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1 dnl Copyright (C) 2013 Xiph.org Foundation
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2 dnl
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3 dnl Redistribution and use in source and binary forms, with or without
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4 dnl modification, are permitted provided that the following conditions
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5 dnl are met:
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6 dnl
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7 dnl - Redistributions of source code must retain the above copyright
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8 dnl notice, this list of conditions and the following disclaimer.
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9 dnl
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10 dnl - Redistributions in binary form must reproduce the above copyright
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11 dnl notice, this list of conditions and the following disclaimer in the
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12 dnl documentation and/or other materials provided with the distribution.
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13 dnl
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14 dnl - Neither the name of the Xiph.org Foundation nor the names of its
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15 dnl contributors may be used to endorse or promote products derived from
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16 dnl this software without specific prior written permission.
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17 dnl
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18 dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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19 dnl ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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20 dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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21 dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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22 dnl CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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23 dnl EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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24 dnl PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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25 dnl PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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26 dnl LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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27 dnl NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 dnl SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29
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30 dnl Want to know of GCC stack protector works, botfor the C and for the C++
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31 dnl compiler.
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32 dnl
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33 dnl Just checking if the compiler accepts the required CFLAGSs is not enough
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34 dnl because we have seen at least one instance where this check was
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35 dnl in-sufficient.
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36 dnl
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37 dnl Instead, try to compile and link a test program with the stack protector
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38 dnl flags. If that works, we use it.
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39
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40 AC_DEFUN([XIPH_GCC_STACK_PROTECTOR],
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41 [AC_LANG_ASSERT(C)
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42 AC_MSG_CHECKING([if $CC supports stack smash protection])
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43 xiph_stack_check_old_cflags="$CFLAGS"
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44 SSP_FLAGS="-fstack-protector --param ssp-buffer-size=4"
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45 CFLAGS=$SSP_FLAGS
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46 AC_TRY_LINK([
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47 #include <stdio.h>
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48 ],
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49 [puts("Hello, World!"); return 0;],
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50 AC_MSG_RESULT([yes])
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51 CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS",
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52 AC_MSG_RESULT([no])
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53 CFLAGS="$xiph_stack_check_old_cflags"
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54 )
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55 ])# XIPH_GCC_STACK_PROTECTOR
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56
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57 AC_DEFUN([XIPH_GXX_STACK_PROTECTOR],
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58 [AC_LANG_PUSH([C++])
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59 AC_MSG_CHECKING([if $CXX supports stack smash protection])
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60 xiph_stack_check_old_cflags="$CFLAGS"
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61 SSP_FLAGS="-fstack-protector --param ssp-buffer-size=4"
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62 CFLAGS=$SSP_FLAGS
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63 AC_TRY_LINK([
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64 #include <cstdio>
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65 ],
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66 [puts("Hello, World!"); return 0;],
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67 AC_MSG_RESULT([yes])
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68 CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS",
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69 AC_MSG_RESULT([no])
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70 CFLAGS="$xiph_stack_check_old_cflags"
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71 )
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72 AC_LANG_POP([C++])
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73 ])# XIPH_GXX_STACK_PROTECTOR
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