[Interest] Qt automoc (CMAKE_AUTOMOC) failure with name clashes

[Lisandro Damián Nicanor Pérez Meyer]

On Sunday 14 December 2014 20:58:58 Roger Leigh wrote:
> I brought this up on the cmake list, since I think this is likely an
> issue with the cmake automoc implementation, but also posting here
> since it's primarily an issue when using Qt.
> 
> I have a source directory layout like this:
> ├── gl
> │   ├── Axis2D.h
> │   ├── Grid2D.h
> │   ├── Image2D.h
> │   └── v20
> │       ├── Axis2D.h
> │       ├── Grid2D.h
> │       └── Image2D.h
> ├── GLContainer.h
> ├── glsl
> │   └── v110
> │       ├── GLFlatShader2D.h
> │       ├── GLImageShader2D.h
> │       └── GLLineShader2D.h
> ├── GLUtil.h
> ├── GLView2D.h
> ├── GLWindow.h
> └── TexelProperties.h
> 
> And use this cmake configuration:
> 
>   set(CMAKE_AUTOMOC ON)
>   set(CMAKE_INCLUDE_CURRENT_DIR ON)
>   set(QTWIDGETS_GL_HEADERS
>       gl/Axis2D.h
>       gl/Grid2D.h
>       gl/Image2D.h)
>   set(QTWIDGETS_GL_V20_HEADERS
>       gl/v20/Axis2D.h
>       gl/v20/Grid2D.h
>       gl/v20/Image2D.h)
> 
> As you can see, the names are duplicated in the two subdirectories.
> I plan to have even more dupliated names as I add support for
> multiple gl/glsl versions.
> Unfortunately, cmake automoc generates this:
> 
> /* This file is autogenerated, do not edit*/
> #include "moc_GLContainer.cpp"
> #include "moc_GLView2D.cpp"
> #include "moc_GLWindow.cpp"
> #include "moc_Axis2D.cpp"
> #include "moc_Grid2D.cpp"
> #include "moc_Image2D.cpp"
> #include "moc_Axis2D.cpp"
> #include "moc_Grid2D.cpp"
> #include "moc_Image2D.cpp"
> #include "moc_GLFlatShader2D.cpp"
> #include "moc_GLImageShader2D.cpp"
> #include "moc_GLLineShader2D.cpp"
> 
> Compilation inevitably fails due to it including the generated source
> files twice.  It's discarded the path information and overwritten the
> generated sources where the names clash.
> 
> - I've seen some old posts to this list and in other places which show
>   this has been an issue historically, and the suggestion has been to
>   rename the source/header files.  However, that's not always possible
>   or acceptable.  In this case, it's definitely not.  There's no problem
>   with the sources/headers themselves, which are correct, just with moc.
> - is there any way to get automoc support to add the full pathname to
>   the generated sources e.g. moc_gl_Axis2D.cpp and moc_gl_v20_Axis2D.cpp.
> - any workarounds with cmake known for this issue?

Hi Roger! Did you find a solution?

-- 
Q. How did the programmer die in the shower?
A. He read the shampoo bottle instructions: Lather. Rinse. Repeat.
  http://www.devtopics.com/best-programming-jokes/

Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/
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