In addition, FreeBSD systems require kernel sources and a configured kernel
build directory (see section "FreeBSD Notes" in the README file).
+
+GIT Usage
+=========
+
+*WARNING* *WARNING* *WARNING* *WARNING* *WARNING* *WARNING* *WARNING*
+The Git tree may not always have code which can currently be built.
+While every effort is made to keep the head of the tree buildable,
+you may at any time find yourself between commits and hence have a tree
+which does not build, or worse, causes more serious problems!
+
+Do not use the Git tree unless you know what you're doing.
+
+Git checkouts do not include files generated by autoconf. You can
+run regen.sh (at the top level) to create these files. You will need
+to have autoconf and automake installed on your system.
+
+Summary
+-------
+
+Browse: http://git.openafs.org/
+Clone: git clone git://git.openafs.org/openafs.git
+
+Step-by-step
+------------
+
+1. Obtain the Git software. If you are using a system with a standard
+ software repository, Git may already be available as a package named
+ something like git or git-core. Otherwise, go to http://git-scm.com/
+
+2. Run the command:
+
+ % git clone git://git.openafs.org/openafs.git
+
+ This will download the full repository and leave a checked-out tree in
+ a subdirectory of the current directory named openafs. The repository
+ itself is in the .git subdirectory of that directory.
+
+ WARNING: The repository is approximately 60MiB currently and will only
+ grow, so it may take some time to download the first time over a slow
+ network connection.
+
+3. Generate the additional required files:
+
+ % cd openafs
+ % ./regen.sh
+
+The current development series is in the branch named master. The stable
+releases are on separate branches named something like
+openafs-stable_<version> with a separate branch for each major stable
+release series. Use git branch -a to see a full list of branches.
+
+OpenAFS uses the Gerrit code review system to review and merge all changes
+to OpenAFS. More details are at:
+
+ http://wiki.openafs.org/GitDevelopers/
+
+including more detailed Git instructions.
+
+It's by far preferred to use Gerrit to submit code changes, but if you
+can't for whatever reason, you can instead open a bug and submit a patch
+that way. Do this by sending mail to openafs-bugs@openafs.org with the
+patch attached. But please use Gerrit if you can; patches sent in as bugs
+will have to be forwarded to Gerrit by someone else, and it's easier for
+everyone if you can enter them into Gerrit yourself.
+
+Backport policy
+------------
+All patches should land on master first, unless the patch fixes a bug
+that only exists in the stable branch.
+
+Once a patch has been accepted into master, anyone can propose
+backports to stable branches.
+
+When cherry-picking a commit from another branch, please append a
+"cherry picked from" section in your commit message. You'll also need
+a separate Change-ID for Gerrit to recognize this as a separate
+change. One workflow to do this:
+
+1) Use "git cherry-pick -ex" to pick your commits onto another branch.
+ The -x option will append the appropriate "cherry picked from"
+ message, and the -e option will open your editor for you to edit
+ the commit message.
+2) In your editor, delete the existing Change-ID line. Save and quit.
+3) Run "git commit --amend", saving and quitting again. Git will run
+ the commit hook and generate a new Change-ID for Gerrit.
+
+Warnings
+========
+
+OpenAFS Warning detection
+-------------------------
+
+There's been a concerted effort over the last few years, by many developers,
+to reduce the number of warnings in the OpenAFS tree. In an attempt to
+prevent warnings from creeping back in, we now have the ability to break the
+build when new warnings appear.
+
+This is only available for systems with gcc 4.2 or later, and is disabled
+unless the --enable-checking option is supplied to configure. Because we
+can't remove all of the warnings, we permit file by file (and warning by
+warning) disabling of specific warnings. The --enable-checking=all prevents
+this, and errors for any file containing a warning.
+
+Disabling warnings
+------------------
+
+If warnings are unavoidable in a particular part of the build, they may be
+disabled in an number of ways.
+
+You can disable a single warning type in a particular file by using GCC
+pragmas. If a warning can be disabled with a pragma, then the switch to use
+will be listed in the error message you receive from the compiler. Pragmas
+should be wrapped in IGNORE_SOME_GCC_WARNINGS, so that they aren't used
+with non-gcc compilers, and can be disabled if desired. For example:
+ #ifdef IGNORE_SOME_GCC_WARNINGS
+ # pragma GCC diagnostic warning "-Wold-style-definition"
+ #endif
+
+It would appear that when built with -Werror, the llvm clang compiler will
+still upgrade warnings that are suppresed in this way to errors. In this case,
+the fix is to mark that warning as ignored, but only for clang. For example:
+ #ifdef IGNORE_SOME_GCC_WARNINGS
+ # ifdef __clang__
+ # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+ # else
+ # pragma GCC diagnostic warning "-Wdeprecated-declarations"
+ # endif
+ #endif
+
+If a pragma isn't available for your particular warning, you will need to
+disable all warnings for the file in question. You can do this by supplying
+the autoconf macro @CFLAGS_NOERROR@ in the build options for the file. For
+example:
+ lex.yy.o : lex.yy.c y.tab.c
+ ${CC} -c ${CFLAGS} @CFLAGS_NOERROR@ lex.yy.c
+
+If you add a new warning inhibition, please also add it to the list below.
+
+Inhibited warnings
+------------------
+
+afs/afs_syscall.c : old-style
+ : strict-proto
+ : all (ukernel) : syscall pointer issues
+afsd/afsd_kernel.c : deprecated : daemon() marked as deprecated on Darwin
+auth/ktc.c : all (ukernel) : call_syscall doesn't have a prototype
+bozo/bosserver.c : deprecated : daemon() marked as deprecated on Darwin
+bucoord/ubik_db_if.c : strict-proto : Ubik_Call
+bucoord/commands.c : all : Ubik_Call
+ : signed vs unsigned for dates
+butc/tcudbprocs.c : all : ubik_Call
+external/heimdal/hcrypto/validate.c: all: statement with empty body
+kauth/admin_tools.c : all : signed vs unsigned for dates
+kauth/authclient.c : strict-proto : ubik_Call nonsense
+libadmin/kas/afs_kasAdmin.c: all : Ubik_Call nonsense
+libadmin/samples/rxstat_query_peer.c : all : util_RPCStatsStateGet types
+libadmin/samples/rxstat_query_process.c : all : util_RPCStatsStateGet types
+libadmin/test/client.c : all : util_RPCStatsStateGet types
+rxkad/ticket5.c : all : v5gen.c has set-but-unused variables
+ubik/ubikclient.c : strict-protos : ubik_Call
+volser/vol-dump.c : format : afs_sfsize_t
+