This directory contains tools.  Do not attempt to actually build
anything in this directory.

The Build script allows you to specify a base location for the object
files by using the -O flag:

	Build -O /tmp

will put the object files in /tmp/obj.*/.  Also, if the SENDMAIL_SUFFIX
environment variable is set, its value will be used in the obj.* directory
name.

The Build script allows you to specify a site configuration file by using
the -f flag:

	Build -f siteconfig.m4

You can put such site configuration files in the Site sub-directory;
see Site/README for details.

If you need to support multiple build configurations from the same tree,
you can use prefixes to differentiate your configurations.  Use the -Q
flag to Build:

	Build -Q prefix

Build will select a prefix.*.m4 file instead of the site.*.m4 file according
to the conventions in Site/README, and use it to modify the build
configuration.  The object directory used will be obj.prefix.*/.  Your
prefix.*.m4 files should reside in the Site directory.  You may not use
-Q and -f simultaneously.

While building a site configuration file, beyond using define() to set
variables, you can also add to a definition using the APPENDDEF() and
PREPENDDEF() macros.  For example:

	APPENDDEF(`confINCDIRS', `-I/usr/local/bind/include')

will add -I/usr/local/bind/include to the already existing confINCDIRS.
Note: There must be no trailing spaces after the last quote mark and
before the closing parenthesis.  Also you may need to properly quote
m4 reserved words as specified by your vendor's m4 command.

By default, sendmail will search your system for include and library
directories as well as certain libraries (libdb.* for Berkeley DB and
libbind.a or libresolv.* for name resolution).  You can turn off this
configuration step by specifying the -S flag with the Build command.

The OS subtree contains definitions for variations on a standard
model for system installation.  The M4 variables that can be defined
and their defaults before referencing the appropriate OS definitions
are listed below.  Note that variables preceded by an asterisk (*)
are currently not used in the open source distribution.

