[Bug gdb/23555] New: Segmentation fault on attempt to print warning that getcwd failed

[b7.10110111 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

Bug ID: 23555
Summary: Segmentation fault on attempt to print warning that
getcwd failed
Product: gdb
Version: 8.2
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: b7.10110111 at gmail dot com
Target Milestone: ---

On my aarch64-based Android system GDB fails to getcwd() from main() to obtain
current_directory (due to EACCES). This results in the attempt to print a
warning using perror_warning_with_name. But when this function finally lands in
vwarning(), the latter calls target_supports_terminal_ours(), which, in its
turn, dereferences current_top_target(), which is NULL since gdb_init (which
does target_stack::push with a dummy target) would only be called later.

Now, even if I apply a workaround like `if(!current_top_target()) return
false;` before dereferencing the pointer, GDB crashes later, when I execute
e.g. "starti" command. Not sure what this influences, but faking
current_directory with "/" in the case when getcwd failed prevents further
crashes, so that I'm at least able to use GDB.

On systems where getcwd works without problems this failure can be simulated by
replacing the call by NULL. Then all the symptoms can be reproduced.

[sergiodj at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

Sergio Durigan Junior <sergiodj at redhat dot com> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |sergiodj at redhat dot com

--- Comment #1 from Sergio Durigan Junior <sergiodj at redhat dot com> ---
Thanks for the report.

I managed to reproduce the problem here. I'm not really sure what to do when
we can't determine the current working directory; GDB relies on it for some
important things (locating the binary is one of them), and that's why just
using "/" doesn't really work (aside from the fact that "/" is UNIX centric).

It seems to me that a better approach here would be to just bail out, instead
of trying to workaround the failure. I'll think better about this tomorrow,
and try to come up with a solution.

As for the current_top_target () == NULL failure, I'll submit a patch soon to
fix it.

Thanks.

[sergiodj at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

Sergio Durigan Junior <sergiodj at redhat dot com> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-22
Assignee|unassigned at sourceware dot org |sergiodj at redhat dot com
Ever confirmed|0 |1

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Sergio Durigan Junior
<***@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7a6dbc2fdb2323c35e981f93236f323e9d7c0b24

commit 7a6dbc2fdb2323c35e981f93236f323e9d7c0b24
Author: Sergio Durigan Junior <***@redhat.com>
Date: Mon Aug 27 18:56:03 2018 -0400

Update gnulib to current upstream master

It has been a while since we don't update our gnulib copy against
their upstream master branch, so I thought I'd propose this patch. It
also fixes (at least) one bug reported against GDB:

https://sourceware.org/bugzilla/show_bug.cgi?id=23558

The problem reported there is about the replacement of 'getcwd' when
cross-compiling GDB. With our current gnulib copy, the mechanism for
deciding whether to use the system's 'getcwd' or gnulib's version is
too simplistic and pessimistic, so when cross-compiling we always end
up using gnulib's version, which has a limitation: it cannot handle
the situation when the parent directory doesn't have read permissions.

This has been reported against upstream gnulib and the fix has been
pushed here:


https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=a96d2e67052c879b1bcc5bc461722beac75fc372

I regtested this patch on Fedora 28 x86-64, and there were no
regressions.

OK?

gdb/ChangeLog:

