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While reading that code, I noticed that some variables essentially meant whether to consider some other variable or not. I think using gdb::optional (which was not available when this code was written) is clearer, as it embeds the used/not used predicate directly in the type of the variable, making it harder to miss. gdb/ChangeLog: * dwarf2read.c (struct dw2_symtab_iterator): <want_specific_block>: Remove. <block_index>: Change type to gdb::optional. (dw2_symtab_iter_init): Remove WANT_SPECIFIC_BLOCK parameter, change type of BLOCK_INDEX parameter to gdb::optional. (dw2_symtab_iter_next): Re-write in function of gdb::optional. (dw2_lookup_symbol): Don't pass argument for WANT_SPECIFIC_BLOCK. (dw2_expand_symtabs_for_function): Don't pass argument for WANT_SPECIFIC_BLOCK, pass empty optional for BLOCK_INDEX. (class dw2_debug_names_iterator) <dw2_debug_names_iterator>: Remove WANT_SPECIFIC_BLOCK parameter, change BLOCK_INDEX type to gdb::optional. <m_want_specific_block>: Remove. <m_block_index>: Change type to gdb::optional. (dw2_debug_names_iterator::next): Change type of IS_STATIC to gdb::optional. Re-write in function of gdb::optional. (dw2_debug_names_lookup_symbol): Don't pass argument for WANT_SPECIFIC_BLOCK. (dw2_debug_names_expand_symtabs_for_function): Don't pass argument for WANT_SPECIFIC_BLOCK, pass empty optional for BLOCK_INDEX.
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.