Re: [CMake] How to build and link Externa Project with exported target
Say your project is called foo, you could do something like this:
# Mark variables to be included in the cache-init script
# The variables must already exist in the cache.
function(foo_add_cache_init_vars)
get_property(is_defined GLOBAL PROPERTY FOO_CACHE_INIT_VARIABLES DEFINED)
if(NOT is_defined)
define_property(GLOBAL PROPERTY FOO_CACHE_INIT_VARIABLES
BRIEF_DOCS Variables to be written to the cache initialization script
FULL_DOCS The variables will be used to initialize external projects
)
endif()
set_property(GLOBAL APPEND PROPERTY FOO_CACHE_INIT_VARIABLES ${ARGN})
endif()
# Write the cache initializer script
function(foo_write_cache_init_script outfile)
get_property(is_set GLOBAL PROPERTY FOO_CACHE_INIT_VARIABLES SET)
if(NOT is_set)
message(FATAL_ERROR
You must call foo_add_cache_init_var before calling this function)
endif()
get_property(varnames GLOBAL PROPERTY FOO_CACHE_INIT_VARIABLES)
set(text # Automatically generated, do not edit!\n)
foreach(var IN LISTS varnames)
get_property(vartype CACHE ${var} PROPERTY TYPE)
get_property(varhelp CACHE ${var} PROPERTY HELPSTRING)
set(text ${text}set(${var} \${${var}}\ CACHE ${vartype}
\${varhelp}\)\n)
endforeach()
file(WRITE ${outfile} ${text})
endfunction()
# here goes the real stuff
foo_add_cache_init_vars(
CMAKE_C_COMPILER
CMAKE_CXX_COMPILER
CMAKE_OSX_ARCHITECTURES
CMAKE_OSX_DEPLOYMENT_TARGET
CMAKE_OSX_SYSROOT
CMAKE_VERBOSE_MAKEFILE
# ...
)
foreach(config _DEBUG _RELEASE _MINSIZEREL _RELWITHDEBINFO)
foo_add_cache_init_vars(
CMAKE_C_FLAGS${config}
CMAKE_CXX_FLAGS${config}
CMAKE_MODULE_LINKER_FLAGS${config}
CMAKE_SHARED_LINKER_FLAGS${config}
# ...
)
endforeach()
foo_write_cache_init_script(${CMAKE_BINARY_DIR}/ExternalCacheInitScript.cmake)
I haven't tested it, but something along these lines should work.
HTH
Michael
On 19. Mar, 2010, at 15:11 , Nicola Brisotto wrote:
Hi,
the solution with a master CMakeLists.txt works well but now I don't
know how to write wrapper for OPTION and SET functions, can you give
me an example?
I'm quite new to cmake so another question is:
what is the diffence between create a xxx-config and the file I create
with INSTALL(EXPORT QXmppClient DESTINATION include/QXmppClient ) ?
They seem to do the same thing but probably I'm missing something
Nicola Brisotto
On Wed, Mar 17, 2010 at 8:44 PM, Alexander Neundorf
a.neundorf-w...@gmx.net wrote:
On Wednesday 17 March 2010, Michael Wild wrote:
On 17. Mar, 2010, at 15:43 , Luigi Calori wrote:
...
Is this ExternalProject_Add feature really used/developed? I find it
really nice but a little scared of weather it will be really supported
and improved. I have done some patching on it but not know if there is a
group of user/developer eventually interested to submit mods to
It is actively used and developed, but also relatively new. If you have
improvements, it's best to create a tracker item with a patch and
description there and post the link to the item on this list.
Yes. And git support for it would be a really nice thing to have :-)
Alex
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Re: [CMake] How to build and link Externa Project with exported target
Hi, the solution with a master CMakeLists.txt works well but now I don't know how to write wrapper for OPTION and SET functions, can you give me an example? I'm quite new to cmake so another question is: what is the diffence between create a xxx-config and the file I create with INSTALL(EXPORT QXmppClient DESTINATION include/QXmppClient ) ? They seem to do the same thing but probably I'm missing something Nicola Brisotto On Wed, Mar 17, 2010 at 8:44 PM, Alexander Neundorf a.neundorf-w...@gmx.net wrote: On Wednesday 17 March 2010, Michael Wild wrote: On 17. Mar, 2010, at 15:43 , Luigi Calori wrote: ... Is this ExternalProject_Add feature really used/developed? I find it really nice but a little scared of weather it will be really supported and improved. I have done some patching on it but not know if there is a group of user/developer eventually interested to submit mods to It is actively used and developed, but also relatively new. If you have improvements, it's best to create a tracker item with a patch and description there and post the link to the item on this list. Yes. And git support for it would be a really nice thing to have :-) Alex ___ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake ___ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
[CMake] How to build and link Externa Project with exported target
Hi!
