gecko-dev/security/nss/coreconf

OVERVIEW of "ns/coreconf":

    This README file is an attempt to provide the reader with a simple
    synopsis of the "ns/coreconf" build system which was originally
    fundamentally designed and built to accomodate Netscape's binary
    release model.  Wherever possible, an attempt has been made to
    comply with the NSPR 2.0 build system, including mimicing the
    compiler/linker flags, and directory naming structure.  The reader
    should keep in mind that the system builds binary releases of
    header files, class files, libraries, and executables on numerous
    flavors of UNIX and Windows operating systems.  Unfortunately,
    no serious attempt has ever been made to incorporate an ability to
    generate cross-platform binaries on an Apple MacIntosh platform.

    Note that this file will not attempt to redefine or document the
    architecture of this system.  However, documents on this subject
    are available at the following URL:

        http://warp/hardcore/prj-ttools/specs/release/index.html



DEPENDENCIES of "ns/coreconf":

    The "ns/coreconf" build system requires the specified versions of
    the following platform-dependent tools:

        UNIX Platforms:
        --------------
        gmake (version 3.74 or later)
        perl 4.0 (NOTE:  perl 5.003 or later recommended)
        uname

        Windows Platforms:
        -----------------
        gmake 3.74 (must use hacked Netscape version)
        shmsdos.exe (contained in Netscape gmake.exe)
        nsinstall.exe (contained in Netscape gmake.exe)
        perl.exe (version 4.0 for everything except testing;
                  NOTE:  MKS toolkit perl 5.002 is broken)
        perl5.exe (for testing;
                   NOTE:  perl 5.003 or later recommended;
                          MKS toolkit perl 5.002 is broken)
        uname.exe (use nstools version)

ENHANCEMENTS to "ns/coreconf":

    With the advent of Certificate Server 4.0 using the ns/coreconf
    build system, several changes had to be made to enhance
    ns/coreconf support for building Java/JNI classes/programs, as
    well as libraries slated to be released as binaries.  While the
    following may not represent an exhaustive list of these changes,
    it does attempt to be at least somewhat comprehensive:

        (1) During the course of these enhancements, a total of
            four files have been modified, and four new files have
            been added.

            The following files have been modified:

                - command.mk:    removed old definition of JAR

                - config.mk:     added include statement of new
                                 "jdk.mk" file

                - ruleset.mk:    allowed the $(MKPROG) variable to be
                                 overridden by supplying it with a
                                 default value of $(CC); augmented
                                 numerous definitions to enhance
                                 ability of ns/coreconf to produce
                                 a more robust set of libraries;
                                 added some JNI definitions; PACKAGE
                                 definition may be overridden by new
                                 "jdk.mk" file

                - rules.mk:      separated the compile phase of a
                                 program from the link phase of a
                                 program such that a developer can
                                 now strictly override program linkage
                                 by simply supplying a $(MKPROG)
                                 variable; augmented NETLIBDEPTH
                                 to use CORE_DEPTH but retain backward
                                 compatibility; added JNI section;
                                 modified .PRECIOUS rule;

            The following files have been added:

                - README:        this file; an ASCII-based text
                                 document used to summarize the
                                 ns/coreconf build system and
                                 suitable (paginated) for printing

                - jdk.mk:        a file comprising most (if not all)
                                 of the default Java related build
                                 information; the definitions in this
                                 file are only included if NS_USE_JDK
                                 has been defined

                - jniregen.pl:   a perl script used to create a
                                 dependency for when JNI files should
                                 be regenerated (based upon any change
                                 to the ".class" file from which the
                                 ".h" file was originally generated)

                - outofdate.pl:  a perl script used to create a
                                 dependency for when ".class" files
                                 should be regenerated (based upon
                                 any change to the ".java" file
                                 from which the ".class" file was
                                 originally generated)

        (2) As stated above, the ns/coreconf build system now separates
            the link phase of a program from its compilation phase.
            While ns/coreconf still works exactly as it used to because
            the $(MKPROG) variable is assigned $(CC) by default, a developer
            may now override this behavior by simply supplying their
            own unique value for $(MKPROG) on every platform.  This allows
            a program compiled with $(CC) to link with external libraries
            that may contain "C++" linkage.  Before this change, a
            programmer would need to reference their own local copy of
            rules.mk (see the ns/sectools/cmd/pk12util program for
            an example of how this used to be accomplished).

