[CMake] Compiling zlib and libpng with one command

[Michael Jackson]

Well,
  Having gone down this path just this morning with BOTH of those  
libraries, here is what I did.

In my png/CMakeList.txt file, I have the following:

include_directories(${CxImage_SOURCE_DIR}/Utilities/cxzlib)
include_directories(${CxImage_BINARY_DIR}/CxZLib)
....
ADD_LIBRARY(CxPng ${LIB_TYPE} ${PNG_SRCS} ${PNG_HDRS})
TARGET_LINK_LIBRARIES(CxPng CxZLib)

In my Top level CMakeLists.txt file I have the following:

add_subdirectory(${CxImage_SOURCE_DIR}/Utilities/cxzlib $ 
{CxImage_BINARY_DIR}/CxZLib)
add_subdirectory(${CxImage_SOURCE_DIR}/Utilities/cxpng $ 
{CxImage_BINARY_DIR}/CxPng)

That sets up the dependencies between Png and ZLib. CMake generated  
build files should now know to build Zlib first, then Png. You can  
take a look at the specific project here:

http://www.bluequartz.net/cgi-bin/gitweb/gitweb.cgi?p=CxImage.git;a=summary

I am porting the CxImage project to CMake so I can use it on more than  
just Windows. And just to be fair, I grabbed a lot of the CMake code  
to build ZLib and Png from the VTK and ITK projects.

_________________________________________________________
Mike Jackson                  mike.jackson at bluequartz.net
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio

On Nov 12, 2009, at 6:59 PM, Hugh Sorby wrote:

>
> I am trying to compile zlib and libpng with one command, or more  
> specifically one series of commands.  My aim is to get as simple as  
> possible to the following
>
> cmake
> make
> make install
>
> So what I have done so far is to layout my directories like so:
>
> third_party
> |
> --zlib
> |
> --libpng
>
>
> In each directory I have a CMakeLists.txt file that will build the  
> libraries.  So far so good.  Now with a clean system i.e. one where  
> libpng can't find zlib (because it hasn't been built yet) I try  
> executing:
>
> cmake
>
> Which runs as expected right up until libpng requires the existence  
> of zlib.  So my problem is how to tell libpng that zlib is on it's  
> way if it could only be a little patient.  Preferebly without having  
> to touch the CMakeLists.txt file inside libpng directory
>
> Also is this strategy likely to fly or is it never going to get off  
> the ground?
>
> Chreers.
>
> Also, can CMake apply patches?
>
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