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