Add draft of Autotools Primer to The Manual.

git-svn-id: svn://svn.berlios.de/openocd/trunk@1921 b42882b7-edfa-0310-969c-e2dbd0fdcd60

doc/manual/primer/autotools.txt

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+/** @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
+<code>svn update</code>.  Here, the <code>make maintainer-clean</code>
+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 <code>make
+maintainer-clean</code>.  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 <code>make maintainer-clean</code>.  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 <code>make check</code> 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 <code>make distcheck</code> command produces an archive of the
+project deliverables (using <code>make dist</code>) 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 <code>make check</code> to ensure the distributed code passes all tests.
+-# Run <code>make install</code> into a temporary installation directory.
+-# Check that <code>make uninstall</code> removes all files that were installed.
+-# Check that <code>make distclean</code> 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.
+
+ */