I'm building a project that require a 3rd party library libqxmpp. Both project
uses cmake
I want to build libqxmpp with ExternalProject_add, this the code I use:
ExternalProject_add(
libqxmpp
#no download, i'm using git submodule
DOWNLOAD_COMMAND
CMAKE_ARGS
-DQT_QMAKE_EXECUTABLE=/devel/BIN/v4.6.1-git-phonon-dbg-release/bin/qmake
-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/3rdparty/qxmpp-read-only-git/source
)
The problem arise when I try to import a target from libqxmpp adding this to my
project CMakeLists.txt:
#Import libQXmppClient
include(${CMAKE_BINARY_DIR}/include/QXmppClient/QXmppClient.cmake)
Cmake cannot find QXmppClient.cmake because it will be created when I'll build
the project.
How can I solve this problem? Are there better solution to build and link an
external project?
This is the libqxmpp snippet that export the target:
INSTALL(TARGETS QXmppClient EXPORT QXmppClient DESTINATION lib)
INSTALL(EXPORT QXmppClient DESTINATION include/QXmppClient )
Nicola Brisotto
vcard
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Re: [CMake] How to build and link Externa Project with exported target
On 17. Mar, 2010, at 13:17 , Nicola Brisotto wrote:
Hi!
I'm building a project that require a 3rd party library libqxmpp. Both
project uses cmake
I want to build libqxmpp with ExternalProject_add, this the code I use:
ExternalProject_add(
libqxmpp
#no download, i'm using git submodule
DOWNLOAD_COMMAND
CMAKE_ARGS
-DQT_QMAKE_EXECUTABLE=/devel/BIN/v4.6.1-git-phonon-dbg-release/bin/qmake
-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/3rdparty/qxmpp-read-only-git/source
)
The problem arise when I try to import a target from libqxmpp adding this to
my project CMakeLists.txt:
#Import libQXmppClient
include(${CMAKE_BINARY_DIR}/include/QXmppClient/QXmppClient.cmake)
Cmake cannot find QXmppClient.cmake because it will be created when I'll
build the project.
How can I solve this problem? Are there better solution to build and link an
external project?
This is the libqxmpp snippet that export the target:
INSTALL(TARGETS QXmppClient EXPORT QXmppClient DESTINATION lib)
INSTALL(EXPORT QXmppClient DESTINATION include/QXmppClient )
Nicola Brisotto
vcard
There are two ways of getting around this:
1) create the IMPORTED targets yourself.
2) also build your main project wit a ExternalProject_Add and drive the whole
thing from a master-CMakeLists.txt
The first one is probably easier to set up, but requires you to guess the
installation names and paths correctly. The second option requires you to
restructure your whole build system and adds considerable complexity due to the
communication between your master-project and the external projects. For this
communication I'd try the following:
- In the master project do all the feature-detection and setting of cache
variables (such as options etc)
- Write a cache-initializer script to the binary tree
- Do all the ExternalProject_Add calls and specify the cache-initializer script
with the -C option in CMAKE_ARGS
HTH
Michael
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Re: [CMake] How to build and link Externa Project with exported target
Hi Michael and Nicola,
I'm in a similar situation as I' m trying to build up a cmake based
dependency builder for OpenSceneGraph based projects:
So I' m really interested in any best practice advice
Michael Wild wrote:
On 17. Mar, 2010, at 13:17 , Nicola Brisotto wrote:
Hi!
I'm building a project that require a 3rd party library libqxmpp. Both project uses cmake
I want to build libqxmpp with ExternalProject_add, this the code I use:
ExternalProject_add(
libqxmpp
#no download, i'm using git submodule
DOWNLOAD_COMMAND
CMAKE_ARGS
-DQT_QMAKE_EXECUTABLE=/devel/BIN/v4.6.1-git-phonon-dbg-release/bin/qmake
-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/3rdparty/qxmpp-read-only-git/source
)
Means there is a way to instruct
ExternalProject_add
to download from GIT repos? I was not aware of and starting to hack it to
add... let me know if one is available:
I have already added Bazaar download similarly to SVN ... so if there is a way
to share hacking on it
The problem arise when I try to import a target from libqxmpp adding this to my
project CMakeLists.txt:
#Import libQXmppClient
include(${CMAKE_BINARY_DIR}/include/QXmppClient/QXmppClient.cmake)
Cmake cannot find QXmppClient.cmake because it will be created when I'll build
the project.