2018-08-29 Sergio Durigan Junior <***@redhat.com>

PR gdb/23555
PR gdb/23558
* gnulib/aclocal.m4: Regenerate.
* gnulib/config.in: Regenerate.
* gnulib/configure: Regenerate.
* gnulib/import/Makefile.am: Update.
* gnulib/import/Makefile.in: Update.
* gnulib/import/extra/snippet/_Noreturn.h: Rename to...
* gnulib/import/_Noreturn.h: ... this.
* gnulib/import/alloca.in.h: Update.
* gnulib/import/extra/snippet/arg-nonnull.h: Rename to...
* gnulib/import/arg-nonnull.h: ... this.
* gnulib/import/assure.h: Update.
* gnulib/import/at-func.c: Update.
* gnulib/import/basename-lgpl.c: Update.
* gnulib/import/extra/snippet/c++defs.h: Rename to...
* gnulib/import/c++defs.h: ... this.
* gnulib/import/canonicalize-lgpl.c: Update.
* gnulib/import/cdefs.h: Update.
* gnulib/import/chdir-long.c: Update.
* gnulib/import/chdir-long.h: Update.
* gnulib/import/cloexec.c: Update.
* gnulib/import/cloexec.h: Update.
* gnulib/import/close.c: Update.
* gnulib/import/closedir.c: Update.
* gnulib/import/config.charset: Update.
* gnulib/import/dirent-private.h: Update.
* gnulib/import/dirent.in.h: Update.
* gnulib/import/dirfd.c: Update.
* gnulib/import/dirname-lgpl.c: Update.
* gnulib/import/dirname.h: Update.
* gnulib/import/dosname.h: Update.
* gnulib/import/dup-safer-flag.c: Update.
* gnulib/import/dup-safer.c: Update.
* gnulib/import/dup.c: Update.
* gnulib/import/dup2.c: Update.
* gnulib/import/errno.in.h: Update.
* gnulib/import/error.c: Update.
* gnulib/import/error.h: Update.
* gnulib/import/exitfail.c: Update.
* gnulib/import/exitfail.h: Update.
* gnulib/import/extra/update-copyright: Update.
* gnulib/import/fchdir.c: Update.
* gnulib/import/fcntl.c: Update.
* gnulib/import/fcntl.in.h: Update.
* gnulib/import/fd-hook.c: Update.
* gnulib/import/fd-hook.h: Update.
* gnulib/import/fd-safer-flag.c: Update.
* gnulib/import/fd-safer.c: Update.
* gnulib/import/fdopendir.c: Update.
* gnulib/import/filename.h: Update.
* gnulib/import/filenamecat-lgpl.c: Update.
* gnulib/import/filenamecat.h: Update.
* gnulib/import/flexmember.h: Update.
* gnulib/import/float+.h: Update.
* gnulib/import/float.c: Update.
* gnulib/import/float.in.h: Update.
* gnulib/import/fnmatch.c: Update.
* gnulib/import/fnmatch.in.h: Update.
* gnulib/import/fnmatch_loop.c: Update.
* gnulib/import/fpucw.h: Update.
* gnulib/import/frexp.c: Update.
* gnulib/import/frexpl.c: Update.
* gnulib/import/fstat.c: Update.
* gnulib/import/fstatat.c: Update.
* gnulib/import/getcwd-lgpl.c: Update.
* gnulib/import/getcwd.c: Update.
* gnulib/import/getdtablesize.c: Update.
* gnulib/import/getlogin_r.c: Update.
* gnulib/import/getprogname.c: Update.
* gnulib/import/getprogname.h: Update.
* gnulib/import/gettext.h: Update.
* gnulib/import/gettimeofday.c: Update.
* gnulib/import/glob-libc.h: Update.
* gnulib/import/glob.c: Update.
* gnulib/import/glob.in.h: Update.
* gnulib/import/glob_internal.h: Update.
* gnulib/import/glob_pattern_p.c: Update.
* gnulib/import/globfree.c: Update.
* gnulib/import/hard-locale.c: Update.
* gnulib/import/hard-locale.h: Update.
* gnulib/import/intprops.h: Update.
* gnulib/import/inttypes.in.h: Update.
* gnulib/import/isnan.c: Update.
* gnulib/import/isnand-nolibm.h: Update.
* gnulib/import/isnand.c: Update.
* gnulib/import/isnanl-nolibm.h: Update.
* gnulib/import/isnanl.c: Update.
* gnulib/import/itold.c: Update.
* gnulib/import/libc-config.h: Update.
* gnulib/import/limits.in.h: Update.
* gnulib/import/localcharset.c: Update.
* gnulib/import/localcharset.h: Update.
* gnulib/import/localtime-buffer.c: Update.
* gnulib/import/localtime-buffer.h: Update.
* gnulib/import/lstat.c: Update.
* gnulib/import/m4/00gnulib.m4: Update.
* gnulib/import/m4/__inline.m4: Update.
* gnulib/import/m4/absolute-header.m4: Update.
* gnulib/import/m4/alloca.m4: Update.
* gnulib/import/m4/builtin-expect.m4: Update.
* gnulib/import/m4/canonicalize.m4: Update.
* gnulib/import/m4/chdir-long.m4: Update.
* gnulib/import/m4/close.m4: Update.
* gnulib/import/m4/closedir.m4: Update.
* gnulib/import/m4/configmake.m4: Update.
* gnulib/import/m4/d-ino.m4: Update.
* gnulib/import/m4/d-type.m4: Update.
* gnulib/import/m4/dirent_h.m4: Update.
* gnulib/import/m4/dirfd.m4: Update.
