0.  Pre-Checkin Checklist

    Performed from top of repo, default branch, head:

    [ ]  Is tag 'current' at or near head of 'vendor'?

         hg heads
         hg tags

    [ ]  Expected differences between vendor and default?  Very
         little of the original source should be modified.

         hg diff -rcurrent boost

    [ ]  Are the 'vendor' and 'default' branch source directories
         'boost' and not 'boost-<version>'?

    [ ]  Did the iostreams library pick up the correct version of zlib?
         You can run 'strings' over them
         (e.g. boost/stage/lib/release/libboost_iostreams-mt.so) and
         egrep for zlib version string patterns such as '1\\.2\\.'.

         Mac (bad):

         $ strings libboost_iostreams-mt-d.dylib | grep 1\\.2\\.
         1.2.5  <<<<< wrong version
          deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler 
         1.2.8
          inflate 1.2.8 Copyright 1995-2013 Mark Adler 
         1.2.8

         Mac (good):

         $ strings libboost_iostreams-mt-d.dylib | grep 1\\.2\\.
         1.2.8
          deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler 
         1.2.8
          inflate 1.2.8 Copyright 1995-2013 Mark Adler 

         Linux (bad):

         $ strings lib/debug/libboost_* | grep 1\\.2\\.
         1.2.3.4
         1.2.3.4
          deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler 
         1.2.8
          inflate 1.2.8 Copyright 1995-2013 Mark Adler 
         1.2.8
         1.2.3.4
          deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler 
         1.2.8
          inflate 1.2.8 Copyright 1995-2013 Mark Adler 
         1.2.8

         Linux (good):

         $ strings lib/debug/libboost_* | grep 1\\.2\\.
         1.2.8
         1.2.8
          deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler 
         1.2.8
          inflate 1.2.8 Copyright 1995-2013 Mark Adler 
         1.2.8
         1.2.8
          deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler 
         1.2.8
          inflate 1.2.8 Copyright 1995-2013 Mark Adler 
         1.2.8


    [ ]  All DLLs/dylibs/sos built without unwanted references to other
         libraries such as libz.

    [ ]  Confirm compilation with -fPIC on Mac/Linux.

    [ ]  Can the filesystem unit test be re-enabled on Linux or Mac?
         Can the regex unit test be re-enabled post-1.55.0?  Does
         boost::future work on all platforms and can be used now?


1.  Introduction

    Build of boost library from boost.org.

    Repo structure now mostly follows standard conventions (see
    section at end).


2.  Modifications

    Essential modifications to boost distribution.

  2.1  Build Configuration

    * icu4c - pick up the autobuild package in bootstrap.  This is
      then used in the Regex module to provide Unicode string
      matching.  Viewer doesn't use these functions so you don't see
      the icu4c dependency in the viewer.

    * zlib - use autobuild package but use bjam options to locate the
      package.  This doesn't seem to work correctly across the
      platforms so verifying the built libraries on every platform is
      indicated.

    * windows - /Zc:wchar_t- option during build via bjam.

  2.2  Unit Tests - Filesystem Disabled

    2.2.1  Linux

    The Filesystem unit tests fail on some Linux distributions in the
    wide-char filename operations.  This is due to a severely limited
    implementation of the std::codecvt class that fails to convert
    wchar_t to utf-8.  The implication is that filesystem operations
    that use wide character strings types to name files will be
    unreliable on some Linux distributions.  This shouldn't be a
    problem in the viewer where the utf-8 conversion will have
    happened before getting to Boost but be aware of the limitation.
    One result:  Filesystem unit test disabled for Linux.

    2.2.2  Mac

    Boost Bug 9560 details a crash in unit tests which may be another
    problem in the wchar_t-to-utf-8 conversion methods used in the
    filesystem code.  Scope may be greater than unit tests and we
    should take care in letting Boost manage our wide-character
    conversion.

  2.3  Unit Tests - Regex Disabled

    1.55.0 did some damange to the regex unit tests in the no-excep-
    tion-handling case and were disabled.  Should be able to enable
    these in later releases.

  2.4  Unit Tests - Signals fix

    The file 'swap_test.cpp' needed to include '<iostream>'.  Expect
    an equivalent change from upstream in the future (Bug #9555).

  2.5  Thread Library - boost::future damaged on Mac

    I've found evidence that boost::future does not work correctly on
    32-bit Mac (Bug #9558).  For the unit tests, I disable the feature
    with an assortment of -D flags.  For production, don't use the
    boost::future class until its shown to be safe.

  2.6  Unit Tests - Windows

    Many problems building the unit tests on Windows and I eventually
    just gave up with time exhausted.  Revisit when we update the
    library and/or change linkage and/or fix icu4c.

