d0ac1c4488
When trying to run the update-gnulib.sh script in gdb, I get this: Error: Wrong automake version (Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/\${ <-- HERE ([^ =:+{}]+)}/ at /opt/automake/1.11.1/bin/automake line 4113.), we need 1.11.1. Aborting. Apparently, it's an issue with a regex in automake that triggers a warning starting with Perl 5.22. It has been fixed in automake 1.15.1. So I think it's a good excuse to bump the versions of autoconf and automake used in the gnulib import. And to avoid requiring multiple builds of autoconf/automake, it was suggested that we bump the required version of those tools for all binutils-gdb. For autoconf, the 2.69 version is universally available, so it's an easy choice. For automake, different distros and distro versions have different automake versions. But 1.15.1 seems to be the most readily available as a package. In any case, it's easy to build it from source. I removed the version checks from AUTOMAKE_OPTIONS and AC_PREREQ, because I don't think they are useful in our case. They only specify a lower bound for the acceptable version of automake/autoconf. That's useful if you let the user choose the version of the tool they want to use, but want to set a minimum version (because you use a feature that was introduced in that version). In our case, we force people to use a specific version anyway. For the autoconf version, we have the check in config/override.m4 that enforces the version we want. It will be one less thing to update next time we change autotools version. I hit a few categories of problems that required some changes. They are described below along with the chosen solutions. Problem 1: configure.ac:17: warning: AM_INIT_AUTOMAKE: two- and three-arguments forms are deprecated. For more info, see: configure.ac:17: http://www.gnu.org/software/automake/manual/automake.html#Modernize-AM_005fINIT_005fAUTOMAKE-invocation Solution 1: Adjust the code based on the example at that URL. Problem 2 (in zlib/): Makefile.am: error: required file './INSTALL' not found Makefile.am: 'automake --add-missing' can install 'INSTALL' Makefile.am: error: required file './NEWS' not found Makefile.am: error: required file './AUTHORS' not found Makefile.am: error: required file './COPYING' not found Makefile.am: 'automake --add-missing' can install 'COPYING' Solution 2: Add the foreign option to AUTOMAKE_OPTIONS. Problem 3: doc/Makefile.am:20: error: support for Cygnus-style trees has been removed Solution 3: Remove the cygnus options. Problem 4: Makefile.am:656: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS') Solution 4: Rename "INCLUDES = " to "AM_CPPFLAGS += " (because AM_CPPFLAGS is already defined earlier). Problem 5: doc/Makefile.am:71: warning: suffix '.texinfo' for Texinfo files is discouraged; use '.texi' instead doc/Makefile.am: warning: Oops! doc/Makefile.am: It appears this file (or files included by it) are triggering doc/Makefile.am: an undocumented, soon-to-be-removed automake hack. doc/Makefile.am: Future automake versions will no longer place in the builddir doc/Makefile.am: (rather than in the srcdir) the generated '.info' files that doc/Makefile.am: appear to be cleaned, by e.g. being listed in CLEANFILES or doc/Makefile.am: DISTCLEANFILES. doc/Makefile.am: If you want your '.info' files to be placed in the builddir doc/Makefile.am: rather than in the srcdir, you have to use the shiny new doc/Makefile.am: 'info-in-builddir' automake option. Solution 5: Rename .texinfo files to .texi. Problem 6: doc/Makefile.am: warning: Oops! doc/Makefile.am: It appears this file (or files included by it) are triggering doc/Makefile.am: an undocumented, soon-to-be-removed automake hack. doc/Makefile.am: Future automake versions will no longer place in the builddir doc/Makefile.am: (rather than in the srcdir) the generated '.info' files that doc/Makefile.am: appear to be cleaned, by e.g. being listed in CLEANFILES or doc/Makefile.am: DISTCLEANFILES. doc/Makefile.am: If you want your '.info' files to be placed in the builddir doc/Makefile.am: rather than in the srcdir, you have to use the shiny new doc/Makefile.am: 'info-in-builddir' automake option. Solution 6: Remove the hack