On 08.07.2017 15:06 timothylegg . wrote:
I have CMake installed via apt-get on a few Debian-derived operating
systems. My question is version independent, and I haven't checked,
but I think version 2.8.0+ describes all the machines.
There is a software project that I am wanting to become involved in
that uses cmake, but I have never used makefiles of any sort within
the last 20 years. I have a vague understanding of how they function
and what their goals are, it's just that I've never written anything
that had a level of complexity to require it.
First thing to know here is that CMake is not another kind of make. It's
a build system generator that can - among others - generate Makefiles
for you to run 'make' to build your project.
So lets get to the specifics, the project is open62541.org. Somebody
wrote a wonderful PDF tutorial (link below) that suggests that
compilation flags, such as BUILD_SHARED_LIBS, UA_ENABLE_METHODCALLS,
or UA_ENABLE_AMALGAMATION, but fails to explain exactly how they are
enabled. Would these be passed as parameters to cmake or would they
have to be inserted into a file that the CMake tool suite expects to
find upon execution of cmake?
These are CMake options (aka "cache variables") that can either be
specified on the cmake command line [1] or changed later in one of the
GUI tools that come with CMake. On page 7 in the mentioned PDF file you
can see (for Linux builds):
# select additional features
ccmake ..
make
So you need ccmake to be installed with cmake. On Ubuntu the package
name is "cmake-curses-gui", so if you can't run 'ccmake' you need to
install this. Another option is mentioned under the "Windows" section in
the tutorial, but this is also availabel under Linux: cmake-gui (Ubuntu
package name: "cmake-qt-gui").
Once you launch one of these GUI tools (after running the initial
'cmake' command, but optionally before 'make' you'll see the mentioned
CMake options/variables and can change them interactively. After
changing variables, be sure to run 'configure' and 'generate' within
cmake-gui or ccmake.
Then, exit the GUI and run 'make'.
[1] to specify CMake options on the command line use this syntax:
cmake -D"OPTION=value" -D"OTHER_OPTION=other_value" ..
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