[CMake] add_custom and files generated into subdirectories

[Micha Renner]

I guess, this is one of the rare cases where one need:

SET_SOURCE_FILES_PROPERTIES(Foo.cpp PROPERTIES GENERATED TRUE)

Greetings

Micha


Am Mittwoch, den 11.04.2012, 11:18 -0500 schrieb William R. Otte:
> Hi - 
> 
> I have a question about resolving dependencies when add_custom is used to generate files into subdirectories.  Consider the following example (substantially simplified from my use case, but it captures the essence of what I am trying to do:
> 
> In the root of the project, I have the following:
> 
> /Foo.cmake:
> add_custom_command (OUTPUT Bar/Foo.cpp
>                     COMMAND touch Bar/Foo.cpp
>                    )
> 
> #end /Foo.cmake
> 
> /CMakeLists.txt:
> cmake_minimum_required(VERSION 2.8)
> 
> include (Foo.cmake)
> add_subdirectory (Bar)
> 
> #end /CMakeLists.txt
> 
> In a subdirectory Bar, I have the following:
> 
> /Bar/Bar.cmake:
> add_library ( Bar SHARED
>               Foo.cpp )
> #end /Bar/Bar.cmake
> 
> /Bar/CMakeLists.txt:
> include (Bar.cmake)
> #end /Bar/CMakeLists.txt
> 
> 
> When I attempt to compile this into makefiles, I get the following diagnostic from cmake:
> 
> CMake Error at Bar/Bar.cmake:1 (add_library):
>   Cannot find source file:
> 
>     Foo.cpp
> 
>   Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
>   .hxx .in .txx
> Call Stack (most recent call first):
>   Bar/CMakeLists.txt:1 (include)
> 
> 
> I understand why that diagnostic is appearing (cmake knows about a Bar/Foo.cpp, but not about a Foo.cpp).  Is there some way to get Cmake to automagically realize that within the context of Bar.cmake, Foo.cpp and Bar/Foo.cpp are the same thing?
> 
> thanks,
> /-Will
> 
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