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Andrew Burgess 91f2597bd2 gdb: print backtrace for internal error/warning
This commit builds on previous work to allow GDB to print a backtrace
of itself when GDB encounters an internal-error or internal-warning.
This fixes PR gdb/26377.

There's not many places where we call internal_warning, and I guess in
most cases the user would probably continue their debug session.  And
so, in order to avoid cluttering up the output, by default, printing
of a backtrace is off for internal-warnings.

In contrast, printing of a backtrace is on by default for
internal-errors, as I figure that in most cases hitting an
internal-error is going to be the end of the debug session.

Whether a backtrace is printed or not can be controlled with the new
settings:

  maintenance set internal-error backtrace on|off
  maintenance show internal-error backtrace

  maintenance set internal-warning backtrace on|off
  maintenance show internal-warning backtrace

Here is an example of what an internal-error now looks like with the
backtrace included:

  (gdb) maintenance internal-error blah
  ../../src.dev-3/gdb/maint.c:82: internal-error: blah
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  ----- Backtrace -----
  0x5c61ca gdb_internal_backtrace_1
  	../../src.dev-3/gdb/bt-utils.c:123
  0x5c626d _Z22gdb_internal_backtracev
  	../../src.dev-3/gdb/bt-utils.c:165
  0xe33237 internal_vproblem
  	../../src.dev-3/gdb/utils.c:393
  0xe33539 _Z15internal_verrorPKciS0_P13__va_list_tag
  	../../src.dev-3/gdb/utils.c:470
  0x1549652 _Z14internal_errorPKciS0_z
  	../../src.dev-3/gdbsupport/errors.cc:55
  0x9c7982 maintenance_internal_error
  	../../src.dev-3/gdb/maint.c:82
  0x636f57 do_simple_func
  	../../src.dev-3/gdb/cli/cli-decode.c:97
   .... snip, lots more backtrace lines ....
  ---------------------
  ../../src.dev-3/gdb/maint.c:82: internal-error: blah
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) y

  This is a bug, please report it.  For instructions, see:
  <https://www.gnu.org/software/gdb/bugs/>.

  ../../src.dev-3/gdb/maint.c:82: internal-error: blah
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Create a core file of GDB? (y or n) n

My hope is that this backtrace might make it slightly easier to
diagnose GDB issues if all that is provided is the console output, I
find that we frequently get reports of an assert being hit that is
located in pretty generic code (frame.c, value.c, etc) and it is not
always obvious how we might have arrived at the assert.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26377
2021-09-28 12:21:22 +01:00
bfd Automatic date update in version.in 2021-09-28 00:00:07 +00:00
binutils PR28391, strip/objcopy --preserve-dates *.a: cannot set time 2021-09-28 20:18:48 +09:30
config Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
contrib Import mklog.py from gcc repo 2020-09-25 10:24:44 -04:00
cpu Re: opcodes: constify & local meps macros 2021-07-05 21:40:49 +09:30
elfcpp PATCH [4/4] arm: Add Tag_PACRET_use build attribute 2021-08-17 14:49:42 +02:00
etc etc: switch to automake 2021-09-09 23:30:12 -04:00
gas x86: Print {bad} on invalid broadcast in OP_E_memory 2021-09-28 11:13:50 +08:00
gdb gdb: print backtrace for internal error/warning 2021-09-28 12:21:22 +01:00
gdbserver Change ptid_t::tid to ULONGEST 2021-09-23 09:30:54 -06:00
gdbsupport Change ptid_t::tid to ULONGEST 2021-09-23 09:30:54 -06:00
gnulib gnulib: import various network functions 2021-09-08 17:48:09 -04:00
gold [GOLD] PowerPC64 support for sym+addend GOT entries 2021-09-18 08:20:11 +09:30
gprof configure: regenerate in all projects that use libtool.m4 2021-09-27 20:31:24 +01:00
include Revert: [AArch64] MTE corefile support 2021-09-07 11:03:20 -03:00
intl Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
ld configure: regenerate in all projects that use libtool.m4 2021-09-27 20:31:24 +01:00
libbacktrace Copy in libbacktrace from gcc 2021-09-28 12:21:21 +01:00
libctf libctf, lookup: fix bounds of pptrtab lookup 2021-09-27 20:31:26 +01:00
libdecnumber Run autoreconf -vf throughout 2020-07-29 16:03:55 -04:00
libiberty Deprecate a.out support for NetBSD targets. 2021-08-11 13:17:54 +01:00
opcodes x86: Print {bad} on invalid broadcast in OP_E_memory 2021-09-28 11:13:50 +08:00
readline Update config.sub and config.guess for MIPS R3 and R5 ISA support 2021-05-24 18:11:49 +02:00
sim sim: drop weak func attrs on module inits 2021-09-28 01:51:38 -04:00
texinfo
zlib configure: regenerate in all projects that use libtool.m4 2021-09-27 20:31:24 +01:00
.cvsignore
.gitattributes
.gitignore Add gnu global outputs to .gitignore 2020-12-02 10:00:27 -05:00
ar-lib Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ChangeLog src-release.sh: add libbacktrace to GDB_SUPPORT_DIRS 2021-09-28 12:21:21 +01:00
compile
config-ml.in Update top level configure files by synchronizing them with gcc. 2018-01-10 15:29:21 +00:00
config.guess Update config.sub and config.guess for MIPS R3 and R5 ISA support 2021-05-24 18:11:49 +02:00
config.rpath
config.sub Update config.sub and config.guess for MIPS R3 and R5 ISA support 2021-05-24 18:11:49 +02:00
configure top-level configure: setup target_configdirs based on repository 2021-09-28 12:21:21 +01:00
configure.ac top-level configure: setup target_configdirs based on repository 2021-09-28 12:21:21 +01:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS Update the address of the FSF in the copyright notice of files which were using the old address. 2017-12-14 12:48:55 +00:00
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4 libtool.m4: fix nm BSD flag detection 2021-09-27 20:31:23 +01:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS MAINTAINERS: Update path to readline config.{sub,guess} files 2021-05-24 18:11:49 +02:00
Makefile.def gdb: Add a dependency between gdb and libbacktrace 2021-09-28 12:21:21 +01:00
Makefile.in gdb: Add a dependency between gdb and libbacktrace 2021-09-28 12:21:21 +01:00
Makefile.tpl Add missing changes to Makefile.tpl 2021-02-28 04:39:38 -08:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am Merge autoconf / automake update changes from GCC. 2018-10-31 17:10:56 +00:00
README
README-maintainer-mode Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
setup.com
src-release.sh src-release.sh: add libbacktrace to GDB_SUPPORT_DIRS 2021-09-28 12:21:21 +01:00
symlink-tree
test-driver Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
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If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
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	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

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