diff options
Diffstat (limited to 'm4/noexecstack.m4')
| -rw-r--r-- | m4/noexecstack.m4 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/m4/noexecstack.m4 b/m4/noexecstack.m4 new file mode 100644 index 00000000..629e3513 --- /dev/null +++ b/m4/noexecstack.m4 @@ -0,0 +1,55 @@ +# noexecstack.m4 +dnl Copyright (C) 1995-2006 Free Software Foundation, Inc. +dnl +dnl This library is free software; you can redistribute it and/or +dnl modify it under the terms of the GNU Lesser General Public +dnl License as published by the Free Software Foundation; either +dnl version 2.1 of the License, or (at your option) any later version. +dnl +dnl This library is distributed in the hope that it will be useful, +dnl but WITHOUT ANY WARRANTY; without even the implied warranty of +dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +dnl Lesser General Public License for more details. +dnl +dnl You should have received a copy of the GNU Lesser General Public +dnl License along with this library; if not, write to the Free Software +dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +dnl Checks whether the stack can be marked nonexecutable by passing an +dnl option to the C-compiler when acting on .s files. Returns that +dnl option in NOEXECSTACK_FLAGS. +dnl This macro is adapted from one found in GLIBC-2.3.5. +AC_DEFUN([CL_AS_NOEXECSTACK],[ +AC_REQUIRE([AC_PROG_CC]) +AC_REQUIRE([AM_PROG_AS]) + +AC_MSG_CHECKING([whether non excutable stack support is requested]) +AC_ARG_ENABLE(noexecstack, + AC_HELP_STRING([--enable-noexecstack], + [enable non executable stack support (gcc only)]), + noexecstack_support=$enableval, noexecstack_support=no) +AC_MSG_RESULT($noexecstack_support) + +AC_CACHE_CHECK([whether assembler supports --noexecstack option], +cl_cv_as_noexecstack, [dnl + cat > conftest.c <<EOF +void foo() {} +EOF + if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS + -S -o conftest.s conftest.c >/dev/null]) \ + && grep -q .note.GNU-stack conftest.s \ + && AC_TRY_COMMAND([${CCAS} $CCASFLAGS $CPPFLAGS -Wa,--noexecstack + -c -o conftest.o conftest.s >/dev/null]) + then + cl_cv_as_noexecstack=yes + else + cl_cv_as_noexecstack=no + fi + rm -f conftest*]) + if test "$noexecstack_support" = yes -a "$cl_cv_as_noexecstack" = yes; then + NOEXECSTACK_FLAGS="-Wa,--noexecstack" + else + NOEXECSTACK_FLAGS= + fi + AC_SUBST(NOEXECSTACK_FLAGS) +]) |