Plane polarizedlight

An example use case of build_requires is a header-only (hpp) C++ library. If your own C++ package includes this library in its own headers, other packages will also need this library at build time (since they may include your headers, which in turn include the hpp headers).

A local install builds and installs the package to the local package repository, which is typically the directory ~/packages. This directory is listed at the start of the package search path, so when you resolve an environment to test with, the locally installed package will be picked up first. Your package will typically be installed to ~/packages/name/version, for example ~/packages/maya_utils/1.0.5. If you have variants, they will be installed into subdirectories within this install path (see Disk Structure for more details).

Polarized and unpolarizedlight

The phenomenon in which electromagnetic waves, such as light waves, vibrate in a preferred plane or planes; or the process of confining the vibrations to certain planes. In unpolarized light the vibrations are equally distributed in all directions perpendicular to the direction of propagation of the wave. If all the vibrations are confined to one plane, the light is said to be plane-polarized (or linearly polarized). If the light in one plane is out of phase with the light in the plane at right angles to it (i.e. if the peaks and troughs of the waves are not in step), then the light is said to be circularly polarized. If all these phenomena occur together, the light is said to be elliptically polarized. Plane polarization is usually caused by scattering, and circular polarization by strong magnetic fields. Circularly and elliptically polarized light can also be produced by a wave plate. See also stokes parameters.

You can add arguments for your build script to the rez-build command directly, by providing a parse_build_args.py source file in the package root directory. Here is an example:

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When rez-build is run on this package, the given build.sh script will be executed with bash. The {root} string expands to the root path of the package (the same directory containing package.py. The {install} string expands to install if an install is occurring, or the empty string otherwise. This is useful for passing the install target directly to the command (for example, when using make) rather than relying on a build script checking the REZ_BUILD_INSTALL environment variable.

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Sometimes it is desirable for a package to depend on another package only for the purposes of building its code, or perhaps generating documentation. Let’s use documentation as an example: a C++ project may need to builds its docs using doxygen, but once the docs are generated, doxygen is no longer needed.

You don’t need to run rez-env after every install. If your package’s requirements haven’t changed, you can keep using the existing test environment.

After you’ve made some code changes, you presumably want to test them. You do this by locally installing the package, then resolving an environment with rez-env to test the package in. The cycle goes like this:

Build utilities. For example, you may have a package called pyqt_cmake_utils, which provides CMake macros for converting ui files to py;

First, some build system plugins add extra options to the rez-build command directly. For example, if you are in a CMake-based package, and you run rez-build -h, you will see cmake-specific options listed, such as --build-target.

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When a rez environment is configured, each required package’s commands() section configures the environment for the building package to use. When a build is occurring, a special variable building is set to True. Your required packages should use this variable to communicate build information to the package being built.

As it happens, the find_package CMake macro searches the paths listed in the CMAKE_MODULE_PATH environment variable, and looks for a file called FindXXX.cmake, where XXX is the name of the package (in this case, Boost), which it then includes.

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Each build occurs within a build path which is typically either a build subdirectory, or a variant-specific subdirectory under build. For example, a package with two python-based variants might look like this:

Second, you can pass arguments directly to the build system, either using the rez-build --build-args option or listing the build system arguments after --.

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The added arguments are stored into environment variables so that your build script can access them. They are prefixed with __PARSE_ARG_; in our example above, the variable __PARSE_ARG_FOO will be set. Booleans will be set to 0/1, and lists are space separated, with quotes where necessary.

Note that commands() is never executed for the package actually being built. If you want to run commands in that case, you can use pre_build_commands() instead.

This is achieved by listing build-time dependencies under a build_requires or private_build_requires section in the package.py. The requirements in private_build_requires are only used from the package being built. Requirements from build_requires however are transitive, build requirements from all packages in the build environment are included.

Rez supports multiple build systems, and new ones can be added as plugins. When a build is invoked, the build system is detected automatically. For example, if a CMakeLists.txt file is found in the package’s root directory, the cmake build system is used.

The short answer is, that is entirely up to you. Rez is not actually a build system. It supports various build systems (as the next section describes), and it configures the build environment, but the details of the build itself are left open for the user. Having said that, CMake has been supported by rez for some time, and rez comes with a decent amount of utility code to manage CMake builds.

The current working directory during a build is set to the build path, not to the package root directory. For this reason, you will typically use the {root} string to refer to a build script in the package’s root directory.

Then, the package’s build_requires is appended. This is transitive, meaning that the build_requires of all other packages in the environment are also used;

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Let’s say I have two C++ packages, maya_utils and the well-known boost library. How does maya_utils find boost’s header files, or library files?

As well as detecting the build system from build files, a package can explicitly specify its own build command, using the build_command package attribute. If present, this takes precedence over other detected build systems.