[CMake] Multiple calls to find_package(Boost) with different components

2009-12-21 Thread Adolfo Rodríguez Tsouroukdissian 
Hi all,

I have a use case where find_package(Boost COMPONENTS xxx) is called more
than once, and each time with a different set of components, as in the
following example:


cmake_minimum_required(VERSION 2.6)
project(MyBoost)

find_package(Boost REQUIRED COMPONENTS date_time)
message(STATUS 1st call: Boost_LIBRARIES=${Boost_LIBRARIES})

find_package(Boost REQUIRED COMPONENTS regex)
message(STATUS 2nd call: Boost_LIBRARIES=${Boost_LIBRARIES})


Upon configuring the project for the first time, everything works as
expected, and the relevant output I get is:
-- 1st call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
-- 2nd call:
Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so;/opt/boost/lib/libboost_regex-mt.so


Now if I clear all non-internal Boost_* cache variables, such as by removing
the Boost group in cmake-gui and reconfigure my project, I get
-- 1st call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
-- 2nd call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so


Which is unexpected. Should the above example work for the two described
scenarios, or am I entering some state that yields undefined behavior?

Thanks in advance,

Adolfo

-- 
Adolfo Rodríguez Tsouroukdissian, Ph. D.

Robotics engineer
PAL ROBOTICS S.L
http://www.pal-robotics.com
Tel. +34.93.414.53.47
Fax.+34.93.209.11.09
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Re: [CMake] Multiple calls to find_package(Boost) with different components

2009-12-21 Thread Marcel Loose 
Hi Adolfo,

I think you already answered your question yourself, though maybe you
didn't realize it. Fortunately you wrote the key phrase

... Now if I clear all non-internal Boost_* cache variables ...

The thing is, FindBoost keeps track of the components it has already
found in internal variables named Boost_component_FOUND. So, if you
don't remove these variables from the cache, you're entering the realm
of undefined behaviour.

I don't know if the author(s) of FindBoost are to blame, e.g., for
possible abuse of internal variables; or that you should never do what
you did. I'm more of a command-line person, so I have no experience with
groups in the cmake-gui.

Best regards,
Marcel Loose.


On Mon, 2009-12-21 at 10:37 +0100, Adolfo Rodríguez Tsouroukdissian
wrote:
 Hi all,
 
 I have a use case where find_package(Boost COMPONENTS xxx) is called
 more than once, and each time with a different set of components, as
 in the following example:
 
 
 cmake_minimum_required(VERSION 2.6)
 project(MyBoost)
 
 find_package(Boost REQUIRED COMPONENTS date_time)
 message(STATUS 1st call: Boost_LIBRARIES=${Boost_LIBRARIES})
 
 find_package(Boost REQUIRED COMPONENTS regex)
 message(STATUS 2nd call: Boost_LIBRARIES=${Boost_LIBRARIES})
 
 
 Upon configuring the project for the first time, everything works as
 expected, and the relevant output I get is:
 -- 1st call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
 -- 2nd call:
 Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so;/opt/boost/lib/libboost_regex-mt.so
 
 
 Now if I clear all non-internal Boost_* cache variables, such as by
 removing the Boost group in cmake-gui and reconfigure my project, I
 get
 
 -- 1st call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
 -- 2nd call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
 
 
 Which is unexpected. Should the above example work for the two
 described scenarios, or am I entering some state that yields undefined
 behavior?
 
 Thanks in advance,
 
 Adolfo
 
 -- 
 Adolfo Rodríguez Tsouroukdissian, Ph. D.
 
 Robotics engineer
 PAL ROBOTICS S.L
 http://www.pal-robotics.com
 Tel. +34.93.414.53.47
 Fax.+34.93.209.11.09
 AVISO DE CONFIDENCIALIDAD: Este mensaje y sus documentos adjuntos,
 pueden contener información privilegiada y/o confidencial que está
 dirigida exclusivamente a su destinatario. Si usted recibe este
 mensaje y no es el destinatario indicado, o el empleado encargado de
 su entrega a dicha persona, por favor, notifíquelo inmediatamente y
 remita el mensaje original a la dirección de correo electrónico
 indicada. Cualquier copia, uso o distribución no autorizados de esta
 comunicación queda estrictamente prohibida.
 