  2.7  Windows Bjam Build

    Had problems running the 'boost/tools/build/v2/engine/build.bat'
    script on my system.  Various branch target labels weren't
    functional.  Putting an 'echo on' command in the ':Test_Empty'
    block after 'setlocal' magically made everything work (mostly).

  2.8  General Build Issues

    Getting a consistent build against dependent libraries is a
    challenge.  Be certain to do the consistency checks above.  I
    don't think all platforms consistently use the ZLIB_* variables
    available so there is some ineffective configuration in the build
    script.  Similarly with bootstrapping, icu4c specification might
    better be handled later, I think.


3.  Source Origin

    1.55.0:
      http://sourceforge.net/projects/boost/files/boost/1.55.0/boost_1_55_0.tar.gz/download


4.  Package Contents

    Common:
    * include/boost/*

    Windows (debug and release, archive only):
    * lib/release/libboost_chrono-mt.lib
    * lib/release/libboost_context-mt.lib
    * lib/release/libboost_date_time-mt.lib
    * lib/release/libboost_filesystem-mt.lib
    * lib/release/libboost_iostreams-mt.lib
    * lib/release/libboost_program_options-mt.lib
    * lib/release/libboost_regex-mt.lib
    * lib/release/libboost_signals-mt.lib
    * lib/release/libboost_system-mt.lib
    * lib/release/libboost_thread-mt.lib
    * lib/debug/libboost_chrono-mt-gd.lib
    * lib/debug/libboost_context-mt-gd.lib
    * lib/debug/libboost_date_time-mt-gd.lib
    * lib/debug/libboost_filesystem-mt-gd.lib
    * lib/debug/libboost_iostreams-mt-gd.lib
    * lib/debug/libboost_program_options-mt-gd.lib
    * lib/debug/libboost_regex-mt-gd.lib
    * lib/debug/libboost_signals-mt-gd.lib
    * lib/debug/libboost_system-mt-gd.lib
    * lib/debug/libboost_thread-mt-gd.lib


    Mac OS X (debug and release, archive only):
    * lib/release/libboost_context-mt.a
    * lib/release/libboost_date_time-mt.a
    * lib/release/libboost_filesystem-mt.a
    * lib/release/libboost_iostreams-mt.a
    * lib/release/libboost_program_options-mt.a
    * lib/release/libboost_regex-mt.a
    * lib/release/libboost_signals-mt.a
    * lib/release/libboost_system-mt.a
    * lib/release/libboost_thread-mt.a
    * lib/debug/libboost_context-mt-d.a
    * lib/debug/libboost_date_time-mt-d.a
    * lib/debug/libboost_filesystem-mt-d.a
    * lib/debug/libboost_iostreams-mt-d.a
    * lib/debug/libboost_program_options-mt-d.a
    * lib/debug/libboost_regex-mt-d.a
    * lib/debug/libboost_signals-mt-d.a
    * lib/debug/libboost_system-mt-d.a
    * lib/debug/libboost_thread-mt-d.a

    Linux (debug and release, archive only):
    * lib/release/libboost_context-mt.a
    * lib/release/libboost_date_time-mt.a
    * lib/release/libboost_filesystem-mt.a
    * lib/release/libboost_iostreams-mt.a
    * lib/release/libboost_program_options-mt.a
    * lib/release/libboost_regex-mt.a
    * lib/release/libboost_signals-mt.a
    * lib/release/libboost_system-mt.a
    * lib/release/libboost_thread-mt.a
    * lib/debug/libboost_context-mt-d.a
    * lib/debug/libboost_date_time-mt-d.a
    * lib/debug/libboost_filesystem-mt-d.a
    * lib/debug/libboost_iostreams-mt-d.a
    * lib/debug/libboost_program_options-mt-d.a
    * lib/debug/libboost_regex-mt-d.a
    * lib/debug/libboost_system-mt-d.a
    * lib/debug/libboost_signals-mt-d.a
    * lib/debug/libboost_thread-mt-d.a


5.  Consumers/Dependents

    Note: Code using Google mock may need to include its headers
    before Boost.  Looks like google-mock changes Boost's inclusion
    behavior.

    Packages dependent on Boost which will need attention
    (autobuild.xml) after changes.  This is not authoritative, use
    appropriate build tools to find all dependents.

    * colladadom
    * google-mock (Not really dependent on Boost, I think.)

    * viewer


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

               Third-Party Library Repo Structure


Introduction

We want to have a way to capture local modifications to a third-party
open-source project, such as libcurl, without needing write access to
their public repository.  We want to be able to carry forward such
modifications to newer versions of the public project.  All this
should be independent of the organizational decision as to whether
it's even desirable to try to submit our local modifications upstream.

