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The package gnat-gdb contains GDB 5.3 with patches from Ada Core
Technologies. These patches make GDB Ada-aware, in addition to the
other languages already supported by GDB. The user's guide (in
package gnat-gdb-doc) provides details on this support for Ada.
It is also possible to use the regular GDB to debug Ada programs; the
Ada-aware GDB only provides some additional support.
Starting with GCC 3.4, the default format for debugging information
changed from STABS to DWARF2. This implies that Ada programs compiled
with gnat-3.4 will use DWARF2 by default. GDB 5.3 does not support
this format; if you want to use it to debug Ada programs compiled with
gnat-3.4, you must pass the option -gstabs+ to gcc when compiling.
This causes GCC to use the older format for debugging information.
For example:
$ gnatmake -g -gstabs+ program
$ gnatgdb program
The Ada compilers in packages gnat, gnat-3.2 and gnat-3.3 work out of
the box without the need for -gstabs+.
GDB 5.3 also does not support the New POSIX Thread Library (NPTL),
which is enabled by default on linux >= 2.6 and glibc >= 2.3. If you
have such a system, you must disable NPTL by setting the environment
variable LD_ASSUME_KERNEL to a value such as 2.4.1. For example:
$ gnatmake -g program
$ LD_ASSUME_KERNEL=2.4.1 gnatgdb program
--
Ludovic Brenta, Sun, 3 Oct 2004 19:37:27 +0200.
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