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Bug #13157 is about a gdb regression, where previously it could handle universal libraries, but now cannot. gdb isn't working for me on macOS for other reasons, so I wrote this small test program to show the problem: #include <config.h> #include <stdio.h> #include <stdlib.h> #include <bfd.h> void die (const char *what) { fprintf (stderr, "die: %s\n", what); exit (1); } int main (int argc, char **argv) { bfd *file = bfd_openr (argv[1], NULL); if (file == NULL) die ("couldn't open"); if (!bfd_check_format (file, bfd_archive)) die ("not an archive"); printf ("yay\n"); bfd_close (file); return 0; } Then I built a simple universal binary. With git master BFD, I get: $ ./doit ./universal-exe die: not an archive Jeff Muizelaar tracked this down to the BFD change for PR binutils/21787. This patch changed bfd_generic_archive_p to sometimes reset the BFD's "format" field. However, simply changing bfd_generic_archive_p regressed the test case in that bug. Debugging PR binutils/21787 again, what I saw is that the mach-o universal binary support acts like a bfd_archive but does not provide a _close_and_cleanup function. However, if a BFD appears as an archive member, it must always remove its own entry from its parent's map. Otherwise, when the parent is destroyed, the already-destroyed child BFD will be referenced. mach-o does not use the usual archive member support, so simply using _bfd_archive_close_and_cleanup (as other targets do) will not work. This patch fixes the problem by introducing a new _bfd_unlink_from_archive_parent function, then arranging for it to be called in the mach-o case. Ok? bfd/ChangeLog 2018-07-02 Jeff Muizelaar <jrmuizel@gmail.com> Tom Tromey <tom@tromey.com> PR 13157 PR 21787 * mach-o.c (bfd_mach_o_fat_close_and_cleanup): New function. (bfd_mach_o_close_and_cleanup): Redefine. * archive.c (_bfd_unlink_from_archive_parent): New function, extracted from.. (_bfd_archive_close_and_cleanup): ..here. (bfd_generic_archive_p): Do not clear archive's format. * libbfd-in.h (_bfd_unlink_from_archive_parent): Declare. * libbfd.h: Regenerate. |
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BFD is an object file library. It permits applications to use the
same routines to process object files regardless of their format.
BFD is used by the GNU debugger, assembler, linker, and the binary
utilities.
The documentation on using BFD is scanty and may be occasionally
incorrect. Pointers to documentation problems, or an entirely
rewritten manual, would be appreciated.
There is some BFD internals documentation in doc/bfdint.texi which may
help programmers who want to modify BFD.
BFD is normally built as part of another package. See the build
instructions for that package, probably in a README file in the
appropriate directory.
BFD supports the following configure options:
--target=TARGET
The default target for which to build the library. TARGET is
a configuration target triplet, such as sparc-sun-solaris.
--enable-targets=TARGET,TARGET,TARGET...
Additional targets the library should support. To include
support for all known targets, use --enable-targets=all.
--enable-64-bit-bfd
Include support for 64 bit targets. This is automatically
turned on if you explicitly request a 64 bit target, but not
for --enable-targets=all. This requires a compiler with a 64
bit integer type, such as gcc.
--enable-shared
Build BFD as a shared library.
--with-mmap
Use mmap when accessing files. This is faster on some hosts,
but slower on others. It may not work on all hosts.
Report bugs with BFD to bug-binutils@gnu.org.
Patches are encouraged. When sending patches, always send the output
of diff -u or diff -c from the original file to the new file. Do not
send default diff output. Do not make the diff from the new file to
the original file. Remember that any patch must not break other
systems. Remember that BFD must support cross compilation from any
host to any target, so patches which use ``#ifdef HOST'' are not
acceptable. Please also read the ``Reporting Bugs'' section of the
gcc manual.
Bug reports without patches will be remembered, but they may never get
fixed until somebody volunteers to fix them.
Copyright (C) 2012-2018 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.