Fortunately, the Subversion folks articulated a process years ago that
addresses this very requirement.  They call it "Vendor Branches."  The
same tactic, suitably adapted, works with Mercurial too.

The essence of the idea is that we capture and tag a particular
snapshot of the open-source project.  We develop our local
modifications to that, and the repository tip incorporates them.  But
when we want to update to a newer version of the public project, we
bring it into the repository in such a way that we can discover the
changes from the original snapshot and the new one -- and then have
Mercurial apply those deltas to the ''combined'' source.

The following material is adapted from
http://svnbook.red-bean.com/en/1.1/ch07s05.html, the Red Bean
Subversion book, but recast for Mercurial.  The Linden source for this
material is an internal wiki.  There may be superceding documentation
on the public wiki when you read this.  We recommend searching there
for updates to conventions below.  And note that each particular
library may implement variations of this scheme.


General Vendor Branch Management Procedure

Managing vendor branches generally works like this.  You create a
named branch ("vendor") to store the vendor source snapshots.  Then
you import the third party code into that branch.  Your modified
branch (named "default") is based on "vendor".  You always make your
local changes to the default branch.  With each new release of the
code you are tracking you bring it into the "vendor" branch and merge
the changes into "default", resolving whatever conflicts occur between
your local changes and the upstream changes.

Perhaps an example will help to clarify this algorithm.  We'll use a
scenario where your development team is creating a calculator program
that links against a third-party complex number arithmetic library,
libcomplex.  We'll construct a repository specifically for our
locally-modified version of that library.  To begin, we must
initialize our repository and create at least one file in our
"default" branch.

 $ hg init ourcomplex
 $ cd ourcomplex
 $ touch README.txt
 $ hg commit README.txt

Now we can create the vendor branch and do the import of the first
vendor drop.  We'll call our vendor branch "vendor", and each
successive code drop will be tagged "current".

 $ hg branch vendor
 $ tar -xjf ../libcomplex-1.0.tar.bz2
 $ mv libcomplex-1.0 libcomplex
 $ hg addremove
 $ hg commit -m "1.0 source drop"
 $ hg tag -r tip current
 $ hg tag -r current 1.0

We now have the current version of the libcomplex source code in
branch "vendor", tagged "current" and in a non-version-specific source
code subdirectory ("libcomplex").  Next, we merge it into the default
branch.  It is in the default branch that we will make our
customizations.

 $ hg update default
 $ hg merge vendor
 $ hg commit -m "initial: 1.0"

We get to work customizing the libcomplex code.  Before we know it,
our modified version of libcomplex is now completely integrated into
our calculator program.

A few weeks later, the developers of libcomplex release a new version
of their library, version 1.1, which contains some features and
functionality that we really want.  We'd like to upgrade to this new
version, but without losing the customizations we made to the existing
version.  What we essentially would like to do is to replace our
current baseline version of libcomplex 1.0 with a copy of libcomplex
1.1, and then have Mercurial re-apply the custom modifications we
previously made to that library to the new version.  But we actually
approach the problem from the other direction, applying the changes
made to libcomplex between versions 1.0 and 1.1 to our modified copy
of it.

To perform this upgrade, we update our repository to our vendor
branch, and update the "current" tag with the new libcomplex 1.1
source code.  We quite literally replace the existing files with the
new files, clearing out the whole tree and exploding the libcomplex
1.1 release tarball in its place.  The goal here is to make the tip of
our vendor branch contain only the libcomplex 1.1 code, and to ensure
that all that code is under version control.  Oh, and we want to do
this with as little version control history disturbance as possible.

 $ hg update vendor
 $ rm -rf *
 $ tar -xjf ../libcomplex-1.1.tar.bz2
 $ mv libcomplex-1.1 libcomplex
 $ hg addremove -s 60
 $ # Additional 'hg add' and 'hg rm' commands if needed
 $ hg commit -m "1.1 source drop"

After unpacking the 1.1 tarball, hg status will show files with local
modifications as well as, perhaps, some unversioned or missing files.
If we did what we were supposed to do, the unversioned files are only
those new files introduced in the 1.1 release of libcomplex.  The
missing files are files that were in 1.0 but not in 1.1.  The 'hg
addremove' command deals with both, and more: the '-s 60' switch
directs Mercurial to compare added files to deleted files, recognizing
any file at least 60% similar as a move/rename.

For simple or stable libraries, the 'hg addremove' command should be
reliable.  For more complicated libraries subject to refactoring or
large gaps of time between updates (e.g. libcurl), it can get a little
lost trying to match files in the old release with files in the new
release.  Pay attention to the output of the command or better still,
do dry runs.  Files erroneously moved can be excluded with the '-X'
option and then dealt with individually with 'hg add' and 'hg rm'
commands after 'hg addremove'.  (The readme file in the curl library
should document a particularly challenging case.)