confBEFORE	    [empty]		Files to create before sendmail is
					compiled.  The methods must be defined
					in the Makefile using PUSHDIVERT(3).
confBLDVARIANT	    OPTIMIZED		This controls which object variant will
					be built and is controlled with the
					-v flag to the Build
					script. Internally, this macro is
					used to select compiler options in
					the devtools/OS/*.m4 files.  Valid
					arguments for the Build -v flag are
					"optimized", "debug", and "purify"
					which map to confBLDVARIANT values
					of "OPTIMIZED", "DEBUG", and
					"PURIFY".  This is a work in
					progress, and as such not all
					devtools/OS/*.m4 have been updated
					yet. (See Linux for an example of
					one that has.)  Also, in the future
					it may be desirable to append a
					variant identifier to the object
					directory name to allow different
					variants to independently co-exist
					on a given target platform.  Note:
					the PURIFY variant has not been
					fully implemented on any platforms
					yet. Other variants can be added as
					needed in the future. Changing this
					macro from its default will effect
					other default values.
confBUILDBIN	    ../../devtools/bin	The location of the build support
					binaries, relative to the obj.*
					directory.
confCC		    cc			The C compiler to use.
confCCOPTS	    [empty]		Additional options to pass to confCC.
*confCCOPTS_SO	    -fPIC		Additional options for compiling
					shared object libraries.
confCOPY	    cp			A program that copies files.
confDEPEND_TYPE	    generic		How to build dependencies.  This should
					be the name of a file in
					devtools/M4/depend
confDEPLIBS	    [empty]		Dependent libraries when building 
					shared objects.	
confEBINDIR	    /usr/libexec	The location for binaries executed
					from other binaries, e.g., mail.local
					or smrsh.
confENVDEF	    [empty]		-D flags passed to C compiler.
confFORCE_RMAIL	    [undefined]		If defined, install the rmail program
					without question.
confHFDIR	    /etc/mail		Location of the sendmail helpfile.
confHFFILE	    helpfile		Name of the installed helpfile.
confINCDIRS	    [empty]		-I flags passed to C compiler.
confINCGRP	    bin			The group for include files.
confINCMODE	    444			The mode of installed include files.
confINCOWN	    root		The owner for include files.
confINCLUDEDIR	    /usr/include	Where to install include files.
confINSTALL	    install		The BSD-compatible install program.
					Use ${BUILDBIN}/install.sh if none
					is available on your system.
confINSTALL_RAWMAN  [undefined]		Install the unformatted manual pages.
*confLD		    confCC		Linker to use.
confLDOPTS	    [empty]		Linker options passed to ld.
*confLDOPTS_SO	    -shared -Wl		Additional linker options for
					linking shared object libraries.
confLIBDIR	    /usr/lib		Where to install library files.
confLIBDIRS	    [empty]		-L flags passed to ld.
confLIBGRP	    bin			The group for libraries.
confLIBMODE	    444			The mode of installed libraries.
confLIBOWN	    root		The owner for libraries.
confLIBS	    [varies]		-l flags passed to ld.
confLIBSEARCH	    db bind resolv 44bsd
					Search for these libraries for
					linking with programs.
confLIBSEARCHPATH   /lib /usr/lib /usr/shlib
					Locations to search for the
					libraries specified by confLIBSEARCH.
confLINKS	    ${UBINDIR}/newaliases ${UBINDIR}/mailq \
		    ${UBINDIR}/hoststat ${UBINDIR}/purgestat
					Names of links to sendmail.
confLN		    ln			The command used to create links.
confMAN1	    confMANROOT 1	The location of man1 files.
confMAN1EXT	    1			The extension on files in confMAN1.
confMAN1SRC	    0			The source for man pages installed
					in confMAN1.
confMAN3	    confMANROOT 3	The location of man3 files.
confMAN3EXT	    3			The extension on files in confMAN3.
confMAN3SRC	    0			The source for man pages installed
					in confMAN3.
confMAN4	    confMANROOT 4	The location of man4 files.
confMAN4EXT	    4			The extension on files in confMAN4.
confMAN4SRC	    0			The source for man pages installed
					in confMAN4.
confMAN5	    confMANROOT 5	The location of man5 files.
confMAN5EXT	    5			The extension on files in confMAN5.
confMAN5SRC	    0			The source for man pages installed
					in confMAN5.
confMAN8	    confMANROOT 8	The location of man8 files.
confMAN8EXT	    8			The extension on files in confMAN8.
confMAN8SRC	    0			The source for man pages installed
					in confMAN8.
confMANDOC	    -man		The macros used to format man pages.
confMANGRP	    bin			The group of installed man pages.
confMANMODE	    444			The mode of installed man pages.
confMANOWN	    bin			The owner of installed man pages.
confMANROOT	    /usr/share/man/cat	The root of the man subtree.
confMANROOTMAN	    /usr/share/man/man	The root of the man subtree, for
					unformatted manual pages.
confMAPDEF	    [varies]		The map definitions, e.g.,
					-DNDBM -DNEWDB.  -DNEWDB is always
					added if libdb.* can be found.
confMBINDIR	    /usr/sbin		The location of the MTA (sendmail)
					binary.
*confMTCCOPTS	    [empty]		Additional options for compiling
					multi-threaded object files.
*confMTLDOPTS	    [empty]		Additional linker options for
					linking multithreaded binaries.
confNO_HELPFILE_INSTALL  [undefined]	If defined, don't install the sendmail
					helpfile by default.
confNO_MAN_BUILD    [undefined]		If defined, don't build the man
					pages.
confNO_MAN_INSTALL  [undefined]		If defined, don't install the man
					pages by default.
confNO_STATISTICS_INSTALL  [undefined]	If defined, don't install the sendmail
					statistics file by default.
confNROFF	    groff -Tascii	The command to format man pages.
confOBJADD	    [empty]		Objects that should be included in
					when linking sendmail and the
					associated utilities.  See also
					confSRCADD.
confOPTIMIZE	    -O			Flags passed to C compiler as ${O}.
confRANLIB	    echo		The path to the program to use
					as ranlib.
confRANLIBOPTS      [empty]		Options to pass to ranlib.
confSBINDIR	    /usr/sbin		The location of root-oriented
					commands, such as makemap.
confSBINGRP	    bin			The group for setuid binaries.
confSBINMODE	    4555		The mode for setuid binaries.
confSBINOWN	    root		The owner for setuid binaries.
confSHAREDLIB_EXT   .so              	Shared library file extenion name.
confSHAREDLIB_SUFFIX [empty]		Shared object version suffix.	
confSHAREDLIBDIR    /usr/lib		Directory for installing shared 
					library. 
confSHELL	    /bin/sh		The shell to use inside make.
confSMOBJADD	    [empty]		Objects that should be included in
					when linking sendmail.  See also
					confSMSRCADD.
confSMSRCADD	    [empty]		C source files which correspond to
					objects listed in confSMOBJADD.
confSMSRCDIR	    [varies]		The sendmail source directory
					relative to support program obj.*
					directories.  If not set, the
					Makefile will use a path set by the
					Build script.
confSRCADD	    [empty]		C source files which correspond to
					objects listed in confOBJADD.
confSRCDIR	    [varies]		The root of the source directories
					relative to support program obj.*
					directories.  If not set, the
					Makefile will use a path set by the
					Build script.
confSONAME	    [empty]		ld flag	for recording the shared object
					name into shared object.
confSTDIO_TYPE	    portable		Buffered file implementation
					(based on stdio library).  Either
					portable or torek.
confSTDIR	    /etc/mail		The directory in which to store the
					sendmail statistics file.
confSTFILE	    statistics		Name of the installed statistics file.
confSTRIP	    strip		What program to use for stripping
					executables.
confSTRIPOPTS	    [empty]		Options to pass to the strip program.
confUBINDIR	    /usr/bin		The directory for user-executable
					binaries.
confUBINGRP	    bin			The group for user-executable binaries.
confUBINMODE	    555			The mode for user-executable binaries.
confUBINOWN	    bin			The owner for user-executable binaries.

