The Samba Build System
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Object Types
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the build system knows about the following object types

SUBSYSTEM:
	a SUBSYSTEM is basicly a collection of functions, which provide an
	an generic API for a specific problem (e.g. libldb provides an api
	for gneric ldb databases. libldb_plugin provides a generic api
	for calling ldb plugins, so 'libldb' and 'libldb_plugin' are subsystems)

MODULE:
	a MODULE is a specify implementation of a API provided by a SUBSYSTEM.
	(e.g. 'libldb_tdb' and 'libldb_ldap' are implementations of the subsystem 'libldb' API,
	 and 'libldb_plugin_timestamp' is a module of the 'libldb_plugin' subsystem)	

EXT_LIB:
	an EXT_LIB is an external library which is needed by a SUBSYSTEM, MODULE, BINARY or LIBRARY.
	(e.g. 'gtk' or 'KRB5')

BINARY:
	a BINARY means a executable binary file.
	(e.g. 'smbtorture' or 'ldbedit')
	a BINARY typicly has only commandline handling and basic 
	functionality code in it and depends on the functions of
	EXT_LIB's (required_libraries/REQUIRED_LIBRARIES) and/or
	SUBSYSTEM's (required_subsystems/REQUIRED_SUBSYSTEMS).

LIBRARY:
	a LIBRARY means a static and/or shared library,
	which depends on the used OS.
	(e.g. for libldb 'libldb.so', 'libldb.so.0' 'libldb.so.0.0.1'
	      and libldb.a are created on linux)
	a LIBRARY typicly has only glue code in it and depends on
	the functions of EXT_LIB's (required_libraries/REQUIRED_LIBRARIES) 
	and/or SUBSYSTEM's (required_subsystems/REQUIRED_SUBSYSTEMS).


Macrodescriptions
----------------
On top of build/smb_build/public.m4 is a list of all public macros of the build system.


Layout
-------

Toplevel file: configure.in
- included by autogen.sh: aclocal.m4
  which includes the SMB_YXZ*() macros

- default tests of the build system
  are in build/smb_build/check_*.m4
  (mostly compiler and basic C type and function
   checks)

- subsystem specific stuff should be included by 'SMB_INLUDE_M4()'


Generating of 'configure'
-------------------------
you need to rerun ./autogen.sh when 'configure.in' or any
'.m4' file was modified, then you need to rerun configure.


Generating of 'config.status'
-----------------------------
you need to run ./config.status (or 'configure') after a '.mk'
file was changed.


Examples
--------
for now please take a look at the .m4 and .mk files
you find in the source tree, they should be a good reference to start.


README-TODO
------------
SMB_XYZ() vs. SMB_XYZ_MK()
meaning of the macros parameters and the .mk file handling
examples