2016-12-05 10:57:47 +03:00
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dnl Copyright (C) 2013-2016 Xiph.org Foundation
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2013-03-13 11:58:16 +04:00
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dnl
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dnl Redistribution and use in source and binary forms, with or without
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dnl modification, are permitted provided that the following conditions
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dnl are met:
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dnl
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dnl - Redistributions of source code must retain the above copyright
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dnl notice, this list of conditions and the following disclaimer.
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dnl
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dnl - Redistributions in binary form must reproduce the above copyright
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dnl notice, this list of conditions and the following disclaimer in the
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dnl documentation and/or other materials provided with the distribution.
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dnl
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dnl - Neither the name of the Xiph.org Foundation nor the names of its
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dnl contributors may be used to endorse or promote products derived from
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dnl this software without specific prior written permission.
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dnl
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dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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dnl ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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dnl CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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dnl EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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dnl PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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dnl PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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dnl LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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dnl NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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dnl SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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dnl Want to know of GCC stack protector works, botfor the C and for the C++
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dnl compiler.
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dnl
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dnl Just checking if the compiler accepts the required CFLAGSs is not enough
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dnl because we have seen at least one instance where this check was
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dnl in-sufficient.
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dnl
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dnl Instead, try to compile and link a test program with the stack protector
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dnl flags. If that works, we use it.
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AC_DEFUN([XIPH_GCC_STACK_PROTECTOR],
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[AC_LANG_ASSERT(C)
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AC_MSG_CHECKING([if $CC supports stack smash protection])
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xiph_stack_check_old_cflags="$CFLAGS"
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SSP_FLAGS="-fstack-protector --param ssp-buffer-size=4"
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CFLAGS=$SSP_FLAGS
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AC_TRY_LINK([
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#include <stdio.h>
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],
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[puts("Hello, World!"); return 0;],
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AC_MSG_RESULT([yes])
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CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS",
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AC_MSG_RESULT([no])
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CFLAGS="$xiph_stack_check_old_cflags"
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)
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])# XIPH_GCC_STACK_PROTECTOR
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AC_DEFUN([XIPH_GXX_STACK_PROTECTOR],
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[AC_LANG_PUSH([C++])
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AC_MSG_CHECKING([if $CXX supports stack smash protection])
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xiph_stack_check_old_cflags="$CFLAGS"
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SSP_FLAGS="-fstack-protector --param ssp-buffer-size=4"
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CFLAGS=$SSP_FLAGS
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AC_TRY_LINK([
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#include <cstdio>
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],
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[puts("Hello, World!"); return 0;],
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AC_MSG_RESULT([yes])
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CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS",
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AC_MSG_RESULT([no])
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CFLAGS="$xiph_stack_check_old_cflags"
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)
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AC_LANG_POP([C++])
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])# XIPH_GXX_STACK_PROTECTOR
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