The 'addremove' process doesn't have to be perfect.  Recreating the
evolution of the upstream source tree isn't universally practical.
But we'd like to capture movement of files in the vendor branch that
are modified in the default branch.  If achieving that becomes too
tedious, then re-implementation of the default branch edit in a new
file is fine.  Just note it here for the next developer.

Finally, once our current working copy contains only the libcomplex
1.1 code, we commit the changes we made to get it looking that way.

Our current vendor branch now contains the new vendor drop.  We move
the 'current' tag to the new version (in the same way we previously
tagged the version 1.0 vendor drop), and then merge the differences
between the version 1.0 and version 1.1 into our default branch.

 $ hg tag -f -r tip current
 $ Optional:  hg tag -r current 1.1
 $ hg update default
 $ hg merge vendor
 # resolve all the conflicts between their changes and our changes
 # if you will have conflicts in .hgtags, simply take *all* lines
 ...
 $ hg commit -m "update with 1.1"

Any additional work needed to get the merged library working can
now be done on the default branch.


Revision Tags

We don't currently make use of Mercurial tags in the build and release
process for 3rd-party libraries.  But we would like to establish a
convention to document update and release points.  The tags we would
like to establish are:

 * 'current' Points to a succession of vendor releases checked into
   the 'vendor' branch.  Will almost always be at or close to branch
   head.

 * '<version>' Ttag on the 'vendor' branch pointing to a verbatim
   checkin of a 3rd-party's <version> release.  Example:  '7.21.1' for
   a particular version of libcurl we have used.

 * Release-type tags on the default branch aren't as useful given how
   Mercurial handles tags and how autobuild works.


Schematic of a Third-Party Repository

Below is the output of the 'hg glog' command showing a library project
going through an initial 1.0 release and an update from the vendor to
1.1.  Significant revisions in the repository lifecycle are as
follows:

 0  Creation of the repo with an initial file.
 1  1.0 code drop on branch 'vendor'
 4  Merge of 1.0 code onto branch 'default'
 5  Modifications to library we wish to keep over time.  Released.
 6  1.1 code drop on branch 'vendor'
 9  Merge of 1.1 code onto branch 'default'
10  Fixes to merge yielding production 1.1 library.  Released.
 

@  changeset:   10:888229641f6e
|  tag:         tip
|  user:        Monty Brandenberg <monty@lindenlab.com>
|  date:        Wed Oct 30 13:35:51 2013 -0400
|  summary:     Work to get 1.1 merge working.  Release.
|
o    changeset:   9:925ccdf09f50
|\   parent:      5:83c5775c23dc
| |  parent:      8:977001a08e48
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:35:20 2013 -0400
| |  summary:     update with 1.1
| |
| o  changeset:   8:977001a08e48
| |  branch:      vendor
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:33:49 2013 -0400
| |  summary:     Added tag 1.1 for changeset 5f6cb89add91
| |
| o  changeset:   7:59bce0f6d12f
| |  branch:      vendor
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:33:41 2013 -0400
| |  summary:     Added tag current for changeset 5f6cb89add91
| |
| o  changeset:   6:5f6cb89add91
| |  branch:      vendor
| |  tag:         current
| |  tag:         1.1
| |  parent:      3:8525ad934ecd
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:33:29 2013 -0400
| |  summary:     1.1 source drop
| |
o |  changeset:   5:83c5775c23dc
| |  tag:         1.0
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:32:31 2013 -0400
| |  summary:     Linden-specific changes to the library.  Release
| |
o |  changeset:   4:bccb736585f4
|\|  parent:      0:400e4516c406
| |  parent:      3:8525ad934ecd
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:31:40 2013 -0400
| |  summary:     initial:  1.0
| |
| o  changeset:   3:8525ad934ecd
| |  branch:      vendor
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:30:21 2013 -0400
| |  summary:     Added tag 1.0 for changeset 8ac3828d03bb
| |
| o  changeset:   2:7aa1a1cb62d9
| |  branch:      vendor
| |  user:        Monty Brandenberg <monty@lindenlab.com>
| |  date:        Wed Oct 30 13:30:14 2013 -0400
| |  summary:     Added tag current for changeset 8ac3828d03bb
| |
| o  changeset:   1:8ac3828d03bb
|/   branch:      vendor
|    tag:         1.0
|    user:        Monty Brandenberg <monty@lindenlab.com>
|    date:        Wed Oct 30 13:30:09 2013 -0400
|    summary:     1.0 source drop
|
o  changeset:   0:400e4516c406
   user:        Monty Brandenberg <monty@lindenlab.com>
   date:        Wed Oct 30 13:29:16 2013 -0400
   summary:     Created repo with initial readme file