152 lines
5.2 KiB
Text
152 lines
5.2 KiB
Text
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Known problems in GDB 6.2
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See also: http://www.gnu.org/software/gdb/bugs/
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*** Build problems
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build/1411: build fails on hpux 10.20 and hpux 11.00 with CMA threads
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GDB does not build on HP/UX 10.20 or HP/UX 11.00 if the CMA
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thread package is installed. The compile error is:
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../../gdb/hpux-thread.c:222: variable-size type declared outside of any function
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This happens only if the CMA thread package is installed.
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As a workaround, you can disable support for CMA threads
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by editing the file gdb/configure. Find the line:
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if test -f /usr/include/dce/cma_config.h ; then
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And replace it with:
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if false ; then
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build/1458: compile failed on hpux11
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GDB has build problems on HP/UX 11 with some versions of the HP
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Ansi C compiler. (GCC works fine).
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The problem happens when compiling intl/bindtextdom.c.
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The error is:
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cc: "gettextP.h", line 50: error 1000: Unexpected symbol: "SWAP".
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cc: panic 2017: Cannot recover from earlier errors, terminating.
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*** Error exit code 1
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This is a problem with the 'inline' keyword in gettextP.h.
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The workaround is to disable 'inline' before building gdb:
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export ac_cv_c_inline=no
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This problem happens only with some versions of the HP Ansi C compiler.
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Versions A.11.01.25171.GP and B.11.11.28706.GP have both been observed
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to work; version B.11.11.04 gets the build error and needs the
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workaround.
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This problem might also happen with other C compilers.
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*** Misc
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gdb/1560: Control-C does not always interrupt GDB.
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When GDB is busy processing a command which takes a long time to
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complete, hitting Control-C does not have the expected effect.
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The command execution is not aborted, and the "QUIT" message confirming
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the abortion is displayed only after the command has been completed.
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*** C++ support
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gdb/931: GDB could be more generous when reading types C++ templates on input
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When the user types a template, GDB frequently requires the type to be
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typed in a certain way (e.g. "const char*" as opposed to "const char *"
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or "char const *" or "char const*").
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gdb/1512: no canonical way to output names of C++ types
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We currently don't have any canonical way to output names of C++ types.
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E.g. "const char *" versus "char const *"; more subtleties arise when
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dealing with templates.
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gdb/1516: [regression] local classes, gcc 2.95.3, dwarf-2
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With gcc 2.95.3 and the dwarf-2 debugging format, classes which are
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defined locally to a function include the demangled name of the function
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as part of their name. For example, if a function "foobar" contains a
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local class definition "Local", gdb will say that the name of the class
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type is "foobar__Fi.0:Local".
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This applies only to classes where the class type is defined inside a
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function, not to variables defined with types that are defined somewhere
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outside any function (which most types are).
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gdb/1588: names of c++ nested types in casts must be enclosed in quotes
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You must type
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(gdb) print ('Foo::Bar') x
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or
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(gdb) print ('Foo::Bar' *) y
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instead of
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(gdb) print (Foo::Bar) x
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or
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(gdb) print (Foo::Bar *) y
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respectively.
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gdb/1091: Constructor breakpoints ignored
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gdb/1193: g++ 3.3 creates multiple constructors: gdb 5.3 can't set breakpoints
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When gcc 3.x compiles a C++ constructor or C++ destructor, it generates
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2 or 3 different versions of the object code. These versions have
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unique mangled names (they have to, in order for linking to work), but
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they have identical source code names, which leads to a great deal of
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confusion. Specifically, if you set a breakpoint in a constructor or a
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destructor, gdb will put a breakpoint in one of the versions, but your
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program may execute the other version. This makes it impossible to set
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breakpoints reliably in constructors or destructors.
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gcc 3.x generates these multiple object code functions in order to
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implement virtual base classes. gcc 2.x generated just one object code
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function with a hidden parameter, but gcc 3.x conforms to a multi-vendor
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ABI for C++ which requires multiple object code functions.
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*** Signal handlers
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On many systems an attempt to single-step a system-call instruction
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results in two or more instructions being executed (the system-call,
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and one or more instructions following).
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When attempting to single-step through a signal trampoline, this
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problem may result the program unintentionally running to completion,
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or re-execute the faulting instruction, or even corrupting the program
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counter.
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Ref: PR breakpoints/1702.
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*** Stack backtraces
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GDB's core code base has been updated to use a new backtrace
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mechanism. This mechanism makes it possible to support new features
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such DWARF 2 Call Frame Information (which in turn makes possible
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backtraces through optimized code).
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Since this code is new, it is known to still have a few problems:
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gdb/1505: [regression] gdb prints a bad backtrace for a thread
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When backtracing a thread, gdb does not stop when it reaches the
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outermost frame, instead continuing until it hits garbage. This is
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sensitive to the operating system and thread library.
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*** Threads
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threads/1650: manythreads.exp
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On GNU/Linux systems that use the old LinuxThreads thread library, a
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program rapidly creating and deleting threads can confuse GDB leading
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to an internal error.
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This problem does not occur on newer systems that use the NPTL
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library, and did not occur with GDB 6.1.
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