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

[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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