| |
| Known problems in GDB 6.1 |
| |
| See also: http://www.gnu.org/software/gdb/bugs/ |
| |
| |
| *** Build problems |
| |
| build/1458: comple failed on hpux11 |
| |
| GDB 6.1 is known to have build problems on HP/UX 11.00 using the |
| vendor supplied compilers (GDB does build on HP/UX 11.11, and using |
| GCC). |
| |
| *** 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. |
| |
| *** 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/). |