        (3) Currently, the ns/coreconf build system differs from the
            NSPR 2.0 build system which utilizes an "_s" to denote
            static libraries from import libraries.  In fact, the
            ns/coreconf build system adds no prefixes or suffixes to
            distinguish one version of static libraries from another.
            Note that both the ns/coreconf build system as well as the
            NSPR 2.0 build system do nothing to provide a method of
            distinguishing 16-bit from 32-bit static libraries on the
            same machine, either, since:

                a) this might only provide difficulty during
                   development, since static libraries always
                   need to be embedded within a program
                   (note this is highly unlikely, since libraries
                    for different platforms are subdivided via
                    a well-known subdirectory structure, and
                    a developer may use multiple trees for
                    development),

                b) this maintains backwards compatibility,
                   something very important since no legacy
                   programs will need to change their link phase, and

                c) Netscape as a company has dropped any plans
                   of future development of 16-bit products.

        (4) Since several members of the Hardcore Security group did
            not favor NSPR 2.0's solution of adding an "_s" to static
            libraries on Windows platforms as a method to distinguish
            them from their import library cousins, a different solution
            was proposed and has been recently implemented for ns/coreconf:

                - a 16 has been added as a suffix to both dynamic and
                  import libraries built on 16-bit Windows platforms

                - a 32 has been added as a suffix to both dynamic and
                  import libraries built on 32-bit Windows platforms

            Since the HCL release process currently only contains a
            single instance of building a dynamic library,
            ns/security/lib/fortcrypt/fort12.dll, the impact of this
            change should be relatively small.  (Note: HCL was the
            old name of NSS.)

            It should be noted that although this would additionally
            limit the 8.3 namespace on 16-bit platforms, it is highly
            unlikely that any future development will be performed on
            this platform.

        (5) The $(LIBRARY_VERSION) tag has been added to all non-static
            libraries created on UNIX operating systems to alleviate
            any future confusion for binary releases which utilize this
            tag.  Again, it should be noted that this tag is only
            utilized on non-static libraries, since more than one
            version of the library may need to exist simultaneously
            if multiple products are utilized.

            Currently, only one HCL released library utilizes this tag:

                ns/security/lib/fortcrypt/fort12.a
                (e. g. - in this library, the tag has been set to '12')

            Again, it should be noted that although this would
            additionally limit the 8.3 namespace on 16-bit platforms,
            it is highly unlikely that any future development will be
            performed on this platform.

        (6) The $(JDK_DEBUG_SUFFIX) extension has been added to all
            library and program names to support debug versions of
            Java programs (e. g. - java_g, javac_g, etc).

            Once again, it should be noted that although this would
            additionally limit the 8.3 namespace on 16-bit platforms,
            it is highly unlikely that any future Java development
            will be performed on this platform.

        (7) Most (if not all) default definitions for java have been
            encapsulated within their own file, jdk.mk, which is
            always included by default in ns/coreconf/config.mk.
            However, the definitions within this file are only ever
            activated if NS_USE_JDK has been set to be 1.


        (8) Two perl scripts (jniregen.pl and outofdate.pl) have been
            added to the system to foster a more robust development
            environment for composing Java and JNI programs
            utilizing the ns/coreconf build system.  Both of these
            perl scripts are related to resolving dependencies which
            can not be accomplished through normal makefile dependencies.

        (9) This file, README, was created in an attempt to allow
            developers who have familiarity with ns/coreconf a simple
            roadmap for what has changed, as well as a top-level view of
            what comprises ns/coreconf.  This file was written in
            ASCII (rather than HTML) primarily to promote simple
            paginated printing.

