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The problem here is that if a thread other than gdb's main thread gets a SIGCHLD (it's an asynchronous signal so the kernel will essentially pick a random thread) then gdb will hang if it is in sigsuspend when the SIGCHLD is delivered. The other thread will see the signal and the sigsuspend won't "wake up". Guile and libgc should be blocking SIGCHLD in their threads, but we need to work with Guile 2.0 and libgc 7.4. The problem first shows up in libgc 7.4 because it is the first release that enables multiple marker threads by default. gdb/ChangeLog: PR 17247 * guile.c: #include <signal.h>. (_initialize_guile): Block SIGCHLD while initializing Guile. Replaces the following, which is reverted. 2014-07-26 Doug Evans <xdje42@gmail.com> PR 17185 * configure.ac: Add check for header gc/gc.h. Add check for function setenv. * configure: Regenerate. * config.in: Regenerate. * guile/guile.c (_initialize_guile): Add workaround for libgc 7.4.0.
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.