* gnulib/import/m4/dirname.m4: Update.
* gnulib/import/m4/double-slash-root.m4: Update.
* gnulib/import/m4/dup.m4: Update.
* gnulib/import/m4/dup2.m4: Update.
* gnulib/import/m4/eealloc.m4: Update.
* gnulib/import/m4/environ.m4: Update.
* gnulib/import/m4/errno_h.m4: Update.
* gnulib/import/m4/error.m4: Update.
* gnulib/import/m4/exponentd.m4: Update.
* gnulib/import/m4/exponentl.m4: Update.
* gnulib/import/m4/extensions.m4: Update.
* gnulib/import/m4/extern-inline.m4: Update.
* gnulib/import/m4/fchdir.m4: Update.
* gnulib/import/m4/fcntl-o.m4: Update.
* gnulib/import/m4/fcntl.m4: Update.
* gnulib/import/m4/fcntl_h.m4: Update.
* gnulib/import/m4/fdopendir.m4: Update.
* gnulib/import/m4/filenamecat.m4: Update.
* gnulib/import/m4/flexmember.m4: Update.
* gnulib/import/m4/float_h.m4: Update.
* gnulib/import/m4/fnmatch.m4: Update.
* gnulib/import/m4/fnmatch_h.m4: Update.
* gnulib/import/m4/fpieee.m4: Update.
* gnulib/import/m4/frexp.m4: Update.
* gnulib/import/m4/frexpl.m4: Update.
* gnulib/import/m4/fstat.m4: Update.
* gnulib/import/m4/fstatat.m4: Update.
* gnulib/import/m4/getcwd-abort-bug.m4: Update.
* gnulib/import/m4/getcwd-path-max.m4: Update.
* gnulib/import/m4/getcwd.m4: Update.
* gnulib/import/m4/getdtablesize.m4: Update.
* gnulib/import/m4/getlogin.m4: Update.
* gnulib/import/m4/getlogin_r.m4: Update.
* gnulib/import/m4/getpagesize.m4: Update.
* gnulib/import/m4/getprogname.m4: Update.
* gnulib/import/m4/gettimeofday.m4: Update.
* gnulib/import/m4/glibc21.m4: Update.
* gnulib/import/m4/glob.m4: Update.
* gnulib/import/m4/glob_h.m4: Update.
* gnulib/import/m4/gnulib-cache.m4: Update.
* gnulib/import/m4/gnulib-common.m4: Update.
* gnulib/import/m4/gnulib-comp.m4: Update.
* gnulib/import/m4/gnulib-tool.m4: Update.
* gnulib/import/m4/hard-locale.m4: Update.
* gnulib/import/m4/include_next.m4: Update.
* gnulib/import/m4/inttypes-pri.m4: Update.
* gnulib/import/m4/inttypes.m4: Update.
* gnulib/import/m4/isnand.m4: Update.
* gnulib/import/m4/isnanl.m4: Update.
* gnulib/import/m4/largefile.m4: Update.
* gnulib/import/m4/limits-h.m4: Update.
* gnulib/import/m4/localcharset.m4: Update.
* gnulib/import/m4/locale-fr.m4: Update.
* gnulib/import/m4/locale-ja.m4: Update.
* gnulib/import/m4/locale-zh.m4: Update.
* gnulib/import/m4/localtime-buffer.m4: Update.
* gnulib/import/m4/longlong.m4: Update.
* gnulib/import/m4/lstat.m4: Update.
* gnulib/import/m4/malloc.m4: Update.
* gnulib/import/m4/malloca.m4: Update.
* gnulib/import/m4/math_h.m4: Update.
* gnulib/import/m4/mbrtowc.m4: Update.
* gnulib/import/m4/mbsinit.m4: Update.
* gnulib/import/m4/mbsrtowcs.m4: Update.
* gnulib/import/m4/mbstate_t.m4: Update.
* gnulib/import/m4/memchr.m4: Update.
* gnulib/import/m4/memmem.m4: Update.
* gnulib/import/m4/mempcpy.m4: Update.
* gnulib/import/m4/memrchr.m4: Update.
* gnulib/import/m4/mkdir.m4: Update.
* gnulib/import/m4/mkstemp.m4: Update.
* gnulib/import/m4/mmap-anon.m4: Update.
* gnulib/import/m4/mode_t.m4: Update.
* gnulib/import/m4/msvc-inval.m4: Update.
* gnulib/import/m4/msvc-nothrow.m4: Update.
* gnulib/import/m4/multiarch.m4: Update.
* gnulib/import/m4/nocrash.m4: Update.
* gnulib/import/m4/off_t.m4: Update.
* gnulib/import/m4/onceonly.m4: Update.
* gnulib/import/m4/open-cloexec.m4: Update.
* gnulib/import/m4/open.m4: Update.
* gnulib/import/m4/openat.m4: Update.
* gnulib/import/m4/opendir.m4: Update.
* gnulib/import/m4/pathmax.m4: Update.
* gnulib/import/m4/rawmemchr.m4: Update.
* gnulib/import/m4/readdir.m4: Update.
* gnulib/import/m4/readlink.m4: Update.
* gnulib/import/m4/realloc.m4: Update.
* gnulib/import/m4/rename.m4: Update.
* gnulib/import/m4/rewinddir.m4: Update.
* gnulib/import/m4/rmdir.m4: Update.
* gnulib/import/m4/save-cwd.m4: Update.
* gnulib/import/m4/secure_getenv.m4: Update.
* gnulib/import/m4/setenv.m4: Update.
* gnulib/import/m4/signal_h.m4: Update.
* gnulib/import/m4/ssize_t.m4: Update.
* gnulib/import/m4/stat-time.m4: Update.
* gnulib/import/m4/stat.m4: Update.
* gnulib/import/m4/std-gnu11.m4: Update.
* gnulib/import/m4/stdbool.m4: Update.
* gnulib/import/m4/stddef_h.m4: Update.
* gnulib/import/m4/stdint.m4: Update.
* gnulib/import/m4/stdio_h.m4: Update.
* gnulib/import/m4/stdlib_h.m4: Update.
