Hi, thanks for the response. I was eager to solve this. I came up with this solution: -I$<JOIN:$<TARGET_PROPERTY:dummy,INCLUDE_DIRECTORIES>,\t-I> I searched for a solution where i can use it without the quotes while the tab (\t) takes care that it is recognized as a generator expression. Now my command line looks a little bit odd with all these tabs but it works. I choosed the \t because i need spaces between the arguments and there is no escape sequence for spaces. So i simply wonder whether it is possible to add to cmake something like \s for a space. Jerry On 31.05.2016 16:22, Brad King wrote: > On 05/28/2016 01:15 PM, jerry....@web.de wrote: >> "-I$<JOIN:$<TARGET_PROPERTY:dummy,INCLUDE_DIRECTORIES>, -I>" > > This tells CMake to generate a single argument consisting of the > entire expanded value. We have no syntax to expand lists into > multiple command line arguments after evaluation of generator > expressions. Without the quotes the "$<" and ">" parts appear > in different arguments to add_custom_command and so it is not > recognized as a generator expression. > > It is not currently possible to do what you are trying to do. > You'll need to use file(GENERATE) to produce a script holding > the desired command instead. Then launch the script as the > custom target's command. > > -Brad > --
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