Why would you need more than one build directory or more than one IDE project file?This is very useful
- CMake 3.11 introduced the FetchContent module for exactly this purpose: To download 3rdparty dependencies at configuration time and to build them as part of the project itself.
- Every IDE supports CMake (or CMake supports that IDE). More packages use CMake than any other system. So, if you use a library that is designed to be included in your code, you have a choice: Make your own build system, or use one of the provided ones, and that will almost always include CMake.
- Once CMake successfully downloads our external content, it sets two variables that can be used in CMakeLists.txt to locate the new data: SOURCEDIR – specifies the location of the downloaded sources, BINARYDIR – specifies where is the default build directory for the downloaded sources.; Typically, we add that repository to our build system as if it was.
Mastering CMake is a book published by Kitware. # Must be a macro so master file 'cmake/Hunter' can # apply all variables easily just by 'include' command # (otherwise PARENTSCOPE magic needed) macro (HunterGate).
Cmake Documentation
- if you want to use the same set of source files from multiple version of the same IDE (e.g. two Visual Studio versions),
- if you want to have both debug builds (for debugging) and release builds (for performance tests) in parallel,
- if you have your source files stored on a shared network location and want to have build files on two computer and/or operating systems, or
- if you want to build the sources with two different compilers or compiler versions at the same time (e.g. to see whether you can figure out compiler errors better from the messages by another compiler).
The overall idea is very simple: you create one build directory for each variant and call CMake in each of it using different settings.
Tip
A nice side-effect of separating source and build directories is also that you can just delete you build directory and recreate it if you feel that something went wrong configuring your build.
A central question with CMake is the choice of the so called generator. Enter
cmake-G
to get a list of the supported ones. The most common generators are the Unix Makefiles which are default on Linux/Mac/BSD. But there are also specific generators for IDEs, such as Visual Studio, XCode or CodeBlocks.For most of the IDEs further choices like “Release or Debug” are available from the graphical user interface of the IDE, whereas, for the Unix Makefile generator, we can specify the build types using a command line option.Also, the compiler program (and version) can be switched using a command line option.
Shutter count nikon d7200. We assume that your project source is at
~/devel/my_project
.Different compilers:
Please note that the above only works if your compiler is in your PATH. You can instead also specify a full path like
-DCMAKE_CXX_COMPILER=/opt/local/bin/g++-mp-4.9
.Debug and release builds:
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Mastering Cmake Pdf Download
Of course the above can also be combined to have
debug_clang37
et cetera.Caution
64Bit builds on Windows
You almost always want 64Bit builds when using SeqAn, so don’t forget to specify a generator that ends in “Win64”. It is not the default, even on 64Bit Windows installations.
Intel Compiler 2016:
Clang/C2 3.7 or 3.8(requires CMake ≥ 3.6):
Note
If Clang/C2 3.8 is installed, the tool-chain name in Visual Studio 14 isstill “v140_clang_3_7” even though the name says otherwise.
Caution
Clang/C2 is currently experimental and shouldn’t be used in production.
There are several ways to install CMake, depending on your platform.
Windows
There are pre-compiled binaries available on the Download page for Windows as MSI packages and ZIP files. One may alternatively download and build CMake from source. The Download page also provides source releases. In order to build CMake from a source tree on Windows, you must first install the latest binary version of CMake because it is used for building the source tree. Once the binary is installed, run it on CMake as you would any other project. Typically this means selecting CMake as the Source directory and then selecting a binary directory for the resulting executables.
Linux, macOS, UNIX
There are pre-compiled binaries available on the Download page for some UNIX platforms. One may alternatively download and build CMake from source. The Download page provides source releases. There are two possible approaches for building CMake from a source tree. If there is no existing CMake installation, a bootstrap script is provided:
(Note: the make install step is optional, cmake will run from the build directory.)
By default bootstrap will build CMake without any debug or optimization flags. To enable optimizations you will need to specify the
CMAKE_BUILD_TYPE
option to bootstrap like this: ./bootstrap -- -DCMAKE_BUILD_TYPE:STRING=Release
For more options with bootstrap, run
./bootstrap --help
.Or, an existing CMake installation can be used to build a new version:
(Note: the make install step is optional, cmake will run from the build directory.) If you are not using the GNU C++ compiler, you need to tell the bootstrap script (or cmake) which compiler you want to use. This is done by setting the environment variables CC and CXX before running it. For example:
Download Verification
Each release on the Download page comes with a file named cmake-$version-SHA-256.txt, where $version is the release version number.
One may use this file to verify other downloads, such as the source tarball. For example:
One may use this file to verify other downloads, such as the source tarball. For example:
Master Cmake
The SHA-256 file itself can be verified by GPG signature:
Cmake Pdf
The GPG key C6C265324BBEBDC350B513D02D2CEF1034921684 is a signing subkey whose expiry is updated yearly.