[CMake] How to avoid continuous download while using ExternalProjects

[Luigi Calori]

Hi Michael:

They are more or less something like:


ExternalProject_Add(
    ${PACKAGE}
    SOURCE_DIR ${BASE_SOURCE}/${PACKAGE}/src
    BINARY_DIR ${BASE_BUILD}/${PACKAGE}/build
    INSTALL_DIR ${CMAKE_INSTALL_PREFIX}
    URL http://www.zlib.net/zlib-1.2.3.tar.gz
    PATCH_COMMAND ${CMAKE_COMMAND} -E copy 
"${Package_Dir}/Patch/CMakeLists.txt" <SOURCE_DIR>/CMakeLists.txt
    CMAKE_COMMAND ${CMAKE_COMMAND}
    CMAKE_ARGS
        ${Package_std_cmake_args}
)


The problem is that I do not know how to easily issue a re-build without 
a re-download:
The steps are always done, even if there is something broken in the 
configure or build step, so if I just clean the whole project, the 
download happen again, even if the (patched)source dir is already there.

I am working in MSVC9, from the master project, a download is re-issued 
even whn I switch from debug to release (i think because stamp file are 
config dependent)

Thanks in advance.

Luigi


Michael Wild wrote:
> On 10. Feb, 2010, at 14:57 , Luigi Calori wrote:
>
>   
>> I' m trying to develop a project for building several lib dependencies using ExternalProjectAdd
>>
>> Is there a way to avoid re-download of upstream tar.gz while developing config flags?
>>
>> ANY examples of ExternalProjectAdd would REALLY welcome
>>
>> Thanks in advance.
>>
>> Luigi
>>     
>
> That's strange, this doesn't happen in my projects...
>
> Can you show an example of your ExternalProject_Add calls?
>
> Michael
>
>