependency dropped.\noops\n";
 
 unlink('foo','f1.h','f2.h');
 
+
+# TEST 9: make sure all rules in s double colon family get executed
+#         (Savannah bug #14334).
+#
+
+&touch('one');
+&touch('two');
+
+run_make_test('
+.PHONY: all
+all: result
+
+result:: one
+	@echo $^ >>$@
+	@echo $^
+
+result:: two
+	@echo $^ >>$@
+	@echo $^
+
+',
+'',
+'one
+two');
+
+unlink('result','one','two');
+
+# This tells the test driver that the perl test script executed properly.
 1;
-- 
2.7.4