[CMake] Problems with EnternalProjectAdd

Michael Ellery mellery451 at gmail.com
Tue Feb 19 12:11:56 EST 2019 

Here’s a complete example that works on my system - maybe you can tweak it to your liking:


cmake_minimum_required (VERSION 3.9.0)
include (ExternalProject)
project (simple_ep)
set(BUILD_ENV "${CMAKE_BINARY_DIR}/build_env" CACHE STRING INTERNAL)
ExternalProject_Add(
  freetype
  PREFIX "${BUILD_ENV}/freetype"
  GIT_REPOSITORY "https://github.com/brooklynpacket/freetype2.git"
  GIT_TAG 64bit
  BUILD_IN_SOURCE true
  CONFIGURE_COMMAND
    ./autogen.sh
    COMMAND
    ./configure
  BUILD_COMMAND
    make
  TEST_COMMAND ""
  INSTALL_COMMAND ""
  LOG_DOWNLOAD ON
  LOG_INSTALL ON
  LOG_CONFIGURE ON
  LOG_BUILD ON
  LOG_TEST ON
  LOG_INSTALL ON
)

add_library (ft_lib STATIC IMPORTED GLOBAL)
ExternalProject_Get_Property (freetype SOURCE_DIR)
set_target_properties (ft_lib PROPERTIES
  IMPORTED_LOCATION
    ${SOURCE_DIR}/objs/.libs/libfreetype.a)
add_dependencies (ft_lib freetype)
add_executable (app main.cpp)
target_link_libraries(app ft_lib)


-Mike

> On Feb 18, 2019, at 10:25 PM, Workbench at gmx.at <workbench at gmx.at> wrote:
> 
> Can't i somehow output the pwd ??
> 
> best regards!
> 
> On 19.02.19 07:04, Workbench at gmx.at wrote:
>> Now i'm getting:
>> 
>>  Command failed: No such file or directory
>> 
>>    'cd /home/stuv/data/projects/programming/bsUltimate/build/build_env/freetype/src/freetype && ./autogen.sh && ./configure && make'
>> 
>> but when i go to my bsUltimate path and type that command it works...
>> 
>> 
>> 
>> best regards!
>> 
>> On 19.02.19 06:57, Romain LEGUAY wrote:
>>> Hi,
>>> 
>>> I think you need to set the variable CONFIGURE_COMMAND to empty like this:
>>> 
>>>> ExternalProject_Add(
>>>>         freetype
>>>>         PREFIX "${BUILD_ENV}/freetype"
>>>>         GIT_REPOSITORY "https://github.com/brooklynpacket/freetype2.git"
>>>>         GIT_TAG 64bit
>>>          CONFIGURE_COMMAND ""
>>>>         BUILD_COMMAND "cd ${CMAKE_BUILD_DIR}/freetype/src/freetype && ./autgen.sh && ./configure && make"
>>>>         LOG_DOWNLOAD ON
>>>>         LOG_INSTALL ON
>>>>         LOG_CONFIGURE ON
>>>>         LOG_BUILD ON
>>>>         LOG_TEST ON
>>>>         LOG_INSTALL ON
>>>>         )
>>> 
>>> Envoyé de mon iPad
>>> 
>>> Le 19 févr. 2019 à 06:51, Workbench at gmx.at <workbench at gmx.at> a écrit :
>>> 
>>>> I played around a bit a now have the following:
>>>> 
>>>> set(BUILD_ENV "${CMAKE_BINARY_DIR}/build_env" CACHE STRING INTERNAL)
>>>> set(LIBRARY_DIR "${CMAKE_BINARY_DIR}/lib" CACHE STRING INTERNAL)
>>>> 
>>>>     ExternalProject_Add(
>>>>         freetype
>>>>         PREFIX "${BUILD_ENV}/freetype"
>>>>         GIT_REPOSITORY "https://github.com/brooklynpacket/freetype2.git"
>>>>         GIT_TAG 64bit
>>>>         BUILD_COMMAND "cd ${CMAKE_BUILD_DIR}/freetype/src/freetype && ./autgen.sh && ./configure && make"
>>>>         LOG_DOWNLOAD ON
>>>>         LOG_INSTALL ON
>>>>         LOG_CONFIGURE ON
>>>>         LOG_BUILD ON
>>>>         LOG_TEST ON
>>>>         LOG_INSTALL ON
>>>>         )
>>>> 
>>>> The logs are telling me: CMake Error: The source directory "/home/stuv/data/projects/programming/bsUltimate/build/build_env/freetype/src/freetype" does not appear to contain CMakeLists.txt.
>>>> 
>>>> Isn't the BUILD_COMMAND there if there is no CMakeLists.txt file available for building ? not many project provide cmake build files....
>>>> 
>>>> 
>>>> best regards!
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On 19.02.19 06:43, Michael Ellery wrote:
>>>>> CMAKE_BUILD_DIR is not a standard variable (did you mean CMAKE_BINARY_DIR ?) - and the error seems to indicate that the variable is indeed empty so it tries to create the project directory at the root level.
>>>>> 
>>>>> -Mike
>>>>> 
>>>>>> On Feb 18, 2019, at 8:58 PM, Workbench at gmx.at <workbench at gmx.at> wrote:
>>>>>> 
>>>>>> Hi again,
>>>>>> 
>>>>>> i try to install my dependencies with ExternalProjectAdd but it gives me troubles... what's wrong with
>>>>>> 
>>>>>> 
>>>>>>     ExternalProject_Add(
>>>>>>         freetype
>>>>>>         PREFIX "${CMAKE_BUILD_DIR}/freetype"
>>>>>>         GIT_REPOSITORY "https://github.com/brooklynpacket/freetype2.git"
>>>>>>         GIT_TAG 64bit
>>>>>>         BUILD_COMMAND "cd ${CMAKE_BUILD_DIR}/freetype/src/freetype && ./autgen.sh && ./configure && make"
>>>>>>         LOG_DOWNLOAD ON
>>>>>>         LOG_INSTALL ON
>>>>>>         LOG_CONFIGURE ON
>>>>>>         LOG_BUILD ON
>>>>>>         LOG_TEST ON
>>>>>>         LOG_INSTALL ON
>>>>>>         )
>>>>>> 
>>>>>> best regards!
>>>>>> 
>>>>>> -- 
>>>>>> 
>>>>>> Powered by www.kitware.com
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>>>> 
>>>> Powered by www.kitware.com
>>>> 
>>>> Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ
>>>> 
>>>> Kitware offers various services to support the CMake community. For more information on each offering, please visit:
>>>> 
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>>>> 
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>>>> 
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>> 
> 
> -- 
> 
> Powered by www.kitware.com
> 
> Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ
> 
> Kitware offers various services to support the CMake community. For more information on each offering, please visit:
> 
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
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> 
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> 
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