* gnulib/import/m4/strchrnul.m4: Update.
* gnulib/import/m4/strdup.m4: Update.
* gnulib/import/m4/strerror.m4: Update.
* gnulib/import/m4/string_h.m4: Update.
* gnulib/import/m4/strstr.m4: Update.
* gnulib/import/m4/strtok_r.m4: Update.
* gnulib/import/m4/sys_socket_h.m4: Update.
* gnulib/import/m4/sys_stat_h.m4: Update.
* gnulib/import/m4/sys_time_h.m4: Update.
* gnulib/import/m4/sys_types_h.m4: Update.
* gnulib/import/m4/tempname.m4: Update.
* gnulib/import/m4/time_h.m4: Update.
* gnulib/import/m4/unistd-safer.m4: Update.
* gnulib/import/m4/unistd_h.m4: Update.
* gnulib/import/m4/warn-on-use.m4: Update.
* gnulib/import/m4/wchar_h.m4: Update.
* gnulib/import/m4/wchar_t.m4: Update.
* gnulib/import/m4/wctype_h.m4: Update.
* gnulib/import/m4/wint_t.m4: Update.
* gnulib/import/malloc.c: Update.
* gnulib/import/malloc/scratch_buffer.h: Update.
* gnulib/import/malloc/scratch_buffer_grow.c: Update.
* gnulib/import/malloc/scratch_buffer_grow_preserve.c: Update.
* gnulib/import/malloc/scratch_buffer_set_array_size.c: Update.
* gnulib/import/malloca.c: Update.
* gnulib/import/malloca.h: Update.
* gnulib/import/malloca.valgrind: Update.
* gnulib/import/math.in.h: Update.
* gnulib/import/mbrtowc.c: Update.
* gnulib/import/mbsinit.c: Update.
* gnulib/import/mbsrtowcs-impl.h: Update.
* gnulib/import/mbsrtowcs-state.c: Update.
* gnulib/import/mbsrtowcs.c: Update.
* gnulib/import/memchr.c: Update.
* gnulib/import/memmem.c: Update.
* gnulib/import/mempcpy.c: Update.
* gnulib/import/memrchr.c: Update.
* gnulib/import/mkdir.c: Update.
* gnulib/import/mkstemp.c: Update.
* gnulib/import/msvc-inval.c: Update.
* gnulib/import/msvc-inval.h: Update.
* gnulib/import/msvc-nothrow.c: Update.
* gnulib/import/msvc-nothrow.h: Update.
* gnulib/import/open.c: Update.
* gnulib/import/openat-die.c: Update.
* gnulib/import/openat-priv.h: Update.
* gnulib/import/openat-proc.c: Update.
* gnulib/import/openat.c: Update.
* gnulib/import/openat.h: Update.
* gnulib/import/opendir.c: Update.
* gnulib/import/pathmax.h: Update.
* gnulib/import/pipe-safer.c: Update.
* gnulib/import/rawmemchr.c: Update.
* gnulib/import/readdir.c: Update.
* gnulib/import/readlink.c: Update.
* gnulib/import/realloc.c: Update.
* gnulib/import/ref-add.sin: Update.
* gnulib/import/ref-del.sin: Update.
* gnulib/import/rename.c: Update.
* gnulib/import/rewinddir.c: Update.
* gnulib/import/rmdir.c: Update.
* gnulib/import/same-inode.h: Update.
* gnulib/import/save-cwd.c: Update.
* gnulib/import/save-cwd.h: Update.
* gnulib/import/scratch_buffer.h: Update.
* gnulib/import/secure_getenv.c: Update.
* gnulib/import/setenv.c: Update.
* gnulib/import/signal.in.h: Update.
* gnulib/import/stat-time.c: Update.
* gnulib/import/stat-time.h: Update.
* gnulib/import/stat-w32.c: Update.
* gnulib/import/stat-w32.h: Update.
* gnulib/import/stat.c: Update.
* gnulib/import/stdbool.in.h: Update.
* gnulib/import/stddef.in.h: Update.
* gnulib/import/stdint.in.h: Update.
* gnulib/import/stdio.in.h: Update.
* gnulib/import/stdlib.in.h: Update.
* gnulib/import/str-two-way.h: Update.
* gnulib/import/strchrnul.c: Update.
* gnulib/import/strdup.c: Update.
* gnulib/import/streq.h: Update.
* gnulib/import/strerror-override.c: Update.
* gnulib/import/strerror-override.h: Update.
* gnulib/import/strerror.c: Update.
* gnulib/import/string.in.h: Update.
* gnulib/import/stripslash.c: Update.
* gnulib/import/strnlen1.c: Update.
* gnulib/import/strnlen1.h: Update.
* gnulib/import/strstr.c: Update.
* gnulib/import/strtok_r.c: Update.
* gnulib/import/sys_stat.in.h: Update.
* gnulib/import/sys_time.in.h: Update.
* gnulib/import/sys_types.in.h: Update.
* gnulib/import/tempname.c: Update.
* gnulib/import/tempname.h: Update.
* gnulib/import/time.in.h: Update.
* gnulib/import/unistd--.h: Update.
* gnulib/import/unistd-safer.h: Update.
* gnulib/import/unistd.in.h: Update.
* gnulib/import/unsetenv.c: Update.
* gnulib/import/verify.h: Update.
* gnulib/import/extra/snippet/warn-on-use.h: Update.
* gnulib/import/wchar.in.h: Update.
* gnulib/import/wctype.in.h: Update.
* gnulib/import/xalloc-oversized.h: Update.
* gnulib/update-gnulib.sh (GNULIB_COMMIT_SHA1): Set to
"53e2c179f26a890fa6685af4b6c1397ee370433b".