How can I solve this problem? Are there better solution to build and link an
external project?
This is the libqxmpp snippet that export the target:
INSTALL(TARGETS QXmppClient EXPORT QXmppClient DESTINATION lib)
INSTALL(EXPORT QXmppClient DESTINATION include/QXmppClient )
Sorry my ignorance, this is part of the install step of QXmppClient ?
Nicola Brisotto
vcard
There are two ways of getting around this:
1) create the IMPORTED targets yourself.
2) also build your main project wit a ExternalProject_Add and drive the whole thing from
a master-CMakeLists.txt
The first one is probably easier to set up, but requires you to guess the
installation names and paths correctly. The second option requires you to
restructure your whole build system and adds considerable complexity due to the
communication between your master-project and the external projects. For this
communication I'd try the following:
- In the master project do all the feature-detection and setting of cache
variables (such as options etc)
- Write a cache-initializer script to the binary tree
- Do all the ExternalProject_Add calls and specify the cache-initializer script
with the -C option in CMAKE_ARGS
This suggestion is really interesting:the purpouse is to let any
config options in the master projects to be passed to the slaves?
Have you any examples?
I came up with a schema like 2:
any project is built as external, dependencies are resolved by
ExternalProject_Add and I have used CMAKE_ARGS to communicate settings:
As most of cmake projects were based on FindXXX stuff for finding deps,
I have overridden the necessary modules in order to make the projects
find the good components at configure time.
As I did not yet need a lot of interactive customization, I just passed
common parameters using CMAKE_ARGS
Would not something similar work for you:
keep your project separate from libqxmpp, add to it a
find_package(QXmppClient)
then build a master project where you do:
ExternalProject_add(
libqxmpp
#no download, i'm using git submodule
DOWNLOAD_COMMAND
CMAKE_ARGS
-DQT_QMAKE_EXECUTABLE=/devel/BIN/v4.6.1-git-phonon-dbg-release/bin/qmake
-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/3rdparty/qxmpp-read-only-git/source
)
ExternalProject_Add(your_project_name
DEPENDS libqxmpp
DOWNLOAD_COMMAND
SOURCE_DIR ${CMAKE_SOURCE_DIR}/your project subsource dir
INSTALL_DIR ${CMAKE_INSTALL_PREFIX}
HTH
Luigi
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Re: [CMake] How to build and link Externa Project with exported target
On 17. Mar, 2010, at 14:37 , Luigi Calori wrote:
Hi Michael and Nicola,
I'm in a similar situation as I' m trying to build up a cmake based
dependency builder for OpenSceneGraph based projects:
So I' m really interested in any best practice advice
Michael Wild wrote:
On 17. Mar, 2010, at 13:17 , Nicola Brisotto wrote:
Hi!
I'm building a project that require a 3rd party library libqxmpp. Both
project uses cmake I want to build libqxmpp with ExternalProject_add, this
the code I use:
ExternalProject_add(
libqxmpp
#no download, i'm using git submodule
DOWNLOAD_COMMAND
CMAKE_ARGS
-DQT_QMAKE_EXECUTABLE=/devel/BIN/v4.6.1-git-phonon-dbg-release/bin/qmake
-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/3rdparty/qxmpp-read-only-git/source
)
Means there is a way to instruct
ExternalProject_add
to download from GIT repos? I was not aware of and starting to hack it to
add... let me know if one is available:
I have already added Bazaar download similarly to SVN ... so if there is a
way to share hacking on it
He's not downloading with CMake, he just told git that in this directory is a
submodule. The user has then to fetch it himself with one command:
http://git.wiki.kernel.org/index.php/GitSubmoduleTutorial
[...]
2) also build your main project wit a ExternalProject_Add and drive the
whole thing from a master-CMakeLists.txt
The first one is probably easier to set up, but requires you to guess the
installation names and paths correctly. The second option requires you to
restructure your whole build system and adds considerable complexity due to
the communication between your master-project and the external projects. For
this communication I'd try the following:
- In the master project do all the feature-detection and setting of cache
variables (such as options etc)
- Write a cache-initializer script to the binary tree
- Do all the ExternalProject_Add calls and specify the cache-initializer
script with the -C option in CMAKE_ARGS
This suggestion is really interesting:the purpouse is to let any config
options in the master projects to be passed to the slaves?
Have you any examples?
