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Date:	Tue, 4 May 2010 21:49:08 -0700 (PDT)
From:	MichaelKim <souren AT gmail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Cygwin make target is never determined up to date
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Yea I tried to add sleep, no good. Consequent calls doesn't go
$(jar_target_dir) target, they only run $(chrome_jar_file) target.

It's NTFS, Windows 7. The other system which performs as expected Windows
XP, again NTFS.
Here is some additional information:

    Reading makefiles...
    Updating goal targets....
     File `all' does not exist.
         Prerequisite `../bin/build/chrome' is newer than
                 target `../bin/build/chrome/alt.jar'.
        Must remake target `../bin/build/chrome/alt.jar'.
    Creating chrome JAR file.
    updating: content/about.js (deflated 66%)
    updating: content/sprintf.js (deflated 52%)
    ...

and stats

    $ stat ../bin/build/chrome/alt.jar ../bin/build/chrome
      File: `../bin/build/chrome/alt.jar'
      Size: 29220           Blocks: 32         IO Block: 65536  regular file
    Device: 22c6affh/36465407d      Inode: 59672695062724268  Links: 1
    Access: (0644/-rw-r--r--)  Uid: ( 1000/    xxx)   Gid: (  513/    None)
    Access: 2010-05-05 13:03:01.066457300 +0900
    Modify: 2010-05-05 13:03:01.088960100 +0900
    Change: 2010-05-05 13:03:01.091460400 +0900
      File: `../bin/build/chrome'
      Size: 0               Blocks: 0          IO Block: 65536  directory
    Device: 22c6affh/36465407d      Inode: 3940649674014457  Links: 1
    Access: (0755/drwxr-xr-x)  Uid: ( 1000/    xxx)   Gid: (  513/    None)
    Access: 2010-05-05 13:03:01.090960400 +0900
    Modify: 2010-05-05 13:03:01.090960400 +0900
    Change: 2010-05-05 13:03:01.090960400 +0900

as you can see `chrome` dir is really newer than `alt.jar`


Jeremy Bopp-3 wrote:
> 
> MichaelKim wrote:
>> Cygwin make always processing `$(chrome_jar_file)` target, after first
>> successful build. So I never get up to date message and always see
>> commands
>> for `$(chrome_jar_file)` are executing.
>> 
>> However it happens only on Windows 7. On Windows XP once it built and
>> intact, no more builds.
>> I narrowed down the issue to one prerequisite - `$(jar_target_dir)`.
>> 
>> Here is part of the code
>> 
>>     # The location where the JAR file will be created.
>>     jar_target_dir := $(build_dir)/chrome
>>     
>>     # The main chrome JAR file.
>>     chrome_jar_file := $(jar_target_dir)/$(extension_name).jar
>>     
>>     # The root of the JAR sources.
>>     jar_source_root := chrome
>>     
>>     # The sources for the JAR file.
>>     jar_sources := bla #... some files, doesn't matter
>>     
>>     jar_sources_no_dir := $(subst $(jar_source_root)/,,$(jar_sources))
>>     
>>     $(chrome_jar_file): $(jar_sources) $(jar_target_dir)
>>      @echo "Creating chrome JAR file."
>>      @cd $(jar_source_root); $(ZIP) ../$(chrome_jar_file)
>> $(jar_sources_no_dir)
>>      @echo "Creating chrome JAR file. Done!"
>>     
>>     $(jar_target_dir): $(build_dir)
>>      echo "Creating jar target dir..."
>>      if [ ! -x $(jar_target_dir) ]; \
>>       then \
>>         mkdir $(jar_target_dir); \
>>       fi
>> 
>>     $(build_dir):
>>      @if [ ! -x $(build_dir) ]; \
>>       then \
>>         mkdir $(build_dir); \
>>       fi
>> 
>> 
>> so if I just remove  `$(jar_target_dir)` from `$(chrome_jar_file)` rule,
>> it
>> works fine.
>> Also tried to use `-e` in `if`.
>> So again, question is why in windows 7 target is never up to date and it
>> has
>> always to process it.
> 
> Have you tried adding a short sleep after creating $(jar_target_dir)?
> Maybe try something in the range of 2 to 5 seconds.  BTW, are you
> building on a FAT filesystem or NTFS?
> 
> My guess here is that the timestamps on $(jar_target_dir) and
> $(chrome_jar_file) are the same, at least as far as make is concerned.
> The FAT filesystem, with its 2 second resolution, is somewhat prone to
> this kind of problem.
> 
> -Jeremy
> 
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