Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Chapter6.Reference

General information

Initialization

bjam's first job upon startup is to load the Jam code that implements the build system. To do this, it searches for a file called boost-build.jam, first in the invocation directory, then in its parent and so forth up to the filesystem root, and finally in the directories specified by the environment variable BOOST_BUILD_PATH. When found, the file is interpreted, and should specify the build system location by calling the boost-build rule:

rule boost-build ( location ? )

If location is a relative path, it is treated as relative to the directory of boost-build.jam. The directory specified by that location and the directories in BOOST_BUILD_PATH are then searched for a file called bootstrap.jam, which is expected to bootstrap the build system. This arrangement allows the build system to work without any command-line or environment variable settings. For example, if the build system files were located in a directory "build-system/" at your project root, you might place a boost-build.jam at the project root containing:

boost-build build-system ;

In this case, running b2 anywhere in the project tree will automatically find the build system.

The default bootstrap.jam, after loading some standard definitions, loads two site-config.jam and user-config.jam.

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