I am now working on my c++ project. I would like to use CMake targeting multiple platforms in a single build. From the post here
How to make CMake targeting multiple platforms in a single build
It mentioned that we can automate this by having an enclosing build script which invokes CMake once for each target platform and performs several out-of-source builds to distinct binary directories. The enclosing script could also be written in CMake(ExternalProject). I have no idea how to write this automation in Cmake ExternalProject. Could anyone suggest me an idea or give me an example on it?
Related
Is it a good idea to keep googletest source code (say googletest-release-1.8.1.tar.gz) as a part of a C++ project and build it every time the test target is invoked?
My Linux distribution has both gtest and gmock but not all distributions have them. Moreover, nowadays both gtest and gmock are under single repo umberella https://github.com/google/googletest and therefore I'm not sure how gtest and gmock will look like in the future. Having googletest source code as a part of a project would probably solve my concerns. But I'm not sure whether it is inline with the C++ best practices. I could not find any recommended ways doing that in Linux.
Building googletest as a prerequisite of your test target is common practice.
For CMake-managed projects, Googletest documents how to incorporate in an existing CMake project.
For autotools managed projects, How can I use Google Test with my project that builds via autotools?
has a well-regarded solution on SO.
Building googletest as a prerequisite of a project test suite ensures that the googletest code
with which a downstream user of your project builds and runs your tests is the same code
that you built and ran upstream. It ensures that googletest is built with the same compilation
and linkage options as the code under test.
These advantages come at an acceptable cost because Googletest is a cheap build-target whose only dependencies
are the C++ toolchain and pthreads (and even pthreads is optional).
I need to create a cmake project which should be able to be built on linux and windows. So I looked into cmake Tutorials and all of them told me to setup the build process by hand. Bit looking at other projects made with cmake, the scripts seam like they were created by a computer (no formatting no comments). So I was wondering if there was a more automated aproach or tool that can be used for cmake files. Or are most cmake scripts really written by hand?
Yes, CMakeLists.txt are generally written by hand. Generated are SomeProjectConfig.cmake modules, which contain exported targets and information how the project was built. These modules are used by find_package command when you want to use SomeProject from your own project.
I'm trying to use KDevelop as an IDE for development of a C++ shared library. An earlier posts here indicate that I need to edit a CMake makefile for doing that. This is quite painful and very time consuming as it means converting our custom gmake-oriented build system into something of CMake.
Is there any other way for doing that?
KDevelop doesn't force you to use a specific buildsystem like many other IDEs do. CMake is just the default as it's very well integrated and many if not all KDE projects use cmake.
You can use a different build system by choosing "Custom Buildsystem" or "Custom Makefile Project Manager".
Custom Makefile Project Manager simply calls "make" - your current build system should work this that.
I come from a unixy background, so tend to prefer command-line style automation over ide's.
I'm tryng to get deeper into windows development. I have previously written programs on Windows just using the cl compiler to compile the c code. I'd like to move to an automated build system like cmake.
I can get cmake to create an Visual Studio solution, which will compile. But that is not quite what I am looking for. What I am looking for is for cmake to invoke to cl to compile/link the code itself, just like make invokes gcc.
Is cmake able to do this or would Scons be better suited for me?
Once you have your project created with CMake, cmake can also run the build.
cd builddir
cmake --build .
You can also use CMake to create nmake or jom (parallel nmake) makefiles, or even gmake. So, it is certainly possible to use CMake from the command line and use VS compilers.
Found out, as per Peter's comment, that cmake is a build-generator tool. It's generates makefiles that external build tools can run. So I'll either use cmake+namke or scons.
Im not so sure about cmake, but SCons has some builders dedicated just to Microsoft Visual Studio.
Look for the following in the SCons builder documentation:
MSVSProject()
MSVSSolution()
Plus SCons has a much nicer syntax, its python! :)
I'm having some difficulties with cmake (2.8.7) and Eclipse + CDT (3.7.1). I'm using a CMakeBuilder (http://www.cmakebuilder.com/), which I found via the search function here. Actually I thought, that'd be it.
Problem is that it does not provide any import function either: So I need cmake to generate Eclipse CDT4 Makefiles initially, which requires me to maintain two separate build systems and to work on copies. One for deployment, one for development.
Furthermore I'd need to copy my changes over into the original project, file by file, because I can just work on copies, that cmake generates together with the Makefiles. At the end: twice the work. Double-check integration each time.
Is there anything one can do to work directly on a cmake project from Eclipse (or another sane IDE)? Mainly I need good C++ editing (very large set of libs, so the paths are a major problem, and cmake searches for these on every platform). I could maintain cmake on my own, but Eclipse (and other IDEs) miss a useful import settings. Some IDE would be nice though. ;)
Best,
Marius
As I remember KDevelop4 has native support. In other hand: why don't edit CMakeLists.txt directly as a simple script (from an editor*) and use the official GUI? I haven't used Eclipse with CMake, but in Visual Studio the solution is generated automatically after editing any of project or solution CMakeLists.txt file. I expect something similar from Eclipse, too.
Eclipse CDT4 Generator
More info.
*: Notepad++ has highlight for CMake files.