mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
73cc75f3b2
* PROBLEMS: Mention breakpoints/1702. * NEWS: For signal trampolines, cite s390 GNU/Linux as a system that is known to work.
145 lines
5.1 KiB
Plaintext
145 lines
5.1 KiB
Plaintext
|
|
Known problems in GDB 6.2
|
|
|
|
See also: http://www.gnu.org/software/gdb/bugs/
|
|
|
|
|
|
*** Build problems
|
|
|
|
build/1458: compile failed on hpux11
|
|
|
|
GDB has build problems on HP/UX 11 with some versions of the HP
|
|
Ansi C compiler. (GCC works fine).
|
|
|
|
The problem happens when compiling intl/bindtextdom.c.
|
|
The error is:
|
|
|
|
cc: "gettextP.h", line 50: error 1000: Unexpected symbol: "SWAP".
|
|
cc: panic 2017: Cannot recover from earlier errors, terminating.
|
|
*** Error exit code 1
|
|
|
|
This is a problem with the 'inline' keyword in gettextP.h.
|
|
The workaround is to disable 'inline' before building gdb:
|
|
|
|
export ac_cv_c_inline=no
|
|
|
|
This problem happens only with some versions of the HP Ansi C compiler.
|
|
Versions A.11.01.25171.GP and B.11.11.28706.GP have both been observed
|
|
to work; version B.11.11.04 gets the build error and needs the
|
|
workaround.
|
|
|
|
This problem might also happen with other C compilers.
|
|
|
|
*** Misc
|
|
|
|
gdb/1560: Control-C does not always interrupt GDB.
|
|
|
|
When GDB is busy processing a command which takes a long time to
|
|
complete, hitting Control-C does not have the expected effect.
|
|
The command execution is not aborted, and the "QUIT" message confirming
|
|
the abortion is displayed only after the command has been completed.
|
|
|
|
*** C++ support
|
|
|
|
gdb/931: GDB could be more generous when reading types C++ templates on input
|
|
|
|
When the user types a template, GDB frequently requires the type to be
|
|
typed in a certain way (e.g. "const char*" as opposed to "const char *"
|
|
or "char const *" or "char const*").
|
|
|
|
gdb/1512: no canonical way to output names of C++ types
|
|
|
|
We currently don't have any canonical way to output names of C++ types.
|
|
E.g. "const char *" versus "char const *"; more subtleties arise when
|
|
dealing with templates.
|
|
|
|
gdb/1516: [regression] local classes, gcc 2.95.3, dwarf-2
|
|
|
|
With gcc 2.95.3 and the dwarf-2 debugging format, classes which are
|
|
defined locally to a function include the demangled name of the function
|
|
as part of their name. For example, if a function "foobar" contains a
|
|
local class definition "Local", gdb will say that the name of the class
|
|
type is "foobar__Fi.0:Local".
|
|
|
|
This applies only to classes where the class type is defined inside a
|
|
function, not to variables defined with types that are defined somewhere
|
|
outside any function (which most types are).
|
|
|
|
gdb/1588: names of c++ nested types in casts must be enclosed in quotes
|
|
|
|
You must type
|
|
(gdb) print ('Foo::Bar') x
|
|
or
|
|
(gdb) print ('Foo::Bar' *) y
|
|
instead of
|
|
(gdb) print (Foo::Bar) x
|
|
or
|
|
(gdb) print (Foo::Bar *) y
|
|
respectively.
|
|
|
|
gdb/1091: Constructor breakpoints ignored
|
|
gdb/1193: g++ 3.3 creates multiple constructors: gdb 5.3 can't set breakpoints
|
|
|
|
When gcc 3.x compiles a C++ constructor or C++ destructor, it generates
|
|
2 or 3 different versions of the object code. These versions have
|
|
unique mangled names (they have to, in order for linking to work), but
|
|
they have identical source code names, which leads to a great deal of
|
|
confusion. Specifically, if you set a breakpoint in a constructor or a
|
|
destructor, gdb will put a breakpoint in one of the versions, but your
|
|
program may execute the other version. This makes it impossible to set
|
|
breakpoints reliably in constructors or destructors.
|
|
|
|
gcc 3.x generates these multiple object code functions in order to
|
|
implement virtual base classes. gcc 2.x generated just one object code
|
|
function with a hidden parameter, but gcc 3.x conforms to a multi-vendor
|
|
ABI for C++ which requires multiple object code functions.
|
|
|
|
*** Signal handlers
|
|
|
|
On many systems an attempt to single-step a system-call instruction
|
|
results in two or more instructions being executed (the system-call,
|
|
and one or more instructions following).
|
|
|
|
When attempting to single-step through a signal trampoline, this
|
|
problem may result the program unintentionally running to completion,
|
|
or re-execute the faulting instruction, or even corrupting the program
|
|
counter.
|
|
|
|
Ref: PR breakpoints/1702.
|
|
|
|
*** Stack backtraces
|
|
|
|
GDB's core code base has been updated to use a new backtrace
|
|
mechanism. This mechanism makes it possible to support new features
|
|
such DWARF 2 Call Frame Information (which in turn makes possible
|
|
backtraces through optimized code).
|
|
|
|
Since this code is new, it is known to still have a few problems:
|
|
|
|
gdb/1505: [regression] gdb prints a bad backtrace for a thread
|
|
|
|
When backtracing a thread, gdb does not stop when it reaches the
|
|
outermost frame, instead continuing until it hits garbage. This is
|
|
sensitive to the operating system and thread library.
|
|
|
|
hppa*-*-*
|
|
mips*-*-*
|
|
|
|
The MIPS and HPPA backtrace code has only very recently been updated
|
|
to use GDB's new frame mechanism. At present there are still a few
|
|
problems, in particular backtraces through signal handlers do not
|
|
work.
|
|
|
|
People encountering problems with these architectures should consult
|
|
GDB's web pages and mailing lists (http://www.gnu.org/software/gdb/)
|
|
to see if there are updates.
|
|
|
|
powerpc*-*-*
|
|
|
|
PowerPC architecture support, in 6.1, does not use the new frame code.
|
|
|
|
Fortunately, PowerPC architecture support, in GDB's mainline sources,
|
|
have been updated. People encountering problems should consider
|
|
downloading a more current snapshot of GDB
|
|
(http://www.gnu.org/software/gdb/current/).
|