This is documentation of the Makefile system used in this tree.

General Overview:
-----------------
This tree builds dozens of open source modules that are each released 
separately and delivered as source in seperate tarballs.   These modules
are organized in subdirectories based on the X.Org module list, though
modules from other sources are included as appropriate.   For instance,
the application xterm is built in open-src/app/xterm, while the fontconfig
library is in open-src/lib/fontconfig.

In this tree, the term "module" is used for a specific set of source built
generally from a single tarball from upstream, such as xterm or fontconfig.
The directories grouping these together are referred to as "module type"
directories - app, lib, font, etc.   Each module is thus found in a 
subdirectory of the form open-src/<module type>/<module> .   Various flags
can be set at either the individual module level or for all modules of a
module type.

For each module, at build time the tarball is unpacked, patches applied for
post-release bug fixes or customizations, and then the build is run.

To allow building both 32-bit and 64-bit versions in the same build,
this all happens in subdirectories named build_32 & build_64 in each
modules' directory.   Since those subdirectories are competely recreatable
from the source tarball and patches, rebuilding the tree or running make clean
simply removes them entirely and recreates them.

You should be able to run make commands in any module directory or
module-type directory, though since most of the intermodule dependencies 
are not declared, many modules will break unless you've done a full-tree
build at some point to populate the proto area with the bits needed.


=============================================================================

Make targets you can build in each module:
------------------------------------------

For most of these you can append _32 or _64 to do just the 32-bit or 64-bit
versions of the targets, while the version listed here repeats for all build
types set in the BUILD_TYPES variable.    These are defined in the 
open-src/common/Makefile.inc file, though open-src/<module type>/Makefile.inc
may add additional rules needed for modules of that type.

make clean
	Completely removes build_* directories.

make source
	Creates build_* directories by unpacking sources from tarball
	and applying patches.

make configure
	Runs GNU autoconf script or similar configuration steps if
	needed, including autoreconf or delibtoolize if variables are set.
	(Runs make source first if needed.)

make build
	Compile the software into the binaries that get installed.
	(Runs make configure first if needed.)

make install
	Install files into the proto area where make_release_packages
	will pull them from to make packages and where other parts of
	the build will use them.   (Runs make build first if needed.)

make all (or just "make" with no arguments)
	equivalent to make build for most modules

make debug
	same as make all, but with compiler optimization flags changed 
	to "-g".  (Note that if you haven't done a make clean first, 
	doesn't force a recompile, so running make debug in a directory 
	you already built non-debug may not actually build debug versions.)

make debug-install
	same as make install, but with compiler optimization flags changed 
	to "-g".  (See warning on make debug about doing a make clean first.)

make download
	If open-src/tarballs does not contain the tarball needed for this
	module, download it from $(SOURCE_URL).   (See "Building from git"
	section below if MODULE_VERSION=git.)

make regen-patches
	Create a directory new/ containing patches generated against the
	current tarball.   Useful when updating to a new version and patches
	still apply, but you want to get rid of warnings about patch fuzz
	and line offsets.

make git-update
	See "Building from git" section below. 

=============================================================================

Make targets you can build in parent directories:
-------------------------------------------------

In the top-level open-src directory, or any of the module type directories,
you can run these make commands to run the appropriate targets for all modules
in that directory.   The Makefiles at each level all include the same rules
from open-src/common/Makefile.subdirs to define these.

make all
	Run make all in all subdirectories.

make clean
	Run make clean in all subdirectories.

make World
	Run make clean in all subdirectories, then make all in all subdirs.

make install
	Run make install in all subdirectories.

make download
	Run make download in all subdirectories.

make source
	Run make source in all subdirectories.

make git-update
	Run make git-update in all subdirectories.

make debug-build
	Run make debug-build in all subdirectories.

make debug-install
	Run make debug-install in all subdirectories.

=============================================================================

Variables that can be set in the Makefile for each module:
----------------------------------------------------------

Required for all modules:

MODULE_NAME
 - Name of the module being built - usually the same as the name of the
   directory it's being built in and the tarball used for the sources.

MODULE_VERSION
 - Version of the source to use, used by default in the tarball name and
   source directory unpacked from it.
   - Special values:  
	"git" - see "Building from git" below
        "src" - used when there is no upstream tarball, only local sources
	"NONE" - used when no build_* directories are created

Required for some modules:

SUN_PACKAGE
 - Package name that this module is shipped in, to list in attributes section
   of man page
 * Required if SUNTOUCHED_MANPAGES is not empty

MODULE_STABILITY
 - Interface Stability to list in attributes section of man page
 * Required if SUNTOUCHED_MANPAGES is not empty

LIBNAME
 - Name of library built in this module
 * Required for lib modules if SUNTOUCHED_MANPAGES is not empty
   or if *.spec files are being used to set library versioning information.

