de5663609e
James da Silva. We need to integrate this before 1.1.5 so that we can actually make the boot floppies.
267 lines
8.5 KiB
Groff
267 lines
8.5 KiB
Groff
.\"
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.\" Copyright (c) 1994 University of Maryland
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.\" All Rights Reserved.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and its
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.\" documentation for any purpose is hereby granted without fee, provided that
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.\" the above copyright notice appear in all copies and that both that
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.\" copyright notice and this permission notice appear in supporting
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.\" documentation, and that the name of U.M. not be used in advertising or
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.\" publicity pertaining to distribution of the software without specific,
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.\" written prior permission. U.M. makes no representations about the
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.\" suitability of this software for any purpose. It is provided "as is"
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.\" without express or implied warranty.
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.\"
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.\" U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
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.\" BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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.\" IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" Author: James da Silva, Systems Design and Analysis Group
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.\" Computer Science Department
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.\" University of Maryland at College Park
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.\"
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.Dd June 14, 1994
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.Dt CRUNCHGEN 1
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.Os BSD 4
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.Sh NAME
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.Nm \&crunchgen
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.Nd generates build environment for a crunched binary
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.Sh SYNOPSIS
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.Nm \&crunchgen
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.Op Fl fq
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.Op Fl m Ar makefile-name
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.Op Fl c Ar c-file-name
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.Op Fl e Ar exec-file-name
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.Op Ar conf-file
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.Sh DESCRIPTION
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A crunched binary is a program made up of many other programs linked
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together into a single executable. The crunched binary main()
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function determines which component program to run by the contents of
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argv[0]. The main reason to crunch programs together is for fitting
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as many programs as possible onto an installation or system recovery
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floppy.
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.Pp
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.Nm Crunchgen
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reads in the specifications in
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.Ar conf-file
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for a crunched binary, and generates a Makefile and accompanying
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top-level C source file that when built create the crunched executable
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file from the component programs. For each component program,
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.Nm crunchgen
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can optionally attempt to determine the object (.o) files that make up
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the program from its source directory Makefile. This information is
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cached between runs.
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.Nm Crunchgen
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uses the companion program
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.Nm crunchide
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to eliminate link-time conflicts between the component programs by
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hiding all unnecessary symbols.
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.Pp
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After
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.Nm crunchgen
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is run, the crunched binary can be built by running ``make -f
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<conf-name>.mk''. The component programs' object files must already
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be built. A ``objs'' target, included in the output makefile, will
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run make in each component program's source dir to build the object
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files for the user. This is not done automatically since in release
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engineering circumstances it is generally not desireable to be
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modifying objects in other directories.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl c Ar c-file-name
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Set output C file name to
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.Ar c-file-name .
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The default name is ``<conf-name>.c''.
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.It Fl e Ar exec-file-name
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Set crunched binary executable file name to
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.Ar exec-file-name .
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The default name is ``<conf-name>''.
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.It Fl f
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Flush cache. Forces the recalculation of cached parameters.
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.It Fl m Ar makefile-name
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Set output Makefile name to
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.Ar makefile-name .
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The default name is ``<conf-name>.mk''.
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.It Fl q
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Quiet operation. Status messages are suppressed.
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.El
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.Sh CRUNCHGEN CONFIGURATION FILE COMMANDS
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.Nm Crunchgen
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reads specifications from the
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.Ar conf-file
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that describe the components of the crunched binary. In its simplest
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use, the component program names are merely listed along with the
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top-level source directories in which their sources can be found.
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.Nm Crunchgen
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then calculates (via the source makefiles) and caches the
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list of object files and their locations. For more specialized
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situations, the user can specify by hand all the parameters that
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.Nm crunchgen
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needs.
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.Pp
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The
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.Ar conf-file
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commands are as follows:
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.Bl -tag -width indent
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.It Nm srcdirs Ar dirname ...
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A list of source trees in which the source directories of the
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component programs can be found. These dirs are searched using the
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BSD ``<source-dir>/<progname>/'' convention. Multiple
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.Nm srcdirs
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lines can be specified. The directories are searched in the order
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they are given.
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.It Nm progs Ar progname ...
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A list of programs that make up the crunched binary. Multiple
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.Nm progs
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lines can be specified.
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.It Nm libs Ar libspec ...
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A list of library specifications to be included in the crunched binary link.
