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Cygwin make target is never determined up to date


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.
-- 
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