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The Ada varobj code automatically dereferences access types. This is often handy, but it also does so for null pointers -- showing children with empty values. These children are weird, but even weirder when a variant type is involved, because only the non-varying parts of the type are displayed. This behavior conflicts a bit with my ongoing quest to move the Ada code to use DWARF rather than gnat encodings, in that reproducing this behavior with the DWARF code seems rather hacky. So, this patch instead changes the Ada varobj code so that it does not automatically dereference null pointers. As this patch only affects Ada, and it was already reviewed internally by Joel, I am checking it in. 2020-09-02 Tom Tromey <tromey@adacore.com> * ada-varobj.c (ada_varobj_get_ptr_number_of_children): Return 0 for null pointers. (ada_varobj_adjust_for_child_access): Special-case null pointers. gdb/testsuite/ChangeLog 2020-09-02 Tom Tromey <tromey@adacore.com> * gdb.ada/mi_var_access.exp: Test children of access variable. * gdb.ada/mi_var_access/mi_access.adb: Add new stop markers. * gdb.ada/mi_var_array.exp: Update.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.