strip - file format not recognized with Qt creator on Release but not Debug

Question

Using qmake on Qt creator

I want to add some parameters and data files to the build directory, so I added this to my pro file

wordlists.path = $$OUT_PWD/WordLists
wordlists.files += $$PWD/WordLists/*

INSTALLS += \
    wordlists

and added a make install step at the end of the build steps.

On debug, this works perfectly and the WordLists folder, which is in the source folder, is copied to the build folder.

On release, it also works. But when compiling, I get 4 warning Makefile:2124:install_wordlists] Error 1 (ignored) , on for each files in the folder to be copied.

The output of the compiler shows

strip: /path/to/my/release/folder/WordLists/List1.xml: file format not recognized
make: [Makefile:2124: install_wordlists] Error 1 (ignored)
strip: /path/to/my/release/folder/WordLists/List2.xml: file format not recognized
make: [Makefile:2126: install_wordlists] Error 1 (ignored)
strip: /path/to/my/release/folder/WordLists/List3.xml: file format not recognized
make: [Makefile:2128: install_wordlists] Error 1 (ignored)
strip: /path/to/my/release/folder/WordLists/Parametres.xml: file format not recognized
make: [Makefile:2130: install_wordlists] Error 1 (ignored)

While these message apparently don't disturb the good behavior of the make, I am still puzzled by their meaning and why it only appends on release. They could also mean that I do thing fundamentally wrong...

Answer 1

Solution found rather quickly...

Due to an error of mine, the files in WordLists where executable. I removed the +x flag and the warning is gone.