Andrew Maclean wrote:
Bill, If you think it is generally OK and useful to people, tell me what
improvements are needed before it would be eligible for inclusion in the
modules directory of CMake.
This will definately be a useful contribution.
I have had a go at writing a FindBoost.cmake file (attached). It tries
to find where the boost includes are using "educated guesses" and then
tries to determine the path to the library files. The problem with
windows is that there is no "default" library path.
Is there a better way of doing this for both windows and linux? I have
searched the web but most examples are just for linux and only seem to
do part of the job.
Does Boost suggest that any environment variables be set for its
location? Does it set any registry entries on Windows?
The rationale for my solution is outlined below.
I think my solution is a bit rough around the edges but pointing in the
right direction. For example:
If I have a path like /usr/local/include/boost-1_33_1/boost
How can I get the /usr/local part so I can append /lib to it?
Using GET_FILENAME_COMPONENT is fine, but you may not need to strip as
much as you are now.
The problem is that I could have a paths like:
/user/local/include/boost
/user/include/boost-1_33_1/boost
/user/local/include/boost
C:\boost\include\boost
C:\boost\include\boost\boost-1_33_1\boost
My problem is that I want to set up a BOOST_INCLUDE_PATH (easy, just
look for a file like config.hpp).
The hard part is determining the library path it is either:
${BOOST_INCLUDE_PATH}/../../../lib
or
${BOOST_INCLUDE_PATH}/../../lib
What determines during boost installation which of these paths is used?
I'm guessing it is whether the version number was included in the
install directory..
You can see from the attached code that I used a series of IF ( EXISTS ...
Is this the best way to do this?
# Usage:
# In your CMakeLists.txt file do something like this:
# ...
# # Boost
# INCLUDE(FindBoost.cmake)
This should be
FIND_PACKAGE(Boost)
The module should also pay attention to the variable
Boost_FIND_REQUIRED. If it is set and boost is not found it should exit
with a MESSAGE(FATAL_ERROR ...). The variable is set by the
FIND_PACKAGE command when it loads the module if it is called like this:
FIND_PACKAGE(Boost REQUIRED)
For finding the include path, look at the PATH_SUFFIXES option of the
FIND_PATH command. You should be able to find the headers like this:
FIND_PATH(BOOST_INCLUDE_DIR
NAMES boost/config.hpp
PATH_SUFFIXES boost-1_33_1 ...)
Then you will not need to strip the boost/ part of the path, and the
sub-path boost-1_33_1 will be searched underneath every other search
path specified. Then you can use code like
IF("${BOOST_INCLUDE_DIR}" MATCHES "boost-[0-9]+_[0-9]+")
to test how many levels need to be stripped to find the PREFIX/lib
directory.
-Brad
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