Optional, default is empty:

SOURCE_UNCOMPRESS
 - Command to use to uncompress tarball, if not bzcat

SOURCE_PATCHES
 - Patches to apply to the sources after unpacking the tarball
   Entries can be either a simple file name or filename,flags
   to specify flags to be passed to gpatch.   The flags argument
   is most commonly used to specify -p1 to ignore the a/ & b/ path
   prefixes in git-generated patch files - if no flags are specified,
   -p0 is passed to treat paths as relative to the top of $(BUILD_DIR).

ADDITIONAL_SOURCE_DIR
 - Directory containing additional source files to be linked into the
   build directory by the default_source rule.

SUNTOUCHED_MANPAGES
 - Man pages to add Solaris attributes section and other common Solaris
   man page conventions to, via the open-src/common/suntouch-manpages.pl
   script.

MODULE_SUNTOUCH_MAN_FLAGS
 - Additional flags to pass to open-src/common/suntouch-manpages.pl, such as
   -p /usr/X11/bin to add a path of /usr/X11/bin to the command in the 
   synopsis.   Available flags are:
      -a '{attribute, value}, ...' - entries for Attributes section table
      -l libname                   - add library line to synopsis
      -p path                      - add path to command in synopsis

FIX_PC_FILES
 - Names of pkgconfig .pc or .pc.in files in the module, which will be
   "fixed" to add required -R flags for linking libraries with and remove
   unnecessary Requires.privates lines from.

MODULE_SOURCE_DEPS, MODULE_CONFIGURE_DEPS, 
MODULE_BUILD_DEPS, MODULE_INSTALL_DEPS
 - Makefile targets/rules that the default_* rules list as dependencies

MODULE_ADD_SOURCE_TARGETS, MODULE_ADD_CONFIGURE_TARGETS, 
MODULE_ADD_BUILD_TARGETS, MODULE_ADD_INSTALL_TARGETS
 - Additional targets/rules run by "make source", "make configure", etc.
   in addition to default_* if *_TARGETS is not overridden.

MODULE_CONFIG_OPTS
 - Additional arguments passed to configure script by default_config rule

MODULE_CONFIG_ENV
 - Additional environment variables passed to configure script 
   by default_config rule

MODULE_CFLAGS
 - C Compiler flags passed to configure via CFLAGS variable by
   default_config rule.

MODULE_CXXFLAGS
 - C++ Compiler flags passed to configure via CXXFLAGS variable by
   default_config rule.

MODULE_CPPFLAGS
 - C preprocessor flags (-I & -D) passed to configure via CPPFLAGS 
   variable by default_config rule.

MODULE_DEBUG_FLAGS
 - C Compiler flags passed to configure via CFLAGS variable by
   default_config rule when building debug versions (such as via "make debug")

MODULE_LDFLAGS
 - Linker flags passed to configure via LDFLAGS variable by default_config
   rule.

USE_DEFAULT_CONFIG_CPPFLAGS
 - If set to "no", don't pass the normal set of -I flags in CPPFLAGS
   to configure script in default_config rule.   MODULE_CPPFLAGS and
   MODTYPE_CPPFLAGS will still be passed.

USE_DEFAULT_CONFIG_LDFLAGS
 - If set to "no", don't pass the normal set of linker flags in LDFLAGS
   to configure script in default_config rule.   MODULE_LDFLAGS and
   MODTYPE_LDFLAGS will still be passed.

USE_DEFAULT_CONFIG_ENV
 - If set to "no", don't pass the normal set of default environment variables
   to configure script in default_config rule.  MODULE_CONFIG_ENV and
   MODTYPE_CONFIG_ENG will still be passed.

AUTORECONF
 - If set to "yes", the default_config rule will run autoreconf before
   running configure, to regenerate autoconf/automake/libtool created
   files after patches have been applied to the *.ac/*.am/*.in source files.

DELIBTOOLIZE
 - If set to "yes", the default_config rule will run the script
   open-src/common/delibtoolize.pl to remove libtool calls from Makefiles
   after running configure.

MODULE_LD_OPTIONS
 - Additional options passed via LD_OPTIONS environment variable to
   force options to be used by ld, regardless of options passed by
   libtool/compiler etc.   Used by default_build & default_install rules.

