I am in OSX 10.9.4 , a sample in github is : https://github.com/yujing5b5d/cmake_sample
after git clone this project , a operation like this :
------------------------------------------------------------------------------------------------------------
yu:cmake_sample yu$ mkdir build
yu:cmake_sample yu$ cd build/
yu:build yu$ cmake ..
…. # skip some useless output
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/yu/Workspace/res/cmake_sample/build
yu:build yu$ make -j8 ### <<<<<<<<<<<<<<<
Scanning dependencies of target LEVELDB_EX_PROJ
Scanning dependencies of target iniparser
Scanning dependencies of target relfiles
Scanning dependencies of target CRFPP_EX_PROJ
Scanning dependencies of target iniparser_static
[ 15%] [ 15%] [ 20%] [ 20%] [ 25%] Building C object lib/iniparser/CMakeFiles/iniparser_static.dir/ini.c.o
Creating directories for 'CRFPP_EX_PROJ'
Creating directories for 'LEVELDB_EX_PROJ'
Building C object lib/iniparser/CMakeFiles/iniparser.dir/ini.c.o
Building CXX object src/CMakeFiles/relfiles.dir/main.cc.o
[ 30%] [ 35%] Performing download step (git clone) for 'LEVELDB_EX_PROJ'
Performing download step (git clone) for 'CRFPP_EX_PROJ'
/Users/yu/Workspace/res/cmake_sample/src/main.cc:3:10: fatal error: 'crfpp.h' file not found
#include "crfpp.h" // crfpp
^
Cloning into 'CRFPP_EX_PROJ'...
Cloning into 'LEVELDB_EX_PROJ'...
Linking C static library ../libiniparser.a
Linking C shared library ../libiniparser.dylib
[ 35%] [ 35%] Built target iniparser_static
Built target iniparser
Scanning dependencies of target cmake_sample
[ 40%] Building CXX object src/CMakeFiles/cmake_sample.dir/main.cc.o
/Users/yu/Workspace/res/cmake_sample/src/main.cc:3:10: fatal error: 'crfpp.h' file not found
#include "crfpp.h" // crfpp
^
1 error generated.
1 error generated.
make[2]: *** [src/CMakeFiles/relfiles.dir/main.cc.o] Error 1
make[2]: *** [src/CMakeFiles/cmake_sample.dir/main.cc.o] Error 1
make[1]: *** [src/CMakeFiles/relfiles.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
make[1]: *** [src/CMakeFiles/cmake_sample.dir/all] Error 2
….
------------------------------------------------------------------------------------------------------------
BE CAREFUL OF THIS LINE :
>> yu:build yu$ make -j8
the ExternalProject CRFPP_EX_PROJ’s result contains copy a crfpp.h header to a special path, after this process , we can use #include “crfpp.h" ,and If I use
make -j8
this means 8 jobs can be running at the same time, I can not constraints and let my compiler compile my main.cc after CRFPP_EX_PROJ finished.
Of course , I’m not sure is this my misuse this project .
On Sep 16, 2014, at 14:55, Micha Hergarden <micha.hergarden at gmail.com> wrote:
> Hello all,
>
> I do use the ExternalProject to prebuild some binaries, without the 'superproject' setup, and it does seem to work. Using the add_dependencies, I can make sure some third party libs are prebuild before I start to build my project. I have seen some issues with ExternalProject (failing to extract, or build), but they are too rare to pinpoint and create a bugreport.
>
> What exactly does not work? Is the external project not build at all, or just not in time?
>
> Regards,
> Micha
>
> On 09/16/2014 08:30 AM, Petr Kmoch wrote:
>> Hi.
>>
>> I've never worked with ExternalProject myself, so I can't comment with certainty, but from what I understand, the correct way of using ExternalProject is to add your own project as an ExternalProject as well. Basically, the toplevel CMakeList becomes a superbuild which *only* does ExternalProject_Add() calls and does not add any libraries/executables directly. After you build the superbuild once to get all the dependencies correct, you switch to the "external" project of your own code and work with that normally.
>>
>> Petr
>>
>> On Mon, Sep 15, 2014 at 4:13 PM, Yu Jing <yujing5b5d at gmail.com> wrote:
>> I had asked in http://stackoverflow.com/questions/25841602 , someone told me maybe here is a better place to ask.
>>
>> I am writing a project base on crfpp , a external project. I use cmake to integerate this project as follow .
>>
>> firstly , I add a extenal project like this:
>>
>> EXTERNALPROJECT_ADD(
>> CRFPP_EX_PROJ
>> GIT_REPOSITORY git at github.com:yujing5b5d/crfpp.git
>> PREFIX ${CMAKE_CURRENT_BINARY_DIR}
>> CONFIGURE_COMMAND ./configure
>> BUILD_COMMAND make -j8
>> BUILD_IN_SOURCE 1
>> INSTALL_COMMAND cp .libs/libcrfpp.a ${PROJECT_BINARY_DIR}/lib && cp crfpp.h ${PROJECT_BINARY_DIR}/include
>> )
>> this will generate some .a file and copy a header file crfpp.h to folder ${PROJECT_BINARY_DIR}/include , which is included in my project.
>>
>> and then , use the ${PROJECT_BINARY_DIR}/include as include path as follow .
>>
>> INCLUDE_DIRECTORIES(
>> ${PROJECT_SOURCE_DIR}/include
>> ${PROJECT_BINARY_DIR}/include
>> )
>> finally , when I compile the main project , code like this :
>>
>> ADD_EXECUTABLE(cmake_sample main.cc)
>> ADD_DEPENDENCIES(cmake_sample CRFPP_EX_PROJ)
>> TARGET_LINK_LIBRARIES(cmake_sample crfpp)
>> In general , if I just build a build folder, compile like this :
>>
>> cmake ..
>> make
>> It may works fine, compile the external project first , and copy the header file to desired place , and then continue compile main.cc in my project . But if I use compile command as multi-thread like this :
>>
>> cmake ..
>> make -j8
>> It will not works because my main.cc and the external project are processed at same time, so it report a error like this :
>>
>> /Users/yu/Workspace/res/cmake_sample/src/main.cc:3:10: fatal error: 'crfpp.h' file not found
>> #include "crfpp.h" // crfpp
>> ^
>> 1 error generated.
>> This crfpp.h will generated after CRFPP_EX_PROJ , but in multi-thread environment , the sequence is quite different .
>>
>> My Question is : Is it possible that force let my project compile after these external projects all finished . BE CAREFUL , I'm not sure is this the problem of my use of ADD_DEPENDENCIES , I also wrote
>>
>> ADD_DEPENDENCIES(<
>> span style="margin:0px;padding:0px;border:0px;vertical-align:baseline;background-color:transparent;background-repeat:initial initial">cmake_sample CRFPP_EX_PROJ)
>> but it seems not works ?
>>
>> Thanks for any help.
>>
>>
>>
>> --
>>
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>
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