OVERVIEW of "config.mk":

    This file contains the configuration information necessary to
    build each "Core Components" source module:

        include file name       Purpose
        ===================     =======================================
        arch.mk                 source and release <architecture> tags

        command.mk              default command macros 
				(NOTE: may be overridden in $(OS_CONFIG).mk)

        $(OS_CONFIG).mk         <architecture>-specific macros
                                (dependent upon <architecture> tags)

        tree.mk                 release <tree> tags 
				(dependent upon <architecture> tags)

        module.mk               source and release <component> tags 
				(NOTE:  A component is also called a module 
				or a subsystem.  This file is dependent upon
                                $(MODULE) being defined on the command
                                line, as an environment variable, or in
                                individual makefiles, or more
                                appropriately, manifest.mn)

        version.mk              release <version> tags 
				(dependent upon $(MODULE) being defined on 
				the command line, as an environment variable, 
				or in individual makefiles, or more
                                appropriately, manifest.mn)

        location.mk             macros to figure out binary code location
                                (dependent upon <platform> tags)

        source.mk               <component>-specific source path
                                (dependent upon <user_source_tree>,
                                <source_component>, <version>, and
                                <platform> tags)

        headers.mk              include switch for support header files 
				(dependent upon <tree>, <component>, <version>,
                                and <platform> tags)

        prefix.mk               compute program prefixes

        suffix.mk               compute program suffixes 
				(dependent upon <architecture> tags)

        jdk.mk                  define JDK 
				(dependent upon <architecture>,
                                <source>, and <suffix> tags)

        ruleset.mk              Master "Core Components" rule set
                                (should always be the last file
                                included by config.mk)



OVERVIEW of "rules.mk":

    The "rules.mk" file consists of four sections.  The first section
    contains the "master" build rules for all binary releases.  While
    this section can (and should) largely be thought of as "language"
    independent, it does utilize the "perl" scripting language to
    perform both the "import" and "release" of binary modules.

    The rules which dwell in this section and their purpose:


        CATEGORY/rule::         Purpose
        ===================     =======================================

        GENERAL
        -------
        all::                   "default" all-encompassing rule which
                                performs "export libs program install"

        export::                recursively copy specified
                                cross-platform header files to the
                                $(SOURCE_XPHEADERS_DIR) directory;
                                recursively copy specified
                                machine-dependent header files to the
                                $(SOURCE_MDHEADERS_DIR) directory;
                                although all rules can be written to
                                repetively "chain" into other sections,
                                this rule is the most commonly used
                                rule to "chain" into other sections
                                such as Java providing a simple
                                mechanism which allows no need for
                                developers to memorize specialized
                                rules

        libs::                  recursively build
                                static (archival) $(LIBRARY), shared
                                (dynamic link) $(SHARED_LIBRARY),
                                and/or import $(IMPORT_LIBRARY)
                                libraries

        program::               recursively build $(PROGRAM)
                                executable

        install::               recursively copy all libraries to
                                $(SOURCE_LIB_DIR) directory;
                                recursively copy all executables to
                                $(SOURCE_BIN_DIR) directory

        clean::                 remove all files specified in the
                                $(ALL_TRASH) variable

        clobber::               synonym for "clean::" rule

        realclean::             remove all files specified by
                                $(wildcard *.OBJ), dist, and in
                                the $(ALL_TRASH) variable

        clobber_all::           synonym for "realclean::" rule


        RELEASE
        -------
        release_clean::         remove all files from the
                                $(SOURCE_RELEASE_PREFIX) directory

        release::               place specified VERSION of the
                                binary release in the appropriate
                                $(RELEASE_TREE) directory

        release_export::        recursively copy specified
                                cross-platform header files to the
                                $(SOURCE_XPHEADERS_DIR)/include
                                directory

        release_md::            recursively copy all libraries to
                                $(SOURCE_RELEASE_PREFIX)/
                                $(SOURCE_RELEASE_LIB_DIR) directory;
                                recursively copy all executables to
                                $(SOURCE_RELEASE_PREFIX)/
                                $(SOURCE_RELEASE_BIN_DIR) directory