MODULE_BUILD_ENV
 - Additional environment variables passed when calling make
   by default_build & default_install rules

MODULE_MAKEFLAGS
 - Additional command line arguments passed when calling make
   by default_build & default_install

MODULE_BUILD_MAKEFLAGS
 - Additional command line arguments passed when calling make
   by default_build

MODULE_INSTALL_MAKEFLAGS
 - Additional command line arguments passed when calling make
   by default_install

EXTRA_LICENSES
 - Additional files containing copyright & license information for this module,
   beyond what's in LICENSE_FILE, such as subsets for specific packages.
   Will be copied under their own names to $(PROTODIR)/licenses/<path>/
   for use by include statements in package copyright.add files, where
   path is the same as the directory & subdirectory the module source is in.
   Files are looked for relative to module directory, include $(SOURCE_DIR)/
   in the filename to look relative to the top-level source directory.

Optional, with non-empty default:

* Important, for these, to override the default values, you must not only
  set the variable, but set another variable <variable>_SET=yes before the
  Makefile.inc is included to prevent the default from being set.   For
  example:
	SOURCE_URL=http://fontconfig.org/release/$(SOURCE_TARBALL_NAME)
	SOURCE_URL_SET=yes

MODULE_COMPILER
 - Compiler to use, either "suncc" or "gcc".   
   Default: $(DEFAULT_COMPILER) setting in common/Makefile.init, 
   which is set to suncc in the master sources.

MODULE_MAKE
 - make command to use, either "$(MAKE)" or "$(GNUMAKE)".   
   Default: "$(MAKE)" (which is assumed to be Solaris make, not GNU).

MODULE_PREFIX
 - Prefix to install files under, passed to configure scripts via --prefix.
   Default: $(X11_DIR) (aka /usr/X11).

SOURCE_DIRNAME
 - Directory that will be created when the source tarball is unpacked.
   Default: $(MODULE_NAME)-$(MODULE_VERSION)

SOURCE_TARBALL_NAME
 - Name of tarball file under open-src/tarballs directory for this module.
   Set to "NONE" if there is no upstream tarball.
   Default: $(SOURCE_DIRNAME).tar.bz2

SOURCE_TARBALL_DIR
 - For X.Org sources, what directory the source tarball & git repo is in
   on freedesktop.org - usually the same as the module type directory in
   this tree.
   Default: $(MODTYPE)

SOURCE_URL
 - URL to download the SOURCE_TARBALL from when running "make download"
   Default: $(XORG_RELEASES_URL)/$(SOURCE_TARBALL_DIR)/$(SOURCE_TARBALL_NAME)

GIT_URL
 - URL to check out the current sources via the git code manager if 
   MODULE_VERSION is set to "git" - see "Building from git" below
   Default: $(XORG_GIT_URL)/$(SOURCE_TARBALL_DIR)/$(MODULE_NAME).git

BUILD_TYPES
 - What type of output to build for this module - usually the word-size of
   the binaries built (32 and/or 64), but may be set to any string if other
   distinctions are useful.   For most modules that don't build binaries, 
   (fonts, proto headers, docs, etc.) it's set to 32 for simplicity.
   For each value xx in this list, a build_xx directory will be made and
   the source_xx, configure_xx, build_xx and install_xx rules run.
   Default: 32

SOURCE_TARGETS, CONFIGURE_TARGETS, BUILD_TARGETS, INSTALL_TARGETS
 - Makefile targets/rules to run for "make source", "make configure",
   "make build", and "make install"
   Defaults: default_source, default_configure, default_build, default_install
   The *_TARGETS may be appended to by setting the MODTYPE_ADD_*_TARGETS 
   and/or MODULE_ADD_*_TARGETS variables.

AUTOCONF_TARGET
 - File created by running the default_configure rule.   If this file exists,
   make will not run the default_configure rule - if it does not exist, it
   will be run.
   Default: $(SOURCE_DIR)/Makefile

LICENSE_FILE
 - File containing copyright & license information for this module.
   Will be copied to $(PROTODIR)/licenses/<path>/COPYING
   for use by include statements in package copyright.add files, where
   path is the same as the directory & subdirectory the module source is in.
   File is looked for first in module directory, if not found there,
   in top-level source directory (SOURCE_DIR).
   Default: COPYING

MODULE_MTLEVEL
 - For modules in the lib directory, Multi-thread safety level to list in
   attributes section of SUNTOUCHED_MANPAGES
   Default: See XInitThreads(3X11)

=============================================================================

Variables that can be set in the Makefile.inc for each module type:
-------------------------------------------------------------------

Some settings are common to most, if not all of the modules of a given
type.   For those, these variables can be set in 
open-src/<module_type>/Makefile.inc - they have the same meanings and uses
as the MODULE_* versions documented above, and appear in commands before
the MODULE_* versions - the general pattern is
	foo=<tree-wide-defaults> $(MODTYPE_foo) $(MODULE_foo)

Required for all module types:

MODTYPE
 - Name of the directory for this module type, usually the same as the 
   directory for the module type in X.Org's source trees.

