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A user pointed out a problem when printing certain values from an Ada enumeration type. Investigation showed that the problem was that some enumeration constants were emitted using DW_FORM_data1, and were incorrectly sign-extended by gdb. First, this is yet another instance of a general problem with DWARF. See https://sourceware.org/bugzilla/show_bug.cgi?id=32680 for the analysis. Meanwhile, it turns out that GCC implements an extension to handle this scenario. In particular, in non-strict mode, it will emit DW_AT_encoding using either DW_ATE_signed or DW_ATE_unsigned. This was done back in 2017 by Pierre-Marie, in support of Ada -- but then somehow nothing was ever implemented on the gdb side. For this see GCC commit f76f096e ("DWARF: add DW_AT_encoding attributes for DW_TAG_enumeration_type DIEs"). This patch adds the missing code to gdb. The included test case shows the bug that was originally reported. I've also included the snippet from Pierre-Marie's commit message for good measure. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32680 Approved-By: Andrew Burgess <aburgess@redhat.com> |
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| gdb | ||
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| gdbsupport | ||
| gnulib | ||
| gold | ||
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| libdecnumber | ||
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| ar-lib | ||
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| MAINTAINERS | ||
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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, and so on. 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.