 CONFIDENTIALITY NOTICE: This e-mail and the accompanying document(s)
 may contain confidential information which is privileged and intended
 only for the individual or entity to whom they are addressed.  If you
 are not the intended recipient, you are hereby notified that any
 disclosure, copying, distribution or use of this e-mail and/or
 accompanying document(s) is strictly prohibited.  If you have received
 this e-mail in error, please immediately notify the sender at the
 above e-mail address.
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Re: [CMake] Multiple calls to find_package(Boost) with different components

2009-12-21 Thread Adolfo Rodríguez Tsouroukdissian 
On Mon, Dec 21, 2009 at 12:09 PM, Marcel Loose lo...@astron.nl wrote:

 Hi Adolfo,

 I think you already answered your question yourself, though maybe you
 didn't realize it. Fortunately you wrote the key phrase

 ... Now if I clear all non-internal Boost_* cache variables ...

 The thing is, FindBoost keeps track of the components it has already
 found in internal variables named Boost_component_FOUND. So, if you
 don't remove these variables from the cache, you're entering the realm
 of undefined behaviour.


Ack.



 I don't know if the author(s) of FindBoost are to blame, e.g., for
 possible abuse of internal variables; or that you should never do what
 you did. I'm more of a command-line person, so I have no experience with
 groups in the cmake-gui.


For now, I guess it'll be the latter, to avoid causing undefined behavior.
Thanks for confirming what's going on.

Adolfo.



 Best regards,
 Marcel Loose.


 On Mon, 2009-12-21 at 10:37 +0100, Adolfo Rodríguez Tsouroukdissian
 wrote:
  Hi all,
 
  I have a use case where find_package(Boost COMPONENTS xxx) is called
  more than once, and each time with a different set of components, as
  in the following example:
 
 
  cmake_minimum_required(VERSION 2.6)
  project(MyBoost)
 
  find_package(Boost REQUIRED COMPONENTS date_time)
  message(STATUS 1st call: Boost_LIBRARIES=${Boost_LIBRARIES})
 
  find_package(Boost REQUIRED COMPONENTS regex)
  message(STATUS 2nd call: Boost_LIBRARIES=${Boost_LIBRARIES})
 
 
  Upon configuring the project for the first time, everything works as
  expected, and the relevant output I get is:
  -- 1st call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
  -- 2nd call:
 
 Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so;/opt/boost/lib/libboost_regex-mt.so
 
 
  Now if I clear all non-internal Boost_* cache variables, such as by
  removing the Boost group in cmake-gui and reconfigure my project, I
  get
 
  -- 1st call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
  -- 2nd call: Boost_LIBRARIES=/opt/boost/lib/libboost_date_time-mt.so
 
 
  Which is unexpected. Should the above example work for the two
  described scenarios, or am I entering some state that yields undefined
  behavior?
 
  Thanks in advance,
 
  Adolfo
 
  --
  Adolfo Rodríguez Tsouroukdissian, Ph. D.
 
  Robotics engineer
  PAL ROBOTICS S.L
  http://www.pal-robotics.com
  Tel. +34.93.414.53.47
  Fax.+34.93.209.11.09
  AVISO DE CONFIDENCIALIDAD: Este mensaje y sus documentos adjuntos,
  pueden contener información privilegiada y/o confidencial que está
  dirigida exclusivamente a su destinatario. Si usted recibe este
  mensaje y no es el destinatario indicado, o el empleado encargado de
  su entrega a dicha persona, por favor, notifíquelo inmediatamente y
  remita el mensaje original a la dirección de correo electrónico
  indicada. Cualquier copia, uso o distribución no autorizados de esta
  comunicación queda estrictamente prohibida.
 
  CONFIDENTIALITY NOTICE: This e-mail and the accompanying document(s)
  may contain confidential information which is privileged and intended
  only for the individual or entity to whom they are addressed.  If you
  are not the intended recipient, you are hereby notified that any
  disclosure, copying, distribution or use of this e-mail and/or
  accompanying document(s) is strictly prohibited.  If you have received
  this e-mail in error, please immediately notify the sender at the
  above e-mail address.
  ___
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  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
 
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