util: Add --disable-fault-handling.

On some platforms you can not debug coredumps after the default signal handler
gets done dumping core.  This allows waf to have an option to disable our
default signal handler.

lib/util/fault.c

@@ -96,6 +96,7 @@ void fault_setup(void)
 	if (fault_state.disabled) {
 		return;
 	}
+#if !defined(HAVE_DISABLE_FAULT_HANDLING)
 #ifdef SIGSEGV
 	CatchSignal(SIGSEGV, sig_fault);
 #endif
@@ -105,6 +106,7 @@ void fault_setup(void)
 #ifdef SIGABRT
 	CatchSignal(SIGABRT, sig_fault);
 #endif
+#endif
 }
 
 _PUBLIC_ const char *panic_action = NULL;

lib/util/wscript

@@ -0,0 +1,3 @@
+def set_options(opt):
+    ''' This is a bit strange, but disable is the flag, not enable. '''
+    opt.add_option('--disable-fault-handling', action='store_true', dest='disable_fault_handling', help=('disable the fault handlers'), default=False)

lib/util/wscript_configure

@@ -1,5 +1,8 @@
 #!/usr/bin/env python
+import Options
 
+if Options.options.disable_fault_handling:
+    conf.DEFINE('HAVE_DISABLE_FAULT_HANDLING',1)
 
 # backtrace could be in libexecinfo or in libc
 conf.CHECK_FUNCS_IN('backtrace backtrace_symbols', 'execinfo', checklibc=True, headers='execinfo.h')

source3/configure.in

@@ -6799,6 +6799,7 @@ if test x"$enable_pthreadpool" = x"yes" -a x"$samba_cv_HAVE_PTHREAD" = x"yes"; t
     fi
 fi
 
+
 #################################################
 # Check to see if we should use the included iniparser
 
@@ -6834,6 +6835,12 @@ AC_SUBST(BUILD_INIPARSER)
 AC_SUBST(INIPARSERLIBS)
 AC_SUBST(FLAGS1)
 
+AC_ARG_ENABLE(fault-handler,[AS_HELP_STRING([--disable-fault-handler], [Disable the default handler])])
+
+if test x"$enable_fault_handler" = x"no"; then
+	AC_DEFINE(HAVE_DISABLE_FAULT_HANDLER, 1, [Disable the default signal handler])
+fi
+
 ###################################################
 # Check for different/missing (set|get|end)netgrent prototypes
 CFLAGS_SAVE=$CFLAGS

wscript

@@ -30,6 +30,7 @@ def set_options(opt):
     opt.RECURSE('lib/uid_wrapper')
     opt.RECURSE('pidl')
     opt.RECURSE('source3')
+    opt.RECURSE('lib/util')
 
     gr = opt.option_group('developer options')
     gr.add_option('--enable-build-farm',