/** @page primerautotools OpenOCD Autotools Primer This page provides an overview to OpenOCD's use of the GNU autotool suite: - @ref primerautoconf - @ref primerautomake - @ref primerlibtool Most developers do not need to concern themselves with these tools, as the @ref primerbootstrap script runs these tools in the required sequence. @section primerbootstrap Autotools Bootstrap The @c bootstrap script should be used by developers to run the autotools in the correct sequence. When run after a fresh checkout, this script generates the build files required to compile the project, producing the project configure script. After running @c configure, the @ref primermaintainermode settings will handle most situations that require running these tools again. In some cases, a fresh bootstrap may be still required. @subsection primerbootstrapcures Problems Solved By Bootstrap For example, the build system can fail in unexpected ways after running svn update. Here, the make maintainer-clean should be used to remove all of the files generated by the @c bootstrap script and subsequent build processes. In this particular case, one may also need to remove stray files by hand after running this command to ensure everything is rebuilt properly. This step should be necessary only if the @c maintainer-clean was run @b after altering the build system files with Subversion. If it is run @b before any updates, the build system should never leave artifacts in the tree. Without such precautions, changes can be introduced that leave the tree timestamps in an inconsistent state, producing strange compile errors that are resolve after such diligence. @subsection primermaintainerclean Autotools Cleaning Normally, all files generated by the bootstrap script, configure process, and build system should be removed after running make maintainer-clean. Automatically generated files that remain after this should be listed in @c MAINTAINERCLEANFILES, @c DISTCLEANFILES, or @c CLEANFILES, depending on which stage of the build process they are produced. @section primerautoconf Autoconf Configuration Script The @c autoconf program generates the @c configure script from @c configure.in, using serious Perl voodoo. The resulting script is included in the project distribution packages and run by users to configure the build process for their system. @subsection primermaintainermode Maintainer Mode After a fresh checkout, @c bootstrap, and a simple @c configure, you may experience errors when running @c make that some files cannot be found (e.g. @c version.texi), and a second @c make will "mysteriously" solve the problems. The isssue is well-known and expected, if unfortunate. The OpenOCD project requires that all developers building from the Subversion repository use the @c --enable-maintainer-mode option when running the @c configure script. This option ensures that certain files are created during the build process that would normally be packaged in the distribution tarball. The @c bootstrap script will remind you of this requirement when it runs. In addition to solving these problems, this option enables Makefile rules (provided by automake) that allow the normal @c make process to rebuild the autotools outputs, included the automake-generated Makefiles themselves. This avoids the heavy-handed approach of running the @c bootstrap script after changing one of these files. @section primerautomake Automake Makefiles The @c automake program generates @c Makefile.in files (from @c Makefile.am files). These files are later processed by the configure script produced by @c autoconf. @subsection primerautomakenewfiles Creating Makefile.am Files This section shows how to add a @c Makefile.am in a new directory (or one that lacks one). -# The new directory must be listed in the @c SUBDIRS variable in the parent directory's Makefile.am: @code $ echo 'SUBDIRS += directory' >>../Makefile.am @endcode -# Create an bare-bones Makefile.am file in directory that needs it: @code $ echo "MAINTAINERCLEANFILES = Makefile.in" >Makefile.am @endcode -# The @c configure.in script must be updated, so it generates the required Makefile when the @a configure script is run by the user: @verbatim AC_OUTPUT([ ... path/to/new/Makefile ]) @endverbatim Note: these instructions are @b not meant to be used literally, rather they are shown for demonstration purposes. The default MAINTAINERCLEANFILES rule ensures that the automake-generated @c Makefile.in file will be removed when developers run make maintainer-clean. Additional rules may be added after this; however, the project should bootstrap and tear down cleanly after taking these minimal steps, with the new directory being visited during the @c make sequence. @subsection primerautomaketweaks Updating Makefile.am Files Adding, removing, and renaming files from the project tree usually requires updating the autotools inputs. This section will help describe how to do this as questions arise. @section primerlibtool Libtool and Libraries The @c libtool program provides the means of generating libraries in a portable and painless manner (relatively speaking). This section will contain an answer to "what does libtool give OpenOCD?" and "what do developers need to consider in new code?" @section primerautotoolsmation Autotools Automation This section outlines three ways the autotools provides automation to assist with testing and distribution: - @ref primerautocheck -- automatic unit and smoke tests - @ref primerautodistcheck -- automatic distribution and packaging tests @subsection primerautocheck make check The make check command will run the OpenOCD test suite, once it has been integrated as such. This section will contain information about how to extend the testing build system components to implement new checks. @subsection primerautodistcheck make distcheck The make distcheck command produces an archive of the project deliverables (using make dist) and verifies its integrity for distribution by attemptng to use the package in the same manner as a user. These checks includes the following steps: -# Unpack the project archive into its expected directory. -# Configure and build the project in a temporary out-of-tree directory. -# Run make check to ensure the distributed code passes all tests. -# Run make install into a temporary installation directory. -# Check that make uninstall removes all files that were installed. -# Check that make distclean removes all files created during all other steps (except the first). If all of these steps complete successfully, the @c make process will output a friendly message indicating the archive is ready to be distributed. */ /** @file This file contains the @ref primerautotools page. */