qmake INSTALLS copy on change only
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During build I use INSTALLS directive to copy some files to my install directory. However, it looks like the files are copied everytime the build is launched. I would like it to check whether file changed (by comparing timestamp of the file) and only then to copy it.
I have many files to copy during INSTALL and this way it takes a lot of time to copy them even if it is unnecessary.
I also need to copy whole directory ywith all subdirectories, not only single files.
My compiler is MSVC2013 now but cross platform solution would be better of course.