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Sergio Durigan Junior
<***@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5e8754f90abbbf832987477eea4ee91a9d2f694c

commit 5e8754f90abbbf832987477eea4ee91a9d2f694c
Author: Sergio Durigan Junior <***@redhat.com>
Date: Mon Sep 10 12:22:59 2018 -0400

Revert "Update gnulib to current upstream master"

This reverts commit 7a6dbc2fdb2323c35e981f93236f323e9d7c0b24 ("Update
gnulib to current upstream master"). It is needed because the gnulib
update caused problems with people using old GCC compilers (version
4.8, for example), which support C99 but don't default to using it.
Unfortunately this broke GDB for these users. A more detailed report
of what happened can be found at:

https://lists.gnu.org/archive/html/bug-gnulib/2018-08/msg00157.html

The reason for updating our gnulib copy was to fix PR gdb/23558.
Reverting this patch reintroduces the bug, so in order to fix it I
will submit a subsequent patch which cherry-picks the fix from gnulib.

gdb/ChangeLog:
2018-09-10 Sergio Durigan Junior <***@redhat.com>

Revert:
2018-08-29 Sergio Durigan Junior <***@redhat.com>

PR gdb/23555
PR gdb/23558
* gnulib/aclocal.m4: Regenerate.
* gnulib/config.in: Regenerate.
* gnulib/configure: Regenerate.
* gnulib/import/Makefile.am: Update.
* gnulib/import/Makefile.in: Update.
* gnulib/import/extra/snippet/_Noreturn.h: Rename to...
* gnulib/import/_Noreturn.h: ... this.
* gnulib/import/alloca.in.h: Update.
* gnulib/import/extra/snippet/arg-nonnull.h: Rename to...
* gnulib/import/arg-nonnull.h: ... this.
* gnulib/import/assure.h: Update.
* gnulib/import/at-func.c: Update.
* gnulib/import/basename-lgpl.c: Update.
* gnulib/import/extra/snippet/c++defs.h: Rename to...
* gnulib/import/c++defs.h: ... this.
* gnulib/import/canonicalize-lgpl.c: Update.
* gnulib/import/cdefs.h: Update.
* gnulib/import/chdir-long.c: Update.
* gnulib/import/chdir-long.h: Update.
* gnulib/import/cloexec.c: Update.
* gnulib/import/cloexec.h: Update.
* gnulib/import/close.c: Update.
* gnulib/import/closedir.c: Update.
* gnulib/import/config.charset: Update.
* gnulib/import/dirent-private.h: Update.
* gnulib/import/dirent.in.h: Update.
* gnulib/import/dirfd.c: Update.
* gnulib/import/dirname-lgpl.c: Update.
* gnulib/import/dirname.h: Update.
* gnulib/import/dosname.h: Update.
* gnulib/import/dup-safer-flag.c: Update.
* gnulib/import/dup-safer.c: Update.
* gnulib/import/dup.c: Update.
* gnulib/import/dup2.c: Update.
* gnulib/import/errno.in.h: Update.
* gnulib/import/error.c: Update.
* gnulib/import/error.h: Update.
* gnulib/import/exitfail.c: Update.
* gnulib/import/exitfail.h: Update.
* gnulib/import/extra/update-copyright: Update.
* gnulib/import/fchdir.c: Update.
* gnulib/import/fcntl.c: Update.
* gnulib/import/fcntl.in.h: Update.
* gnulib/import/fd-hook.c: Update.
* gnulib/import/fd-hook.h: Update.
* gnulib/import/fd-safer-flag.c: Update.
* gnulib/import/fd-safer.c: Update.
* gnulib/import/fdopendir.c: Update.
* gnulib/import/filename.h: Update.
* gnulib/import/filenamecat-lgpl.c: Update.
* gnulib/import/filenamecat.h: Update.
* gnulib/import/flexmember.h: Update.
* gnulib/import/float+.h: Update.
* gnulib/import/float.c: Update.
* gnulib/import/float.in.h: Update.
* gnulib/import/fnmatch.c: Update.
* gnulib/import/fnmatch.in.h: Update.
* gnulib/import/fnmatch_loop.c: Update.
* gnulib/import/fpucw.h: Update.
* gnulib/import/frexp.c: Update.
* gnulib/import/frexpl.c: Update.
* gnulib/import/fstat.c: Update.
* gnulib/import/fstatat.c: Update.
* gnulib/import/getcwd-lgpl.c: Update.
* gnulib/import/getcwd.c: Update.
* gnulib/import/getdtablesize.c: Update.
* gnulib/import/getlogin_r.c: Update.
* gnulib/import/getprogname.c: Update.
* gnulib/import/getprogname.h: Update.
* gnulib/import/gettext.h: Update.
* gnulib/import/gettimeofday.c: Update.
* gnulib/import/glob-libc.h: Update.
* gnulib/import/glob.c: Update.
* gnulib/import/glob.in.h: Update.
* gnulib/import/glob_internal.h: Update.
* gnulib/import/glob_pattern_p.c: Update.
* gnulib/import/globfree.c: Update.
* gnulib/import/hard-locale.c: Update.
* gnulib/import/hard-locale.h: Update.
* gnulib/import/intprops.h: Update.
* gnulib/import/inttypes.in.h: Update.
* gnulib/import/isnan.c: Update.
* gnulib/import/isnand-nolibm.h: Update.
* gnulib/import/isnand.c: Update.
* gnulib/import/isnanl-nolibm.h: Update.
* gnulib/import/isnanl.c: Update.
* gnulib/import/itold.c: Update.
* gnulib/import/libc-config.h: Update.
* gnulib/import/limits.in.h: Update.
* gnulib/import/localcharset.c: Update.