at the bottom of doc/Makefile.am and use the info-in-builddir automake option. Problem 7: doc/Makefile.am:35: error: required file '../texinfo.tex' not found doc/Makefile.am:35: 'automake --add-missing' can install 'texinfo.tex' Solution 7: Use the no-texinfo.tex automake option. We also have one in texinfo/texinfo.tex, not sure if we should point to that, or move it (or a newer version of it added with automake --add-missing) to top-level. Problem 8: Makefile.am:131: warning: source file 'config/tc-aarch64.c' is in a subdirectory, Makefile.am:131: but option 'subdir-objects' is disabled automake: warning: possible forward-incompatibility. automake: At least a source file is in a subdirectory, but the 'subdir-objects' automake: automake option hasn't been enabled. For now, the corresponding output automake: object file(s) will be placed in the top-level directory. However, automake: this behaviour will change in future Automake versions: they will automake: unconditionally cause object files to be placed in the same subdirectory automake: of the corresponding sources. automake: You are advised to start using 'subdir-objects' option throughout your automake: project, to avoid future incompatibilities. Solution 8: Use subdir-objects, that means adjusting references to some .o that will now be in config/. Problem 9: configure.ac:375: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from... ../../lib/autoconf/general.m4:2601: _AC_COMPILE_IFELSE is expanded from... ../../lib/autoconf/general.m4:2617: AC_COMPILE_IFELSE is expanded from... ../../lib/m4sugar/m4sh.m4:639: AS_IF is expanded from... ../../lib/autoconf/general.m4:2042: AC_CACHE_VAL is expanded from... ../../lib/autoconf/general.m4:2063: AC_CACHE_CHECK is expanded from... configure.ac:375: the top level Solution 9: Use AC_LANG_SOURCE, or use proper quoting. Problem 10 (in intl/): configure.ac:7: warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS /usr/share/aclocal/threadlib.m4:36: gl_THREADLIB_EARLY_BODY is expanded from... /usr/share/aclocal/threadlib.m4:29: gl_THREADLIB_EARLY is expanded from... /usr/share/aclocal/threadlib.m4:318: gl_THREADLIB is expanded from... /usr/share/aclocal/lock.m4:9: gl_LOCK is expanded from... /usr/share/aclocal/intl.m4:211: gt_INTL_SUBDIR_CORE is expanded from... /usr/share/aclocal/intl.m4:25: AM_INTL_SUBDIR is expanded from... /usr/share/aclocal/gettext.m4:57: AM_GNU_GETTEXT is expanded from... configure.ac:7: the top level Solution 10: Add AC_USE_SYSTEM_EXTENSIONS in configure.ac. ChangeLog: * libtool.m4: Use AC_LANG_SOURCE. * configure.ac: Remove AC_PREREQ, use AC_LANG_SOURCE. * README-maintainer-mode: Update version requirements. * ar-lib: New file. * test-driver: New file. * configure: Re-generate. bfd/ChangeLog: * Makefile.am (AUTOMAKE_OPTIONS): Remove 1.11. (INCLUDES): Rename to ... (AM_CPPFLAGS): ... this. * configure.ac: Remove AC_PREREQ. * doc/Makefile.am (AUTOMAKE_OPTIONS): Remove 1.9, cygnus, add info-in-builddir no-texinfo.tex. (info_TEXINFOS): Rename bfd.texinfo to bfd.texi. * doc/bfd.texinfo: Rename to ... * doc/bfd.texi: ... this. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * config.in: Re-generate. * configure: Re-generate. * doc/Makefile.in: Re-generate. binutils/ChangeLog: * configure.ac: Remove AC_PREREQ. * doc/Makefile.am (AUTOMAKE_OPTIONS): Remove cygnus, add info-in-builddir no-texinfo.tex. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * config.in: Re-generate. * configure: Re-generate. * doc/Makefile.in: Re-generate. config/ChangeLog: * override.m4 (_GCC_AUTOCONF_VERSION): Bump from 2.64 to 2.69. etc/ChangeLog: * configure.in: Remove AC_PREREQ. * configure: Re-generate. gas/ChangeLog: * Makefile.am (AUTOMAKE_OPTIONS): Remove 1.11, add subdir-objects. (TARG_CPU_O, OBJ_FORMAT_O, ATOF_TARG_O): Add config/ prefix. * configure.ac (TARG_CPU_O, OBJ_FORMAT_O, ATOF_TARG_O, emfiles, extra_objects): Add config/ prefix. * doc/as.texinfo: Rename to... * doc/as.texi: ... this. * doc/Makefile.am: Rename as.texinfo to as.texi throughout. Remove DISTCLEANFILES hack. (AUTOMAKE_OPTIONS): Remove 1.8, cygnus, add no-texinfo.tex and info-in-builddir. