[CMake] single static library from many subdirectories

[Robert Maynard]

Instead of having a per directory CMakeLists.txt you can do something
like the following.

add_library(eema STATIC sub-dir-a/file1.cpp  sub-dir-b/file2.cpp)

On Tue, Apr 11, 2017 at 11:43 AM, Reuben Kraft <reuben.kraft at gmail.com> wrote:
> Hello,
>
> I was reading this page about how to make a single library from many
> subdirectories using object files:
> https://cmake.org/Wiki/CMake/Tutorials/Object_Library
>
> It is exactly what I want to do but my problem is that I do not have any
> source files in my "top directory" they are all in the subdirectories. I
> have something like this:
>
> top-dir
> --CMakeLists.txt
> ------sub-dir-a
> --------------CMakeLists.txt
> --------------file1.cpp
> ------sub-dir-b
> --------------CMakeLists.txt
> --------------file2.cpp
>
> However, I get the follow error message when I run cmake:
>
> You have called ADD_LIBRARY for library eema without any source files. This
> typically indicates a problem with your CMakeLists.txt file.
>
> Is there a way to do this without haveing any source files in the top
> directory?
>
> Thanks,
>
> Reuben
>
>
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