You could pass every single cache variable using -D in CMAKE_ARGS, but that
becomes pretty tedious very soon... Currently I don't have any example, sorry.
I came up with a schema like 2:
any project is built as external, dependencies are resolved by
ExternalProject_Add and I have used CMAKE_ARGS to communicate settings:
As most of cmake projects were based on FindXXX stuff for finding deps, I
have overridden the necessary modules in order to make the projects find the
good components at configure time.
That's what you could do with the cache-initialization script, no need to
override the FindXXX modules. If more than one of the external projects use the
same FindXXX module, do it in the master and then communicate the results using
the initializer script. This way the user can easily override the results
during the configure-step and get consistent results in all the sub-projects.
Only thing that has me worried is when the user aborts the build, changes the
settings in the master cache and then restarts the build. You'd need to somehow
set up correct dependencies...
If sub-project B does a FIND_PACKAGE(A REQUIRED) and A is built as another
sub-project, then you can specify A_DIR to the B project containing the path to
the directory containing its A-config.cmake.
Michael
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Re: [CMake] How to build and link Externa Project with exported target
[...] He's not downloading with CMake, he just told git that in this directory is a submodule. The user has then to fetch it himself with one command: http://git.wiki.kernel.org/index.php/GitSubmoduleTutorial Sorry ... no git expert at all my point was just to hack ExternalProject_add to let specify different download ways, apart from URL, SVN_REPOSITORY and mine BZR_REPOSITORY would like to have also GIT_REPOSITORY and HG_REPOSITORY [...] 2) also build your main project wit a ExternalProject_Add and drive the whole thing from a master-CMakeLists.txt The first one is probably easier to set up, but requires you to guess the installation names and paths correctly. The second option requires you to restructure your whole build system and adds considerable complexity due to the communication between your master-project and the external projects. For this communication I'd try the following: - In the master project do all the feature-detection and setting of cache variables (such as options etc) - Write a cache-initializer script to the binary tree - Do all the ExternalProject_Add calls and specify the cache-initializer script with the -C option in CMAKE_ARGS This suggestion is really interesting:the purpouse is to let any config options in the master projects to be passed to the slaves? Have you any examples? You could pass every single cache variable using -D in CMAKE_ARGS, but that becomes pretty tedious very soon... Currently I don't have any example, sorry. from http://www.cmake.org/cmake/help/cmake-2-8-docs.html#opt:-Cinitial-cache seems that what you are suggesting is not passing the master cache to the slaves, but to build a selection of variables and build a script in a different format Do you suggesto to pass the same script to ALL the subprojects? I' ll try to find some examples of that usage.seems useful I came up with a schema like 2: any project is built as external, dependencies are resolved by ExternalProject_Add and I have used CMAKE_ARGS to communicate settings: As most of cmake projects were based on FindXXX stuff for finding deps, I have overridden the necessary modules in order to make the projects find the good components at configure time. That's what you could do with the cache-initialization script, no need to override the FindXXX modules. If more than one of the external projects use the same FindXXX module, do it in the master and then communicate the results using the initializer script. This way the user can easily override the results during the configure-step and get consistent results in all the sub-projects. Only thing that has me worried is when the user aborts the build, changes the settings in the master cache and then restarts the build. You'd need to somehow set up correct dependencies... If the cache-initialization script is single, then would be good that all the slave projects file_depends on that but do not know how to set a file dependency on the configure step of ExternalProject_Add If sub-project B does a FIND_PACKAGE(A REQUIRED) and A is built as another sub-project, then you can specify A_DIR to the B project containing the path to the directory containing its A-config.cmake. Yes, that would be good unfortunately not so many cmake projects builds xxx-config.cmake in their build-install process It would be nice to have good examples of usages: this could be a standard way of building dependencies throug cmake . Is this ExternalProject_Add feature really used/developed? I find it really nice but a little scared of weather it will be really supported and improved. I have done some patching on it but not know if there is a group of user/developer eventually interested to submit mods to Thanks Luigi ___ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] How to build and link Externa Project with exported target
On Wednesday 17 March 2010, Michael Wild wrote: On 17. Mar, 2010, at 15:43 , Luigi Calori wrote: ... Is this ExternalProject_Add feature really used/developed? I find it really nice but a little scared of weather it will be really supported and improved. I have done some patching on it but not know if there is a group of user/developer eventually interested to submit mods to It is actively used and developed, but also relatively new. If you have improvements, it's best to create a tracker item with a patch and description there and post the link to the item on this list. Yes. And git support for it would be a really nice thing to have :-) Alex ___ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