* gnulib/import/localcharset.h: Update.
* gnulib/import/localtime-buffer.c: Update.
* gnulib/import/localtime-buffer.h: Update.
* gnulib/import/lstat.c: Update.
* gnulib/import/m4/00gnulib.m4: Update.
* gnulib/import/m4/__inline.m4: Update.
* gnulib/import/m4/absolute-header.m4: Update.
* gnulib/import/m4/alloca.m4: Update.
* gnulib/import/m4/builtin-expect.m4: Update.
* gnulib/import/m4/canonicalize.m4: Update.
* gnulib/import/m4/chdir-long.m4: Update.
* gnulib/import/m4/close.m4: Update.
* gnulib/import/m4/closedir.m4: Update.
* gnulib/import/m4/configmake.m4: Update.
* gnulib/import/m4/d-ino.m4: Update.
* gnulib/import/m4/d-type.m4: Update.
* gnulib/import/m4/dirent_h.m4: Update.
* gnulib/import/m4/dirfd.m4: Update.
* gnulib/import/m4/dirname.m4: Update.
* gnulib/import/m4/double-slash-root.m4: Update.
* gnulib/import/m4/dup.m4: Update.
* gnulib/import/m4/dup2.m4: Update.
* gnulib/import/m4/eealloc.m4: Update.
* gnulib/import/m4/environ.m4: Update.
* gnulib/import/m4/errno_h.m4: Update.
* gnulib/import/m4/error.m4: Update.
* gnulib/import/m4/exponentd.m4: Update.
* gnulib/import/m4/exponentl.m4: Update.
* gnulib/import/m4/extensions.m4: Update.
* gnulib/import/m4/extern-inline.m4: Update.
* gnulib/import/m4/fchdir.m4: Update.
* gnulib/import/m4/fcntl-o.m4: Update.
* gnulib/import/m4/fcntl.m4: Update.
* gnulib/import/m4/fcntl_h.m4: Update.
* gnulib/import/m4/fdopendir.m4: Update.
* gnulib/import/m4/filenamecat.m4: Update.
* gnulib/import/m4/flexmember.m4: Update.
* gnulib/import/m4/float_h.m4: Update.
* gnulib/import/m4/fnmatch.m4: Update.
* gnulib/import/m4/fnmatch_h.m4: Update.
* gnulib/import/m4/fpieee.m4: Update.
* gnulib/import/m4/frexp.m4: Update.
* gnulib/import/m4/frexpl.m4: Update.
* gnulib/import/m4/fstat.m4: Update.
* gnulib/import/m4/fstatat.m4: Update.
* gnulib/import/m4/getcwd-abort-bug.m4: Update.
* gnulib/import/m4/getcwd-path-max.m4: Update.
* gnulib/import/m4/getcwd.m4: Update.
* gnulib/import/m4/getdtablesize.m4: Update.
* gnulib/import/m4/getlogin.m4: Update.
* gnulib/import/m4/getlogin_r.m4: Update.
* gnulib/import/m4/getpagesize.m4: Update.
* gnulib/import/m4/getprogname.m4: Update.
* gnulib/import/m4/gettimeofday.m4: Update.
* gnulib/import/m4/glibc21.m4: Update.
* gnulib/import/m4/glob.m4: Update.
* gnulib/import/m4/glob_h.m4: Update.
* gnulib/import/m4/gnulib-cache.m4: Update.
* gnulib/import/m4/gnulib-common.m4: Update.
* gnulib/import/m4/gnulib-comp.m4: Update.
* gnulib/import/m4/gnulib-tool.m4: Update.
* gnulib/import/m4/hard-locale.m4: Update.
* gnulib/import/m4/include_next.m4: Update.
* gnulib/import/m4/inttypes-pri.m4: Update.
* gnulib/import/m4/inttypes.m4: Update.
* gnulib/import/m4/isnand.m4: Update.
* gnulib/import/m4/isnanl.m4: Update.
* gnulib/import/m4/largefile.m4: Update.
* gnulib/import/m4/limits-h.m4: Update.
* gnulib/import/m4/localcharset.m4: Update.
* gnulib/import/m4/locale-fr.m4: Update.
* gnulib/import/m4/locale-ja.m4: Update.
* gnulib/import/m4/locale-zh.m4: Update.
* gnulib/import/m4/localtime-buffer.m4: Update.
* gnulib/import/m4/longlong.m4: Update.
* gnulib/import/m4/lstat.m4: Update.
* gnulib/import/m4/malloc.m4: Update.
* gnulib/import/m4/malloca.m4: Update.
* gnulib/import/m4/math_h.m4: Update.
* gnulib/import/m4/mbrtowc.m4: Update.
* gnulib/import/m4/mbsinit.m4: Update.
* gnulib/import/m4/mbsrtowcs.m4: Update.
* gnulib/import/m4/mbstate_t.m4: Update.
* gnulib/import/m4/memchr.m4: Update.
* gnulib/import/m4/memmem.m4: Update.
* gnulib/import/m4/mempcpy.m4: Update.
* gnulib/import/m4/memrchr.m4: Update.
* gnulib/import/m4/mkdir.m4: Update.
* gnulib/import/m4/mkstemp.m4: Update.
* gnulib/import/m4/mmap-anon.m4: Update.
* gnulib/import/m4/mode_t.m4: Update.
* gnulib/import/m4/msvc-inval.m4: Update.
* gnulib/import/m4/msvc-nothrow.m4: Update.
* gnulib/import/m4/multiarch.m4: Update.
* gnulib/import/m4/nocrash.m4: Update.
* gnulib/import/m4/off_t.m4: Update.
* gnulib/import/m4/onceonly.m4: Update.
* gnulib/import/m4/open-cloexec.m4: Update.
* gnulib/import/m4/open.m4: Update.
* gnulib/import/m4/openat.m4: Update.
* gnulib/import/m4/opendir.m4: Update.
* gnulib/import/m4/pathmax.m4: Update.
* gnulib/import/m4/rawmemchr.m4: Update.
* gnulib/import/m4/readdir.m4: Update.
* gnulib/import/m4/readlink.m4: Update.
* gnulib/import/m4/realloc.m4: Update.
* gnulib/import/m4/rename.m4: Update.
* gnulib/import/m4/rewinddir.m4: Update.
* gnulib/import/m4/rmdir.m4: Update.
* gnulib/import/m4/save-cwd.m4: Update.
* gnulib/import/m4/secure_getenv.m4: Update.
* gnulib/import/m4/setenv.m4: Update.
* gnulib/import/m4/signal_h.m4: Update.
