re PR c++/49756 (g++ ICE)

	PR c++/49756
	* libiberty.h (stack_limit_increase): New prototype.

	* stack-limit.c: New file.
	* Makefile.in: Regenerate deps.
	(CFILES): Add stack-limit.c.
	(REQUIRED_OFILES): Add ./stack-limit.$(objext).
	* configure.ac (checkfuncs): Add getrlimit and setrlimit.
	(AC_CHECK_FUNCS): Likewise.
	* configure: Regenerated.
	* config.in: Regenerated.

	* gcc.c (main): Call stack_limit_increase (64MB).
	* toplev.c (toplev_main): Likewise.

From-SVN: r176622

diff --git a/libiberty/stack-limit.c b/libiberty/stack-limit.c
new file mode 100644 (file)
index 0000000..28541b1
--- /dev/null
+++ b/libiberty/stack-limit.c
@@ -0,0 +1,59 @@
+/* Increase stack size limit if possible.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+This file is part of the libiberty library.  This library is free
+software; you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.
+
+As a special exception, if you link this library with files
+compiled with a GNU compiler to produce an executable, this does not cause
+the resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why
+the executable file might be covered by the GNU General Public License. */
+
+/*
+
+@deftypefn Extension void stack_limit_increase (unsigned long @var{pref})
+
+Attempt to increase stack size limit to @var{pref} bytes if possible.
+
+@end deftypefn
+
+*/
+
+#include "config.h"
+
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+
+void
+stack_limit_increase (unsigned long pref)
+{
+#if defined(HAVE_SETRLIMIT) && defined(HAVE_GETRLIMIT) \
+    && defined(RLIMIT_STACK) && defined(RLIM_INFINITY)
+  struct rlimit rlim;
+  if (getrlimit (RLIMIT_STACK, &rlim) == 0
+      && rlim.rlim_cur != RLIM_INFINITY
+      && rlim.rlim_cur < pref
+      && (rlim.rlim_max == RLIM_INFINITY || rlim.rlim_cur < rlim.rlim_max))
+    {
+      rlim.rlim_cur = pref;
+      if (rlim.rlim_max != RLIM_INFINITY && rlim.rlim_cur > rlim.rlim_max)
+       rlim.rlim_cur = rlim.rlim_max;
+      setrlimit (RLIMIT_STACK, &rlim);
+    }
+#endif
+}