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- dnl Copyright (C) 2013-2023 Xiph.Org Foundation
- dnl
- dnl Redistribution and use in source and binary forms, with or without
- dnl modification, are permitted provided that the following conditions
- dnl are met:
- dnl
- dnl - Redistributions of source code must retain the above copyright
- dnl notice, this list of conditions and the following disclaimer.
- dnl
- dnl - Redistributions in binary form must reproduce the above copyright
- dnl notice, this list of conditions and the following disclaimer in the
- dnl documentation and/or other materials provided with the distribution.
- dnl
- dnl - Neither the name of the Xiph.org Foundation nor the names of its
- dnl contributors may be used to endorse or promote products derived from
- dnl this software without specific prior written permission.
- dnl
- dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- dnl ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
- dnl CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- dnl EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- dnl PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- dnl PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- dnl LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- dnl NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- dnl SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- dnl We want to know if GCC stack protector works, for the C and for the C++
- dnl compiler.
- dnl
- dnl Just checking if the compiler accepts the required CFLAGSs is not enough
- dnl because we have seen at least one instance where this check was
- dnl in-sufficient.
- dnl
- dnl Instead, try to compile and link a test program with the stack protector
- dnl flags. If that works, we use it.
- AC_DEFUN([XIPH_GCC_STACK_PROTECTOR],
- [AC_LANG_ASSERT(C)
- AC_MSG_CHECKING([if $CC supports stack smash protection])
- xiph_stack_check_old_cflags="$CFLAGS"
- SSP_FLAGS="-fstack-protector-strong"
- CFLAGS=$SSP_FLAGS
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[
- #include <stdio.h>
- ]], [[puts("Hello, World!"); return 0;]])],[AC_MSG_RESULT(yes)
- CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS"],[AC_MSG_RESULT(no)
- CFLAGS="$xiph_stack_check_old_cflags"
- ])
- ])# XIPH_GCC_STACK_PROTECTOR
- AC_DEFUN([XIPH_GXX_STACK_PROTECTOR],
- [AC_LANG_PUSH([C++])
- AC_MSG_CHECKING([if $CXX supports stack smash protection])
- xiph_stack_check_old_cxxflags="$CXXFLAGS"
- SSP_FLAGS="-fstack-protector-strong"
- CXXFLAGS=$SSP_FLAGS
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[
- #include <cstdio>
- ]], [[puts("Hello, World!"); return 0;]])],[AC_MSG_RESULT(yes)
- CXXFLAGS="$xiph_stack_check_old_cxxflags $SSP_FLAGS"],[AC_MSG_RESULT(no)
- CXXFLAGS="$xiph_stack_check_old_cxxflags"
- ])
- AC_LANG_POP([C++])
- ])# XIPH_GXX_STACK_PROTECTOR
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