[CMake] how to force assign sequence in multi-thread in cmake

[Petr Kmoch]

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(cmake_sample CRFPP_EX_PROJ)
>
> but it seems not works ?
>
> Thanks for any help.
>
>
>
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