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authorDoug Evans <xdje42@gmail.com>2014-09-08 22:45:34 -0700
committerDoug Evans <xdje42@gmail.com>2014-09-08 22:45:34 -0700
commit92d8d229d9a310ebfcfc13bf4a75a286c1add1ac (patch)
treeb9ce9674fc04930b500d611e033bb5368c9d54a3 /gdb/configure.ac
parent837405970476d31d6b4d7774e2c914fdfa7a9930 (diff)
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Fix for PR 17247: Block SIGCHLD while initializing Guile.
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.
Diffstat (limited to 'gdb/configure.ac')
-rw-r--r--gdb/configure.ac5
1 files changed, 0 insertions, 5 deletions
diff --git a/gdb/configure.ac b/gdb/configure.ac
index 26c8ecf..ab7b1c2 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -1233,11 +1233,6 @@ AC_SUBST(GUILE_CPPFLAGS)
AC_SUBST(GUILE_LIBS)
AM_CONDITIONAL(HAVE_GUILE, test "${have_libguile}" != no)
-# PR 17185, see if we can get the libgc version to see if we need
-# to apply the workaround.
-AC_CHECK_HEADERS(gc/gc.h)
-AC_CHECK_FUNCS([setenv])
-
# --------------------- #
# Check for libmcheck. #
# --------------------- #