* gnulib/import/m4/ssize_t.m4: Update.
* gnulib/import/m4/stat-time.m4: Update.
* gnulib/import/m4/stat.m4: Update.
* gnulib/import/m4/std-gnu11.m4: Update.
* gnulib/import/m4/stdbool.m4: Update.
* gnulib/import/m4/stddef_h.m4: Update.
* gnulib/import/m4/stdint.m4: Update.
* gnulib/import/m4/stdio_h.m4: Update.
* gnulib/import/m4/stdlib_h.m4: Update.
* gnulib/import/m4/strchrnul.m4: Update.
* gnulib/import/m4/strdup.m4: Update.
* gnulib/import/m4/strerror.m4: Update.
* gnulib/import/m4/string_h.m4: Update.
* gnulib/import/m4/strstr.m4: Update.
* gnulib/import/m4/strtok_r.m4: Update.
* gnulib/import/m4/sys_socket_h.m4: Update.
* gnulib/import/m4/sys_stat_h.m4: Update.
* gnulib/import/m4/sys_time_h.m4: Update.
* gnulib/import/m4/sys_types_h.m4: Update.
* gnulib/import/m4/tempname.m4: Update.
* gnulib/import/m4/time_h.m4: Update.
* gnulib/import/m4/unistd-safer.m4: Update.
* gnulib/import/m4/unistd_h.m4: Update.
* gnulib/import/m4/warn-on-use.m4: Update.
* gnulib/import/m4/wchar_h.m4: Update.
* gnulib/import/m4/wchar_t.m4: Update.
* gnulib/import/m4/wctype_h.m4: Update.
* gnulib/import/m4/wint_t.m4: Update.
* gnulib/import/malloc.c: Update.
* gnulib/import/malloc/scratch_buffer.h: Update.
* gnulib/import/malloc/scratch_buffer_grow.c: Update.
* gnulib/import/malloc/scratch_buffer_grow_preserve.c: Update.
* gnulib/import/malloc/scratch_buffer_set_array_size.c: Update.
* gnulib/import/malloca.c: Update.
* gnulib/import/malloca.h: Update.
* gnulib/import/malloca.valgrind: Update.
* gnulib/import/math.in.h: Update.
* gnulib/import/mbrtowc.c: Update.
* gnulib/import/mbsinit.c: Update.
* gnulib/import/mbsrtowcs-impl.h: Update.
* gnulib/import/mbsrtowcs-state.c: Update.
* gnulib/import/mbsrtowcs.c: Update.
* gnulib/import/memchr.c: Update.
* gnulib/import/memmem.c: Update.
* gnulib/import/mempcpy.c: Update.
* gnulib/import/memrchr.c: Update.
* gnulib/import/mkdir.c: Update.
* gnulib/import/mkstemp.c: Update.
* gnulib/import/msvc-inval.c: Update.
* gnulib/import/msvc-inval.h: Update.
* gnulib/import/msvc-nothrow.c: Update.
* gnulib/import/msvc-nothrow.h: Update.
* gnulib/import/open.c: Update.
* gnulib/import/openat-die.c: Update.
* gnulib/import/openat-priv.h: Update.
* gnulib/import/openat-proc.c: Update.
* gnulib/import/openat.c: Update.
* gnulib/import/openat.h: Update.
* gnulib/import/opendir.c: Update.
* gnulib/import/pathmax.h: Update.
* gnulib/import/pipe-safer.c: Update.
* gnulib/import/rawmemchr.c: Update.
* gnulib/import/readdir.c: Update.
* gnulib/import/readlink.c: Update.
* gnulib/import/realloc.c: Update.
* gnulib/import/ref-add.sin: Update.
* gnulib/import/ref-del.sin: Update.
* gnulib/import/rename.c: Update.
* gnulib/import/rewinddir.c: Update.
* gnulib/import/rmdir.c: Update.
* gnulib/import/same-inode.h: Update.
* gnulib/import/save-cwd.c: Update.
* gnulib/import/save-cwd.h: Update.
* gnulib/import/scratch_buffer.h: Update.
* gnulib/import/secure_getenv.c: Update.
* gnulib/import/setenv.c: Update.
* gnulib/import/signal.in.h: Update.
* gnulib/import/stat-time.c: Update.
* gnulib/import/stat-time.h: Update.
* gnulib/import/stat-w32.c: Update.
* gnulib/import/stat-w32.h: Update.
* gnulib/import/stat.c: Update.
* gnulib/import/stdbool.in.h: Update.
* gnulib/import/stddef.in.h: Update.
* gnulib/import/stdint.in.h: Update.
* gnulib/import/stdio.in.h: Update.
* gnulib/import/stdlib.in.h: Update.
* gnulib/import/str-two-way.h: Update.
* gnulib/import/strchrnul.c: Update.
* gnulib/import/strdup.c: Update.
* gnulib/import/streq.h: Update.
* gnulib/import/strerror-override.c: Update.
* gnulib/import/strerror-override.h: Update.
* gnulib/import/strerror.c: Update.
* gnulib/import/string.in.h: Update.
* gnulib/import/stripslash.c: Update.
* gnulib/import/strnlen1.c: Update.
* gnulib/import/strnlen1.h: Update.
* gnulib/import/strstr.c: Update.
* gnulib/import/strtok_r.c: Update.
* gnulib/import/sys_stat.in.h: Update.
* gnulib/import/sys_time.in.h: Update.
* gnulib/import/sys_types.in.h: Update.
* gnulib/import/tempname.c: Update.
* gnulib/import/tempname.h: Update.
* gnulib/import/time.in.h: Update.
* gnulib/import/unistd--.h: Update.
* gnulib/import/unistd-safer.h: Update.
* gnulib/import/unistd.in.h: Update.
* gnulib/import/unsetenv.c: Update.
* gnulib/import/verify.h: Update.
* gnulib/import/extra/snippet/warn-on-use.h: Update.
* gnulib/import/wchar.in.h: Update.
* gnulib/import/wctype.in.h: Update.
* gnulib/import/xalloc-oversized.h: Update.
* gnulib/update-gnulib.sh (GNULIB_COMMIT_SHA1): Set to
"53e2c179f26a890fa6685af4b6c1397ee370433b".

