[CMake] ExternalProject_Add() setting build command to run external project's makefile

[Michael Ellery]

It seems like the error might be related to the download/extract step. I think the fact that you are using the same dir for PREFIX, SOURCE_DIR and DOWNLOAD_DIR might be confusing things. I would try commenting out those three properties and see if it makes any difference, and then you can fine-tune those properties as needed once you get it working (maybe but just setting PREFIX).

-Mike

> On May 31, 2019, at 7:41 AM, David Starkweather <starkd88 at gmail.com> wrote:
> 
> Hello
> First off, much thanks to all the contributors of cmake. A truly invaluable build utility. Your efforts
> are greatly appreciated.
> 
> I've been successfully using cmake to build an external project (the client library for redis, hiredis) 
> that has already been downloaded. I was able to do this with BUILD_IN_SOURCE set to true, like so:
> 
> ExternalProject_Add(hiredis  
> PREFIX ${CMAKE_CURRENT_SOURCE_DIR}/hiredis
> SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/hiredis
> BUILD_IN_SOURCE 1
> CONFIGURE_COMMAND echo configure
> BUILD_COMMAND make static
> INSTALL_COMMAND echo install)
> 
> 
> However, now i'd like to automatically download the source from github.  So, I switch to 
> the following:
> 
> set(HIREDIS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/hiredis)
> set(HIREDIS_INCLUDE_DIRS ${HIREDIS_DIR}/include)
> ExternalProject_Add(hiredis
>   URL https://github.com/redis/hiredis/archive/v0.9.0.tar.gz
>   PREFIX ${CMAKE_CURRENT_BINARY_DIR}/hiredis
>   SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/hiredis
>   DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/hiredis
>   BUILD_IN_SOURCE 1
>   CONFIGURE_COMMAND ""
>   BUILD_COMMAND make static
>   INSTALL_COMMAND "")
> 
> And I get the following error:
> 
> [  3%] Creating directories for 'hiredis'
> [  6%] Performing download step (download, verify and extract) for 'hiredis'
> -- Downloading...
>    dst='/home/david/projects/clipseekr/hiredis/v0.9.0.tar.gz'
>    timeout='none'
> -- Using src='https://github.com/redis/hiredis/archive/v0.9.0.tar.gz'
> -- Downloading... done
> -- extracting...
>      src='/home/david/projects/clipseekr/hiredis/v0.9.0.tar.gz'
>      dst='/home/david/projects/clipseekr/hiredis'
> -- extracting... [tar xfz]
> -- extracting... [analysis]
> -- extracting... [rename]
> -- extracting... [clean up]
> -- extracting... done
> make[2]: *** [CMakeFiles/hiredis.dir/build.make:93: hiredis/src/hiredis-stamp/hiredis-download] Error 1
> make[1]: *** [CMakeFiles/Makefile2:147: CMakeFiles/hiredis.dir/all] Error 2
> make: *** [Makefile:163: all] Error 2
> 
> It seems cmake is trying to invoke its internal cmake make files, rather than just run the "make static"
> build command.  How do I just run the the "make static" command directly? 
> 
> Once again, thanks.
> starkdg
>  
>   
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