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * config.in: Re-generate. * configure: Re-generate. * doc/Makefile.in: Re-generate. gdb/ChangeLog: * common/common-defs.h (PACKAGE_NAME, PACKAGE_VERSION, PACKAGE_STRING, PACKAGE_TARNAME): Undefine. * configure.ac: Remove AC_PREREQ, add missing quoting. * gnulib/configure.ac: Modernize usage of AC_INIT/AM_INIT_AUTOMAKE. Remove AC_PREREQ. * gnulib/update-gnulib.sh (AUTOCONF_VERSION): Bump to 2.69. (AUTOMAKE_VERSION): Bump to 1.15.1. * configure: Re-generate. * config.in: Re-generate. * aclocal.m4: Re-generate. * gnulib/aclocal.m4: Re-generate. * gnulib/config.in: Re-generate. * gnulib/configure: Re-generate. * gnulib/import/Makefile.in: Re-generate. gdb/gdbserver/ChangeLog: * configure.ac: Remove AC_PREREQ, add missing quoting. * configure: Re-generate. * config.in: Re-generate. * aclocal.m4: Re-generate. gdb/testsuite/ChangeLog: * configure.ac: Remove AC_PREREQ. * configure: Re-generate. gold/ChangeLog: * configure.ac: Remove AC_PREREQ, add missing quoting and usage of AC_LANG_SOURCE. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * configure: Re-generate. * testsuite/Makefile.in: Re-generate. gprof/ChangeLog: * configure.ac: Remove AC_PREREQ. * Makefile.am: Remove DISTCLEANFILES hack. (AUTOMAKE_OPTIONS): Remove 1.11, add info-in-builddir. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * configure: Re-generate. * gconfig.in: Re-generate. intl/ChangeLog: * configure.ac: Add AC_USE_SYSTEM_EXTENSIONS, remove AC_PREREQ. * configure: Re-generate. * config.h.in: Re-generate. * aclocal.m4: Re-generate. ld/ChangeLog: * configure.ac: Remove AC_PREREQ. * Makefile.am: Remove DISTCLEANFILES hack, rename ld.texinfo to ld.texi, ldint.texinfo to ldint.texi throughout. (AUTOMAKE_OPTIONS): Add info-in-builddir. * README: Rename ld.texinfo to ld.texi, ldint.texinfo to ldint.texi throughout. * gen-doc.texi: Likewise. * h8-doc.texi: Likewise. * ld.texinfo: Rename to ... * ld.texi: ... this. * ldint.texinfo: Rename to ... * ldint.texi: ... this. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * config.in: Re-generate. * configure: Re-generate. libdecnumber/ChangeLog: * configure.ac: Remove AC_PREREQ. * configure: Re-generate. * aclocal.m4. libiberty/ChangeLog: * configure.ac: Remove AC_PREREQ. * configure: Re-generate. * config.in: Re-generate. opcodes/ChangeLog: * Makefile.am (AUTOMAKE_OPTIONS): Remove 1.11. * configure.ac: Remove AC_PREREQ. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * configure: Re-generate. readline/ChangeLog.gdb: * configure: Re-generate. * examples/rlfe/configure: Re-generate. sim/ChangeLog: * All configure.ac: Remove AC_PREREQ. * All configure: Re-generate. zlib/ChangeLog.bin-gdb: * configure.ac: Modernize AC_INIT call, remove AC_PREREQ. * Makefile.am (AUTOMAKE_OPTIONS): Remove 1.8, cygnus, add foreign. * Makefile.in: Re-generate. * aclocal.m4: Re-generate. * configure: Re-generate.
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\input texinfo.tex
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@setfilename bfd.info
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@c Copyright (C) 1988-2018 Free Software Foundation, Inc.
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@c
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@synindex fn cp
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@ifnottex
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@dircategory Software development
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@direntry
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* Bfd: (bfd). The Binary File Descriptor library.
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@end direntry
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@end ifnottex
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@copying
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This file documents the BFD library.
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Copyright @copyright{} 1991-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``GNU General Public License'' and ``Funding
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Free Software'', the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled ``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development.