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Multiple
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.Nm libs
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lines can be specified.
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.It Nm ln Ar progname linkname
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Causes the crunched binary to invoke
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.Ar progname
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whenever
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.Ar linkname
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appears in argv[0]. This allows programs that change their behavior when
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run under different names to operate correctly.
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.El
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To handle specialized situations, such as when the source is not
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available or not built via a conventional Makefile, the following
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.Nm special
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commands can be used to set
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.Nm crunchgen
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parameters for a component program.
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.Bl -tag -width indent
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.It Nm special Ar progname Nm srcdir Ar pathname
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Set the source directory for
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.Ar progname .
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This is normally calculated by searching the specified
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.Nm srcdirs
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for a directory named
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.Ar progname .
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.It Nm special Ar progname Nm objdir Ar pathname
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Set the obj directory for
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.Ar progname .
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This is normally calculated by looking for a directory named
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.Dq Pa obj
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under the
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.Ar srcdir ,
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and if that is not found, the
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.Ar srcdir
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itself becomes the
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.Ar objdir .
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.It Nm special Ar progname Nm objs Ar object-file-name ...
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Set the list of object files for program
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.Ar progname .
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This is normally calculated by constructing a temporary makefile that includes
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.Dq Nm srcdir / Pa Makefile
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and outputs the value of $(OBJS).
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.It Nm special Ar progname Nm objpaths Ar full-pathname-to-object-file ...
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Sets the pathnames of the object files for program
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.Ar progname .
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This is normally calculated by prepending the
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.Nm objdir
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pathname to each file in the
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.Nm objs
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list.
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.El
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.Pp
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Only the
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.Nm objpaths
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parameter is actually needed by
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.Nm crunchgen ,
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but it is calculated from
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.Nm objdir
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and
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.Nm objs ,
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which are in turn calculated from
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.Nm srcdir ,
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so is sometimes convenient to specify the earlier parameters and let
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.Nm crunchgen
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calculate forward from there if it can.
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.Pp
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The makefile produced by
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.Nm crunchgen
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contains an optional
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.Ar objs
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target that will build the object files for each component program by
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running make inside that program's source directory. For this to work the
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.Nm srcdir
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and
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.Nm objs
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parameters must also be valid. If they are not valid for a particular program, that
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program is skipped in the
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.Ar objs
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target.
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.Sh EXAMPLE
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Here is an example
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.Nm crunchgen
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input conf file, named
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.Dq Pa kcopy.conf :
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.Pp
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.nf
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srcdirs /usr/src/bin /usr/src/sbin
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progs test cp echo sh fsck halt init mount umount myinstall
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ln test [ # test can be invoked via [
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ln sh -sh # init invokes the shell with "-sh" in argv[0]
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special myprog objpaths /homes/leroy/src/myinstall.o # no sources
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libs -lutil -lcrypt
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.fi
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.Pp
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This conf file specifies a small crunched binary consisting of some
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basic system utilities plus a homegrown install program ``myinstall'',
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for which no source directory is specified, but its object file is
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specified directly with the
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.Nm special
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line.
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.Pp
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The crunched binary ``kcopy'' can be built as follows:
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.Pp
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.nf
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% crunchgen -m Makefile kcopy.conf # gen Makefile and kcopy.c
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% make objs # build the component progams' .o files
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% make # build the crunched binary kcopy
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% kcopy sh # test that this invokes a sh shell
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$ # it works!
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.fi
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.Pp
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At this point the binary ``kcopy'' can be copied onto an install floppy
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and hard-linked to the names of the component programs.
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.Sh SEE ALSO
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.Xr crunchide 1
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.Sh CAVEATS
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While
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.Nm crunch
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takes care to eliminate link conflicts between the component programs
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of a crunched binary, conflicts are still possible between the
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libraries that are linked in. Some shuffling in the order of
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libraries may be required, and in some rare cases two libraries may
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have an unresolveable conflict and thus cannot be crunched together.
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.Pp
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Some versions of the BSD build environment do not by default build the
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intermediate object file for single-source file programs. The ``make
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objs'' target must then be used to get those object files built, or
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some other arrangements made.
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.Sh AUTHOR
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.Nm Crunch
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was written by James da Silva <jds@cs.umd.edu>.
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.sp 0
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Copyright (c) 1994 University of Maryland. All Rights Reserved.
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