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Sergio Durigan Junior
<***@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e2fc52e745757a11f7a4a256984cabbe5474f55a

commit e2fc52e745757a11f7a4a256984cabbe5474f55a
Author: Sergio Durigan Junior <***@redhat.com>
Date: Mon Sep 10 12:52:04 2018 -0400

Fix PR gdb/23558: Use system's 'getcwd' when cross-compiling GDB

This is a backport of a gnulib fix for the following bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=23558

The problem reported there is about the replacement of 'getcwd' when
cross-compiling GDB. With our current gnulib copy, the mechanism for
deciding whether to use the system's 'getcwd' or gnulib's version is
too simplistic and pessimistic, so when cross-compiling we always end
up using gnulib's version, which has a limitation: it cannot handle
the situation when the parent directory doesn't have read permissions.

The solution is to backport the following gnulib commit:

commit a96d2e67052c879b1bcc5bc461722beac75fc372
Author: Bruno Haible <***@clisp.org>
Date: Thu Aug 23 21:13:19 2018 +0200

getcwd: Add cross-compilation guesses.

gdb/ChangeLog:
2018-09-10 Sergio Durigan Junior <***@redhat.com>

PR gdb/23555
PR gdb/23558
* gnulib/import/m4/getcwd-path-max.m4: Add cross-compilation
guesses.

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <***@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=20f0d60db4fb5083779c4c9182bbc692f7d2bac5

commit 20f0d60db4fb5083779c4c9182bbc692f7d2bac5
Author: Tom Tromey <***@tromey.com>
Date: Fri Oct 5 14:54:35 2018 -0600

Avoid crash when calling warning too early

I noticed that if you pass the name of an existing file (not a
directory) as the argument to --data-directory, gdb will crash:

$ ./gdb -nx --data-directory ./gdb
../../binutils-gdb/gdb/target.c:590:56: runtime error: member call on
null pointer of type 'struct target_ops'

This was later reported as PR gdb/23838.

This happens because warning ends up calling
target_supports_terminal_ours, which calls current_top_target, which
returns nullptr this early.

This fixes the problem by handling this case specially in
target_supports_terminal_ours. I also changed
target_supports_terminal_ours to return bool.

gdb/ChangeLog
2018-11-08 Tom Tromey <***@tromey.com>

PR gdb/23555:
PR gdb/23838:
* target.h (target_supports_terminal_ours): Return bool.
* target.c (target_supports_terminal_ours): Handle case where
current_top_target returns nullptr. Return bool.

gdb/testsuite/ChangeLog
2018-11-08 Tom Tromey <***@tromey.com>

PR gdb/23555:
PR gdb/23838:
* gdb.base/warning.exp: New file.

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23555

--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The gdb-8.2-branch branch has been updated by Tom Tromey
<***@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=9ec912f34410c33de581b5af4a0773c12b4fe20a

commit 9ec912f34410c33de581b5af4a0773c12b4fe20a
Author: Tom Tromey <***@tromey.com>
Date: Fri Oct 5 14:54:35 2018 -0600

Avoid crash when calling warning too early

I noticed that if you pass the name of an existing file (not a
directory) as the argument to --data-directory, gdb will crash:

$ ./gdb -nx --data-directory ./gdb
../../binutils-gdb/gdb/target.c:590:56: runtime error: member call on
null pointer of type 'struct target_ops'

This was later reported as PR gdb/23838.

This happens because warning ends up calling
target_supports_terminal_ours, which calls current_top_target, which
returns nullptr this early.

This fixes the problem by handling this case specially in
target_supports_terminal_ours. I also changed
target_supports_terminal_ours to return bool.

2018-11-08 Tom Tromey <***@tromey.com>

PR gdb/23555:
PR gdb/23838:
* target.h (target_supports_terminal_ours): Return bool.
* target.c (target_supports_terminal_ours): Handle case where
current_top_target returns nullptr. Return bool.

gdb/testsuite/ChangeLog
2018-11-08 Tom Tromey <***@tromey.com>

PR gdb/23555:
PR gdb/23838:
* gdb.base/warning.exp: New file.