Difference between revisions of "CMake"

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CMake is a system for generating per-platform build files.  Visit [http://cmake.org cmake.org] for general information about CMake.  
CMake is a system for generating per-platform build files.  Visit [http://cmake.org cmake.org] for general information about CMake.  


Linden Lab switched to CMake for building the Second Life viewer (starting with version 1.21).
Linden Lab switched to CMake for building the Second Life viewer (starting with version 1.21); we are currently using version 2.8.10.2


= Introduction to CMake =
= Introduction to CMake =
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= Performing a build with CMake =
= Performing a build with CMake =
Our builds are now managed one layer further out then CMake, using [[Autobuild]]; starting there is recommended.


Per platform build instructions for CMake-based builds of the Second Life viewer are available for these platforms:
Per platform build instructions for CMake-based builds of the Second Life viewer are available for these platforms:
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* [[Compiling the viewer (Linux)|Linux]]
* [[Compiling the viewer (Linux)|Linux]]


= Prebuilt libraries vs. standalone builds =
The <code>develop.py</code> script is designed to create a reasonably sane default configuration for you.  By default, this command will configure a "non-standalone" version of the source code tree. This means that the required third party library packages (as built by Linden Lab) will be downloaded during the CMake process.
While many users will want to use the prebuilt libraries that we provide, we're also interested in making life as easy as possible for packagers who want to use their platform's native libraries.
See the links above for details.


= Modifying CMake Files =
= Modifying CMake Files =

Latest revision as of 10:35, 13 February 2013

CMake is a system for generating per-platform build files. Visit cmake.org for general information about CMake.

Linden Lab switched to CMake for building the Second Life viewer (starting with version 1.21); we are currently using version 2.8.10.2

Introduction to CMake

CMake has the advantage of generating per-platform build files for us. On Linux, it will generate Makefiles and KDevelop project files. On OS X, it will generate Makefiles and Xcode project files. On Windows, it will generate Makefiles (for nmake) and Visual Studio project files.

All of the "smarts" stay in the CMake files, so there's just one authoritative source of build knowledge. This means that people can use the development environment they prefer without having to worry so much about breaking other people's builds. Because CMake files are plain text, merging is easy, as is maintaining experimental patches.

CMake tells your build system how to rebuild its input files when it detects changes to CMake's configuration files. This means that you only need to run cmake once. After that, make or your IDE should keep the CMake files and its own project files in sync for you.

Performing a build with CMake

Our builds are now managed one layer further out then CMake, using Autobuild; starting there is recommended.

Per platform build instructions for CMake-based builds of the Second Life viewer are available for these platforms:


Modifying CMake Files

What to modify

'TODO - discuss structure of CMake files

Patching guidelines

We welcome your patches! We can't test on every permutation of platform, compiler, IDE, and libraries, so if you have problems that you can fix, please contribute your fixes and we'll do our best to ensure that you only have to fix problems once.

If you're sending patches in, please follow a few simple guidelines:

  • Follow the existing coding style in the CMake files. I don't like code shouting at me, so prefer lowercase letters.
  • One logical change per patch.
  • Use spaces for indentation, not tabs.

See Submitting patches for more details.