| 1 | |
| 2 | Known problems in GDB 6.3 |
| 3 | |
| 4 | See also: http://www.gnu.org/software/gdb/bugs/ |
| 5 | |
| 6 | |
| 7 | *** Build problems |
| 8 | |
| 9 | build/1411: build fails on hpux 10.20 and hpux 11.00 with CMA threads |
| 10 | |
| 11 | GDB does not build on HP/UX 10.20 or HP/UX 11.00 if the CMA |
| 12 | thread package is installed. The compile error is: |
| 13 | |
| 14 | ../../gdb/hpux-thread.c:222: variable-size type declared outside of any function |
| 15 | |
| 16 | This happens only if the CMA thread package is installed. |
| 17 | |
| 18 | As a workaround, you can disable support for CMA threads |
| 19 | by editing the file gdb/configure. Find the line: |
| 20 | |
| 21 | if test -f /usr/include/dce/cma_config.h ; then |
| 22 | |
| 23 | And replace it with: |
| 24 | |
| 25 | if false ; then |
| 26 | |
| 27 | *** Misc |
| 28 | |
| 29 | gdb/1560: Control-C does not always interrupt GDB. |
| 30 | |
| 31 | When GDB is busy processing a command which takes a long time to |
| 32 | complete, hitting Control-C does not have the expected effect. |
| 33 | The command execution is not aborted, and the "QUIT" message confirming |
| 34 | the abortion is displayed only after the command has been completed. |
| 35 | |
| 36 | *** C++ support |
| 37 | |
| 38 | gdb/931: GDB could be more generous when reading types C++ templates on input |
| 39 | |
| 40 | When the user types a template, GDB frequently requires the type to be |
| 41 | typed in a certain way (e.g. "const char*" as opposed to "const char *" |
| 42 | or "char const *" or "char const*"). |
| 43 | |
| 44 | gdb/1512: no canonical way to output names of C++ types |
| 45 | |
| 46 | We currently don't have any canonical way to output names of C++ types. |
| 47 | E.g. "const char *" versus "char const *"; more subtleties arise when |
| 48 | dealing with templates. |
| 49 | |
| 50 | gdb/1516: [regression] local classes, gcc 2.95.3, dwarf-2 |
| 51 | |
| 52 | With gcc 2.95.3 and the dwarf-2 debugging format, classes which are |
| 53 | defined locally to a function include the demangled name of the function |
| 54 | as part of their name. For example, if a function "foobar" contains a |
| 55 | local class definition "Local", gdb will say that the name of the class |
| 56 | type is "foobar__Fi.0:Local". |
| 57 | |
| 58 | This applies only to classes where the class type is defined inside a |
| 59 | function, not to variables defined with types that are defined somewhere |
| 60 | outside any function (which most types are). |
| 61 | |
| 62 | gdb/1588: names of c++ nested types in casts must be enclosed in quotes |
| 63 | |
| 64 | You must type |
| 65 | (gdb) print ('Foo::Bar') x |
| 66 | or |
| 67 | (gdb) print ('Foo::Bar' *) y |
| 68 | instead of |
| 69 | (gdb) print (Foo::Bar) x |
| 70 | or |
| 71 | (gdb) print (Foo::Bar *) y |
| 72 | respectively. |
| 73 | |
| 74 | gdb/1091: Constructor breakpoints ignored |
| 75 | gdb/1193: g++ 3.3 creates multiple constructors: gdb 5.3 can't set breakpoints |
| 76 | |
| 77 | When gcc 3.x compiles a C++ constructor or C++ destructor, it generates |
| 78 | 2 or 3 different versions of the object code. These versions have |
| 79 | unique mangled names (they have to, in order for linking to work), but |
| 80 | they have identical source code names, which leads to a great deal of |
| 81 | confusion. Specifically, if you set a breakpoint in a constructor or a |
| 82 | destructor, gdb will put a breakpoint in one of the versions, but your |
| 83 | program may execute the other version. This makes it impossible to set |
| 84 | breakpoints reliably in constructors or destructors. |
| 85 | |
| 86 | gcc 3.x generates these multiple object code functions in order to |
| 87 | implement virtual base classes. gcc 2.x generated just one object code |
| 88 | function with a hidden parameter, but gcc 3.x conforms to a multi-vendor |
| 89 | ABI for C++ which requires multiple object code functions. |
| 90 | |
| 91 | *** Threads |
| 92 | |
| 93 | threads/1650: manythreads.exp |
| 94 | |
| 95 | On GNU/Linux systems that use the old LinuxThreads thread library, a |
| 96 | program rapidly creating and deleting threads can confuse GDB leading |
| 97 | to an internal error. |
| 98 | |
| 99 | This problem does not occur on newer systems that use the NPTL |
| 100 | library, and did not occur with GDB 6.1. |