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@end copying
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@iftex
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@c@finalout
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@setchapternewpage on
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@c@setchapternewpage odd
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@settitle LIB BFD, the Binary File Descriptor Library
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@titlepage
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@title{libbfd}
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@subtitle{The Binary File Descriptor Library}
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@sp 1
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@subtitle First Edition---BFD version < 3.0 % Since no product is stable before version 3.0 :-)
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@subtitle Original Document Created: April 1991
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@author {Steve Chamberlain}
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@author {Cygnus Support}
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@page
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@tex
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\def\$#1${{#1}} % Kluge: collect RCS revision info without $...$
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\xdef\manvers{1.5} % For use in headers, footers too
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{\parskip=0pt
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\hfill Free Software Foundation\par
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\hfill sac\@www.gnu.org\par
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\hfill {\it BFD}, \manvers\par
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\hfill \TeX{}info \texinfoversion\par
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}
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\global\parindent=0pt % Steve likes it this way
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@end tex
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@vskip 0pt plus 1filll
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Copyright @copyright{} 1991-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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@end titlepage
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@end iftex
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@contents
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@node Top, Overview, (dir), (dir)
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@ifinfo
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This file documents the binary file descriptor library libbfd.
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@end ifinfo
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@menu
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* Overview:: Overview of BFD
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* BFD front end:: BFD front end
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* BFD back ends:: BFD back ends
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* GNU Free Documentation License:: GNU Free Documentation License
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* BFD Index:: BFD Index
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@end menu
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@node Overview, BFD front end, Top, Top
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@chapter Introduction
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@cindex BFD
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@cindex what is it?
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BFD is a package which allows applications to use the
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same routines to operate on object files whatever the object file
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format. A new object file format can be supported simply by
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creating a new BFD back end and adding it to the library.
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BFD is split into two parts: the front end, and the back ends (one for
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each object file format).
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@itemize @bullet
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@item The front end of BFD provides the interface to the user. It manages
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memory and various canonical data structures. The front end also
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decides which back end to use and when to call back end routines.
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@item The back ends provide BFD its view of the real world. Each back
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end provides a set of calls which the BFD front end can use to maintain
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its canonical form. The back ends also may keep around information for
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their own use, for greater efficiency.
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@end itemize
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@menu
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* History:: History
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* How It Works:: How It Works
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* What BFD Version 2 Can Do:: What BFD Version 2 Can Do
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@end menu
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@node History, How It Works, Overview, Overview
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@section History
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One spur behind BFD was the desire, on the part of the GNU 960 team at
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Intel Oregon, for interoperability of applications on their COFF and
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b.out file formats. Cygnus was providing GNU support for the team, and
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was contracted to provide the required functionality.
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The name came from a conversation David Wallace was having with Richard
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Stallman about the library: RMS said that it would be quite hard---David
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said ``BFD''. Stallman was right, but the name stuck.
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At the same time, Ready Systems wanted much the same thing, but for
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different object file formats: IEEE-695, Oasys, Srecords, a.out and 68k
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coff.
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BFD was first implemented by members of Cygnus Support; Steve
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Chamberlain (@code{sac@@cygnus.com}), John Gilmore
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(@code{gnu@@cygnus.com}), K. Richard Pixley (@code{rich@@cygnus.com})
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and David Henkel-Wallace (@code{gumby@@cygnus.com}).
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@node How It Works, What BFD Version 2 Can Do, History, Overview
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@section How To Use BFD
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To use the library, include @file{bfd.h} and link with @file{libbfd.a}.
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BFD provides a common interface to the parts of an object file
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for a calling application.
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When an application successfully opens a target file (object, archive, or
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whatever), a pointer to an internal structure is returned. This pointer
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points to a structure called @code{bfd}, described in
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@file{bfd.h}. Our convention is to call this pointer a BFD, and
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instances of it within code @code{abfd}. All operations on
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the target object file are applied as methods to the BFD. The mapping is
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defined within @code{bfd.h} in a set of macros, all beginning
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with @samp{bfd_} to reduce namespace pollution.
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For example, this sequence does what you would probably expect:
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return the number of sections in an object file attached to a BFD
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@code{abfd}.
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@example
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@c @cartouche
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#include "bfd.h"
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unsigned int number_of_sections (abfd)
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bfd *abfd;
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@{
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return bfd_count_sections (abfd);
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@}
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@c @end cartouche
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@end example
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The abstraction used within BFD is that an object file has:
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@itemize @bullet
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@item
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a header,
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@item
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a number of sections containing raw data (@pxref{Sections}),
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@item
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a set of relocations (@pxref{Relocations}), and
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@item
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some symbol information (@pxref{Symbols}).
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@end itemize
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@noindent
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Also, BFDs opened for archives have the additional attribute of an index
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and contain subordinate BFDs. This approach is fine for a.out and coff,
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but loses efficiency when applied to formats such as S-records and
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IEEE-695.
