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## Generating buiild dependencies automatically

As we start updating packages for the next Red Hat distro, I'd like to see packages start to make use of build dependencies. Basically build dependencies are just like install dependencies, but they are resolved against the build system just after parsing the spec file. Syntactically, build dependencies look just like install dependencies in a spec file with "Build" prefixed:

            BuildPrereqs:
            BuildRequires:
            BuildConflicts:

All the above dependencies include versions, files, existence/range tests, etc. The build dependency checking can also be turned off with --nodeps if necessary just like install dependency checking can. Eventually, build dependencies will be automated in rpm, but the major impediment to that effort is the engineering required to maintain the pretense that src rpm's are "noarch".

Meanwhile, I've added a package called "InDependence-1.0" to powertools-6.2 that may be of use in detecting build dependencies that can be added to spec files as part of rebuilding packages for Red Hat 6.2.

Here's a short example of how to generate the package/file names that were used while building gnorpm using InDependence:

            rpm -U /mnt/redhat/comps/powertools/6.2/i386/InDependence-1.0-3.i386.rpm
            rpm -i /mnt/redhat/comps/dist/6.2/SRPMS/gnorpm-0.9-11.src.rpm
            cd /usr/src/redhat/SPECS
            dep -detail rpm -ba gnorpm.spec >& xxx
            ...
            (the build will take longer since both dep and strace are pigs)
            ...
            grep -- '::' xxx > yyy

    Aside:  The dep perl wrapper is a "pig" only because it's exec'ing
                    rpm -qf <filename>
            in order to turn filenames into package names. There are easier/faster
            ways to get this information...

            There's no way to speed up the
                    /sbin/strace -q -etrace=open,execve -o ...
            command itself. The eventual implementation in rpm will snatch the
            same open/execve syscalls using LD_PRELOAD.

            Patches cheerfully accepted :-)

Here's what's in yyy (<packagename>::<filename> format):

