| 1 | # Check prerequisites for compiling lib/c-stack.c.
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| 2 |
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| 3 | # Copyright (C) 2002 Free Software Foundation, Inc.
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| 4 |
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| 5 | # This program is free software; you can redistribute it and/or modify
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| 6 | # it under the terms of the GNU General Public License as published by
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| 7 | # the Free Software Foundation; either version 2, or (at your option)
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| 8 | # any later version.
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| 9 |
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| 10 | # This program is distributed in the hope that it will be useful,
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| 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | # GNU General Public License for more details.
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| 14 |
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| 15 | # You should have received a copy of the GNU General Public License
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| 16 | # along with this program; if not, write to the Free Software
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| 17 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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| 18 | # 02111-1307, USA.
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| 19 |
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| 20 | AC_DEFUN([AC_SYS_XSI_STACK_OVERFLOW_HEURISTIC],
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| 21 | [# for STACK_DIRECTION
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| 22 | AC_REQUIRE([AC_FUNC_ALLOCA])
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| 23 |
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| 24 | AC_CACHE_CHECK([for working C stack overflow detection],
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| 25 | ac_cv_sys_xsi_stack_overflow_heuristic,
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| 26 | [AC_TRY_RUN(
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| 27 | [
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| 28 | #include <signal.h>
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| 29 | #include <ucontext.h>
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| 30 |
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| 31 | static union
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