There are also program specific variables for each of the programs
in the sendmail distribution.  Each has the form `conf_prog_ENVDEF',
for example, `conf_sendmail_ENVDEF'.  If the program name consists
a '.' it must be replaced by '_' first, e.g., use `conf_mail_local_LIBS'
instead of `conf_mail.local_LIBS'.  The variables are:

conf_prog_ENVDEF    [empty]		-D flags passed to C compiler when
					compiling prog.
conf_prog_LIB_POST  [empty]		-l flags passed to ld when linking
					prog (after other libraries).
conf_prog_LIBS	    [varies]		-l flags passed to ld when linking
					prog (before other libraries).
conf_prog_OBJADD    [empty]		Additional object files given to ld
					when linking prog.
conf_prog_SRCADD    [empty]		C source files to compile and link
					for prog.

The order of the different conf*LIBS* is as follows:
conf_prog_LIBS confLIBS conf_prog_LIB_POST

----------------------------------------------------------------

----------------
New build system
----------------

Sendmail's build system has undergone some rearrangement to accommodate
future development.  To the end user building sendmail from a distribution,
this should have little effect.  All the same configuration files and macros
should still behave the same.

If you need to make some radical changes to a Makefile.m4 or are adding new
libraries or utilities, you may want to read the rest of this document on
how to work with the new system.


--------
Overview
--------

The purpose of the redesign is twofold.  First, it cuts down massively on
replicated information.  Second, the new design should lend itself better to
working on platforms with somewhat different build tools than on standard
unix.

The main idea is to have the Makefile.m4 in each subdirectory contain the
minimum amount of information needed to describe the elements needed for
the build process and the products produced.

Each product has a type and each type has a template that provides a basic
makefile for that type.  Right now the templates are organized by the broad
type of the operating system. The two existing types are UNIX and NT.


------------------
Makefile.m4 basics
------------------

Each Makefile.m4 is split into separate products.  For the most part, the
products are considered totally separate from other products in the
Makefile.m4.  Each products is delineated by two macros: bldPRODUCT_START and
bldPRODUCT_END.

The form for bldPRODUCT_START is:
bldPRODUCT_START(<product_type>, <product_name>)
where <product_type> is the type of product to be produced (e.g., executable,
library, manpage) and <product_name> is a unique identifier within the
product_type name space for this Makefile.m4

The form for bldPRODUCT_END is:
bldPRODUCT_END

This is marks the end of all the information for the current product.

There is one other macro required in any Makefile.m4 and that is bldFINISH
which takes no arguments and must appear after all the products have been
defined.

When the actual makefile is generated each product appears in two sections.
The first is where makefile variables are set (e.g., CFLAGS=-O).  The second
is where the targets appear (e.g., foo.o: foo.c).  Anything diverted to
bldTARGETS_SECTION ends up in the second part of the makefile.  Anything
else turns up in the header part where variables are defined.

As always, any straight text put into Makefile.m4 will just show up as is
in the finished makefile.


-------------
Product Types
-------------

executable
----------

This means an executable created from C sources.  The name of the executable
is derived from the product_name in the bldPRODUCT_START macro.

bldSOURCES - This should be defined to a space separated list of source
files that make up the executable.

bldBIN_TYPE - This determines where the binaries will be installed and what
permissions they will have.  Available types are `U', `K', `S', and `E'.
See M4/UNIX/make/executable.m4 for what the different types mean.

bldTARGET_LINKS - This determines where additional symbolic links to the
executable are placed.  These should be full pathnames, separated by
spaces.


manpage
-------

This builds manpages from source using *roff.

bldSOURCES - This should be defined to a space separated list of man source
files.


library
-------

This builds a static library from C sources.

bldSOURCES - This should be defined to a space separated list of C source
files that make up the library.

bldINSTALLABLE - This should be set if the library should be installed in
confLIBDIR.

$Revision: 8.65.4.9 $, Last updated $Date: 2001/05/30 19:50:37 $
