| Erik de Castro Lopo | 6b00dc2 | 2016-12-05 18:57:47 +1100 | [diff] [blame] | 1 | dnl Copyright (C) 2013-2016 Xiph.org Foundation |
| Erik de Castro Lopo | 195470f | 2013-03-13 18:58:16 +1100 | [diff] [blame] | 2 | dnl |
| 3 | dnl Redistribution and use in source and binary forms, with or without |
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| 14 | dnl - Neither the name of the Xiph.org Foundation nor the names of its |
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| NotTsunami | f706f28 | 2019-11-19 16:28:22 -0500 | [diff] [blame] | 30 | dnl We want to know if GCC stack protector works, for the C and for the C++ |
| Erik de Castro Lopo | 195470f | 2013-03-13 18:58:16 +1100 | [diff] [blame] | 31 | dnl compiler. |
| 32 | dnl |
| 33 | dnl Just checking if the compiler accepts the required CFLAGSs is not enough |
| 34 | dnl because we have seen at least one instance where this check was |
| 35 | dnl in-sufficient. |
| 36 | dnl |
| 37 | dnl Instead, try to compile and link a test program with the stack protector |
| 38 | dnl flags. If that works, we use it. |
| 39 | |
| 40 | AC_DEFUN([XIPH_GCC_STACK_PROTECTOR], |
| 41 | [AC_LANG_ASSERT(C) |
| 42 | AC_MSG_CHECKING([if $CC supports stack smash protection]) |
| 43 | xiph_stack_check_old_cflags="$CFLAGS" |
| NotTsunami | f706f28 | 2019-11-19 16:28:22 -0500 | [diff] [blame] | 44 | SSP_FLAGS="-fstack-protector-strong" |
| Erik de Castro Lopo | 195470f | 2013-03-13 18:58:16 +1100 | [diff] [blame] | 45 | CFLAGS=$SSP_FLAGS |
| 46 | AC_TRY_LINK([ |
| 47 | #include <stdio.h> |
| 48 | ], |
| 49 | [puts("Hello, World!"); return 0;], |
| 50 | AC_MSG_RESULT([yes]) |
| 51 | CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS", |
| 52 | AC_MSG_RESULT([no]) |
| 53 | CFLAGS="$xiph_stack_check_old_cflags" |
| 54 | ) |
| 55 | ])# XIPH_GCC_STACK_PROTECTOR |
| 56 | |
| 57 | AC_DEFUN([XIPH_GXX_STACK_PROTECTOR], |
| 58 | [AC_LANG_PUSH([C++]) |
| 59 | AC_MSG_CHECKING([if $CXX supports stack smash protection]) |
| 60 | xiph_stack_check_old_cflags="$CFLAGS" |
| NotTsunami | f706f28 | 2019-11-19 16:28:22 -0500 | [diff] [blame] | 61 | SSP_FLAGS="-fstack-protector-strong" |
| Erik de Castro Lopo | 195470f | 2013-03-13 18:58:16 +1100 | [diff] [blame] | 62 | CFLAGS=$SSP_FLAGS |
| 63 | AC_TRY_LINK([ |
| 64 | #include <cstdio> |
| 65 | ], |
| 66 | [puts("Hello, World!"); return 0;], |
| 67 | AC_MSG_RESULT([yes]) |
| 68 | CFLAGS="$xiph_stack_check_old_cflags $SSP_FLAGS", |
| 69 | AC_MSG_RESULT([no]) |
| 70 | CFLAGS="$xiph_stack_check_old_cflags" |
| 71 | ) |
| 72 | AC_LANG_POP([C++]) |
| 73 | ])# XIPH_GXX_STACK_PROTECTOR |