        TOOLS and AUTOMATION
        --------------------
        platform::              tool used to display the platform name
                                as composed within the "arch.mk" file

        autobuild::             automation rule used by "Bonsai" and
                                "Tinderbox" to automatically generate
                                binary releases on various platforms

        check::                 automation tool used to run the
                                "regress" and "reporter" tools 
                                on various regression test suites

    The second section of "rules.mk" primarily contains several
    "language" dependent build rules for binary releases.  These are
    generally "computed" rules (created on the "fly"), and include
    rules used by "C", "C++", assembly, the preprocessor, perl, and
    the shell.

    The rules which dwell in this section and their purpose:


        CATEGORY/rule::                   Purpose
        ===================               =============================

        LIBRARIES
        ---------
        $(LIBRARY):                       build the static library
                                          specified by the $(LIBRARY)
                                          variable

        $(IMPORT_LIBRARY):                build the import library
                                          specified by the
                                          $(IMPORT_LIBRARY) variable

        $(SHARED_LIBRARY):                build the shared
                                          (dynamic link) library
                                          specified by the
                                          $(SHARED_LIBRARY) variable


        PROGRAMS
        --------
        $(PROGRAM):                       build the binary executable
                                          specified by the $(PROGRAM)
                                          rule

        $(OBJDIR)/
        $(PROG_PREFIX)%.pure:             build the "purified" binary
                                          executable specified by this
                                          rule


        OBJECTS
        -------
        $(OBJDIR)/
        $(PROG_PREFIX)%$(OBJ_SUFFIX):     build the object file
                                          associated with the
                                          makefile rule dependency:

                                              %.c   = C file
                                              %.cpp = C++ file
                                              %.cc  = C++ file
                                              %.s   = assembly file
                                              %.S   = assembly file

        $(OBJDIR)/
        $(PROG_PREFIX)%:                  (NOTE: deprecated rule)
                                          build the object file
                                          associated with the
                                          makefile rule dependency:

                                              %.cpp = C++ file

        MISCELLANEOUS
        -------------
        %.i:                              build the preprocessor file
                                          associated with the
                                          makefile rule dependency:

                                              %.c   = C file
                                              %.cpp = C++ file

        %:                                process the specified file
                                          using the method associated
                                          with the makefile rule
                                          dependency:

                                              %.pl = perl script
                                              %.sh = shell script

        alltags:                          tool used to recursively
                                          create a "ctags"-style
                                          file for reference

    The third section of "rules.mk' primarily contains several JAVA
    "language" build rules for binary releases.  These are also
    generally "computed" rules (created on the "fly").

    The rules which dwell in this section and their purpose:


        CATEGORY/rule::                   Purpose
        ===================               =============================
        $(JAVA_DESTPATH)::                create directory specified
                                          as the Java destination path
                                          for where classes are
                                          deposited

        $(JAVA_DESTPATH)/$(PACKAGE)::     create directories specified
                                          within the $(PACKAGE)
                                          variable

        $(JMCSRCDIR)::                    create directory specified
                                          as the JMC destination path

        $(JRI_HEADER_CFILES):             used to generate/regenerate
                                          JRI header files for "C"

        $(JRI_STUB_CFILES):               used to generate/regenerate
                                          JRI stub files for "C"

        $(JNI_HEADERS):                   used to generate/regenerate
                                          JNI header files for "C"

    The fourth section of "rules.mk" primarily contains miscellaneous
    build rules for binary releases.  Many of these rules are here to
    create new subdirectories, manage dependencies, and/or override
    standard gmake "Makefile" rules.

    The rules which dwell in this section and their purpose:


        CATEGORY/rule::                   Purpose
        ===================               =============================

        $(SOURCE_XP_DIR)/
        release/include::                 create directory used to
                                          house "C" header files
                                          contained in a release

        .DEFAULT:                         standard gmake rule

        .SUFFIXES:                        standard gmake rule

        .PRECIOUS:                        standard gmake rule

        .PHONY:                           standard gmake rule