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@node What BFD Version 2 Can Do, , How It Works, Overview
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@section What BFD Version 2 Can Do
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@include bfdsumm.texi
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@node BFD front end, BFD back ends, Overview, Top
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@chapter BFD Front End
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@menu
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* typedef bfd::
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* Error reporting::
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* Miscellaneous::
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* Memory Usage::
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* Initialization::
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* Sections::
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* Symbols::
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* Archives::
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* Formats::
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* Relocations::
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* Core Files::
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* Targets::
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* Architectures::
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* Opening and Closing::
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* Internal::
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* File Caching::
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* Linker Functions::
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* Hash Tables::
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@end menu
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@include bfdt.texi
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@include bfdio.texi
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@node Memory Usage, Initialization, Miscellaneous, BFD front end
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@section Memory Usage
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BFD keeps all of its internal structures in obstacks. There is one obstack
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per open BFD file, into which the current state is stored. When a BFD is
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closed, the obstack is deleted, and so everything which has been
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allocated by BFD for the closing file is thrown away.
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BFD does not free anything created by an application, but pointers into
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@code{bfd} structures become invalid on a @code{bfd_close}; for example,
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after a @code{bfd_close} the vector passed to
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@code{bfd_canonicalize_symtab} is still around, since it has been
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allocated by the application, but the data that it pointed to are
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lost.
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The general rule is to not close a BFD until all operations dependent
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upon data from the BFD have been completed, or all the data from within
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the file has been copied. To help with the management of memory, there
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is a function (@code{bfd_alloc_size}) which returns the number of bytes
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in obstacks associated with the supplied BFD. This could be used to
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select the greediest open BFD, close it to reclaim the memory, perform
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some operation and reopen the BFD again, to get a fresh copy of the data
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structures.
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@node Initialization, Sections, Memory Usage, BFD front end
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@include init.texi
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@node Sections, Symbols, Initialization, BFD front end
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@include section.texi
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@node Symbols, Archives, Sections, BFD front end
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@include syms.texi
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@node Archives, Formats, Symbols, BFD front end
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@include archive.texi
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@node Formats, Relocations, Archives, BFD front end
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@include format.texi
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@node Relocations, Core Files, Formats, BFD front end
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@include reloc.texi
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@node Core Files, Targets, Relocations, BFD front end
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@include core.texi
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@node Targets, Architectures, Core Files, BFD front end
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@include targets.texi
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@node Architectures, Opening and Closing, Targets, BFD front end
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@include archures.texi
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@node Opening and Closing, Internal, Architectures, BFD front end
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@include opncls.texi
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@node Internal, File Caching, Opening and Closing, BFD front end
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@include libbfd.texi
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@node File Caching, Linker Functions, Internal, BFD front end
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@include cache.texi
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@node Linker Functions, Hash Tables, File Caching, BFD front end
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@include linker.texi
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@node Hash Tables, , Linker Functions, BFD front end
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@include hash.texi
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@node BFD back ends, GNU Free Documentation License, BFD front end, Top
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@chapter BFD back ends
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@menu
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* What to Put Where::
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* aout :: a.out backends
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* coff :: coff backends
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* elf :: elf backends
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* mmo :: mmo backend
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@ignore
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* srecord :: s-record backend
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@end ignore
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@end menu
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@node What to Put Where, aout, BFD back ends, BFD back ends
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@section What to Put Where
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All of BFD lives in one directory.
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@node aout, coff, What to Put Where, BFD back ends
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@include aoutx.texi
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@node coff, elf, aout, BFD back ends
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@include coffcode.texi
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@node elf, mmo, coff, BFD back ends
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@include elf.texi
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@c Leave this out until the file has some actual contents...
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@c @include elfcode.texi
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@node mmo, , elf, BFD back ends
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@include mmo.texi
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@node GNU Free Documentation License, BFD Index, BFD back ends, Top
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@include fdl.texi
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@node BFD Index, , GNU Free Documentation License, Top
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@unnumbered BFD Index
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@printindex cp
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@tex
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% I think something like @@colophon should be in texinfo. In the
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% meantime:
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\long\def\colophon{\hbox to0pt{}\vfill
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\centerline{The body of this manual is set in}
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\centerline{\fontname\tenrm,}
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\centerline{with headings in {\bf\fontname\tenbf}}
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\centerline{and examples in {\tt\fontname\tentt}.}
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\centerline{{\it\fontname\tenit\/} and}
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\centerline{{\sl\fontname\tensl\/}}
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\centerline{are used for emphasis.}\vfill}
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\page\colophon
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% Blame: doc@@cygnus.com, 28mar91.
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@end tex
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@bye
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