Optional, default is empty:

	- MODTYPE_SUNTOUCH_MAN_FLAGS
	- MODTYPE_SOURCE_DEPS
	- MODTYPE_CONFIGURE_DEPS
	- MODTYPE_BUILD_DEPS
	- MODTYPE_INSTALL_DEPS
	- MODTYPE_ADD_SOURCE_TARGETS
	- MODTYPE_ADD_CONFIGURE_TARGETS
	- MODTYPE_ADD_BUILD_TARGETS
	- MODTYPE_ADD_INSTALL_TARGETS
	- MODTYPE_CONFIG_OPTS
	- MODTYPE_CONFIG_ENV
	- MODTYPE_CFLAGS
	- MODTYPE_CXXFLAGS
	- MODTYPE_CPPFLAGS
	- MODTYPE_DEBUG_FLAGS
	- MODTYPE_LDFLAGS
	- MODTYPE_LD_OPTIONS
	- MODTYPE_BUILD_ENV
	- MODTYPE_MAKEFLAGS
	- MODTYPE_BUILD_MAKEFLAGS
	- MODTYPE_INSTALL_MAKEFLAGS

Optional, with non-empty default:

[See note in module variable section about setting _SET variables to override]

	- MODTYPE_COMPILER
	- MODTYPE_MAKE
	- MODTYPE_PREFIX

=============================================================================

Setting per-platform variables:
-------------------------------

open-src/common/Makefile.init defines $MACH to be either sparc or i386
for the platform being built.   You can reference this variable in the
names of other variables to set different values for each platform.
For instance, to build only 64-bit on SPARC, but both 32-bit and 64-bit 
on x86/x64, you can do:

	BUILD_TYPES_sparc=64
	BUILD_TYPES_i386=32 64
	BUILD_TYPES=$(BUILD_TYPES_$(MACH))
	BUILD_TYPES_SET=yes


=============================================================================

Variables you may want to customize for your site/tree:

XORG_RELEASES_URL & SF_DOWNLOADS_URL (set in open-src/common/Makefile.init)
- urls for X.Org & sourceforge mirrors to download tarballs from

FDO_GIT_URL (set in open-src/common/Makefile.init)
- url for git repositories hosted on freedesktop.org, including
  X.Org, Mesa, pixman, etc.  - defaults to anonymous git over http, can 
  change to use another protocol if needed

=============================================================================

Tools for developers to use:

Some tools to ease development are available in the util/build-tools
directory of the tree.

find-build-errors - looks for a log/buildit-XW file (or another file you
	specify on the command line) and tries to isolate out just the
	build errors for easier reading than the raw build logs.   
	If you did buildit -p, also shows packaging errors.

xmake - when you change one file in a large module like xserver and just
	want to rebuild in that subdirectory of the build_32 or build_64
	tree, running xmake will attempt to run make or gmake in that
	directory with the same flags and environment variables that would
	be passed from running make in the module make directory

=============================================================================

Building from git:

For debugging and development purposes, such as working on the merge of
a X.org release still in development, you can choose to  to check out a 
the upstream sources from a the git repository instead of a tarball.

You must *NOT* check in to the master gate a module using this feature,
since this would produce a build that's not reproducible and changing
unexpectedly.

To use this, set MODULE_VERSION to "git" in a module's Makefile.
To check out a branch other than master, add GIT_BRANCH="branch-name".

Once you've done this "make download" will clone the git repo initially, and
"make git-update" will update an existing repo.   The clone will be located
in the $(MODULE_NAME)-git subdirectory in the module directory, and the
"make source" command will copy it instead of unpacking a tarball.

=============================================================================

Known deficiencies (aka TODO):

Things we should fix someday, but haven't had time to do yet, include:

- Builds are slow.   Painfully slow.   Things we might be able to do to
  speed them up include:
	- Using a cache of configure script results shared among all the
	  components in the tree
	- Setting up proper parallel make rules so that multi-core/cpu
	  machines can build more than one bit at a time.
	- Profiling the builds to see where bottlenecks are

- There aren't dependency relationships listed in most of the module
  makefiles - you can't bringover the tree and just cd open-src/xserver/xorg
  and make, because it won't find many of the dependencies - pretty much you
  have to run ./buildit at the toplevel first to build the entire tree and then
  go to work on the module you care about.   It would be cool if it would do
  this for you (like I believe the ON tree does), though tracking down all the
  dependencies will probably take a while - getting them done for xserver/xorg
  first would be most useful.

=============================================================================

Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
Use subject to license terms.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, and/or sell copies of the Software, and to permit persons
to whom the Software is furnished to do so, provided that the above
copyright notice(s) and this permission notice appear in all copies of
the Software and that both the above copyright notice(s) and this
permission notice appear in supporting documentation.

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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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