            ORBit-devel-0.4.95-2::/usr/bin/orbit-config
            XFree86-libs-3.3.5-6::/usr/X11R6/lib/libICE.so.6
            XFree86-libs-3.3.5-6::/usr/X11R6/lib/libSM.so.6
            XFree86-libs-3.3.5-6::/usr/X11R6/lib/libX11.so.6
            XFree86-libs-3.3.5-6::/usr/X11R6/lib/libXext.so.6
            audiofile-0.1.9-1::/usr/lib/libaudiofile.so.0
            autoconf-2.13-5::/usr/bin/autoconf
            autoconf-2.13-5::/usr/bin/autoheader
            autoconf-2.13-5::/usr/share/autoconf/acgeneral.m4
            autoconf-2.13-5::/usr/share/autoconf/autoconf.m4f
            automake-1.4-5::/usr/bin/aclocal
            automake-1.4-5::/usr/bin/automake
            bash-1.14.7-16::/bin/sh
            bash-1.14.7-16::/etc/bashrc
            binutils-2.9.1.0.23-7::/usr/bin/strip
            binutils-2.9.1.0.23-7::/usr/lib/libbfd-2.9.1.0.24.so
            binutils-2.9.1.0.23-7::/usr/lib/libopcodes-2.9.1.0.24.so
            bzip2-0.9.5c-1::/usr/lib/libbz2.so.0
            dev-2.7.10-2::/dev/null
            diffutils-2.7-16::/usr/bin/cmp
            egcs-1.1.2-25::/usr/bin/gcc
            egcs-1.1.2-25::/usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
            esound-0.2.14-1::/usr/lib/libesd.so.0
            file-3.27-3::/usr/bin/file
            file-3.27-3::/usr/share/magic
            fileutils-4.0-8::/bin/chgrp
            fileutils-4.0-8::/bin/chmod
            fileutils-4.0-8::/bin/chown
            fileutils-4.0-8::/bin/cp
            fileutils-4.0-8::/bin/ln
            fileutils-4.0-8::/bin/ls
            fileutils-4.0-8::/bin/mkdir
            fileutils-4.0-8::/bin/mv
            fileutils-4.0-8::/bin/rm
            fileutils-4.0-8::/usr/bin/install
            findutils-4.1-32::/usr/bin/xargs
            gawk-3.0.4-1::/bin/awk
            gawk-3.0.4-1::/bin/gawk
            gettext-0.10.35-13::/usr/bin/xgettext
            glib-1.2.5-1::/usr/lib/libglib-1.2.so.0
            glib-1.2.5-1::/usr/lib/libgmodule-1.2.so.0
            glib-devel-1.2.5-1::/usr/bin/glib-config
            glibc-2.1.2-13::/etc/localtime
            glibc-2.1.2-13::/etc/nsswitch.conf
            glibc-2.1.2-13::/lib/ld-linux.so.2
            glibc-2.1.2-13::/lib/libc.so.6
            glibc-2.1.2-13::/lib/libcrypt.so.1
            glibc-2.1.2-13::/lib/libdb.so.2
            glibc-2.1.2-13::/lib/libdl.so.2
            glibc-2.1.2-13::/lib/libm.so.6
            glibc-2.1.2-13::/lib/libnsl.so.1
            glibc-2.1.2-13::/lib/libnss_dns.so.2
            glibc-2.1.2-13::/lib/libnss_files.so.2
            glibc-2.1.2-13::/lib/libnss_nis.so.2
            glibc-2.1.2-13::/lib/libnss_nisplus.so.2
            glibc-2.1.2-13::/lib/libresolv.so.2
            glibc-2.1.2-13::/usr/bin/ldd
            gnome-libs-1.0.54-1::/usr/lib/libart_lgpl.so.2
            gnome-libs-1.0.54-1::/usr/lib/libgnome.so.32
            gnome-libs-1.0.54-1::/usr/lib/libgnomesupport.so.0
            gnome-libs-1.0.54-1::/usr/lib/libgnomeui.so.32
            gnome-libs-devel-1.0.54-1::/usr/bin/gnome-config
            grep-2.3-2::/bin/egrep
            grep-2.3-2::/bin/fgrep
            grep-2.3-2::/bin/grep
            gtk+-1.2.5-2::/usr/lib/libgdk-1.2.so.0
            gtk+-1.2.5-2::/usr/lib/libgtk-1.2.so.0
            imlib-1.9.7-1::/usr/lib/libgdk_imlib.so.1
            libghttp-1.0.4-1::/usr/lib/libghttp.so.1
            libtool-1.3.3-1::/usr/bin/libtoolize
            libtool-1.3.3-1::/usr/share/libtool/config.guess
            libtool-1.3.3-1::/usr/share/libtool/config.sub
            libtool-1.3.3-1::/usr/share/libtool/ltconfig
            libtool-1.3.3-1::/usr/share/libtool/ltmain.sh
            libxml-1.4.0-1::/usr/lib/libxml.so.1
            libxml-devel-1.4.0-1::/usr/bin/xml-config
            m4-1.4-12::/usr/bin/m4
            make-3.77-6::/usr/bin/make
            mktemp-1.5-1::/bin/mktemp
            net-tools-1.53-1::/bin/hostname
            patch-2.5-9::/usr/bin/patch
            rootfiles-5.2-5::/root/.bashrc
            rpm-3.0.4-0.16::/bin/rpm
            rpm-3.0.4-0.16::/usr/lib/librpm.so.0
            rpm-3.0.4-0.16::/usr/lib/rpm/find-provides
            rpm-3.0.4-0.16::/usr/lib/rpm/find-requires
            rpm-3.0.4-0.16::/usr/lib/rpm/macros
            rpm-3.0.4-0.16::/usr/lib/rpm/rpmpopt
            rpm-3.0.4-0.16::/usr/lib/rpm/rpmrc
            sed-3.02-4::/bin/sed
            setup-2.0.5-1::/etc/group
            setup-2.0.5-1::/etc/host.conf
            setup-2.0.5-1::/etc/passwd
            sh-utils-2.0-1::/bin/basename
            sh-utils-2.0-1::/bin/false
            sh-utils-2.0-1::/bin/sleep
            sh-utils-2.0-1::/bin/true
            sh-utils-2.0-1::/usr/bin/expr
            sh-utils-2.0-1::/usr/bin/id
            texinfo-3.12h-2::/usr/bin/makeinfo
            textutils-2.0-2::/bin/cat
            textutils-2.0-2::/bin/sort
            textutils-2.0-2::/usr/bin/cut
            textutils-2.0-2::/usr/bin/tr
            zlib-1.1.3-5::/usr/lib/libz.so.1

The information can be used to generate build prerequisites. What is still needed is a sensible approach on

            1) eliminating obvious common dependencies (e.g. libtool, egcs).
            2) identifying (and removing for now) per-platform build dependencies.
            3) deciding on whether to add the build dependency on a file or on the
            package that contains the file.
            4) if adding a dependency on a package, choosing version ranges as
            appropriate.

but that's up to individual packagers.