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Diffstat (limited to 'm4/pdns_relro.m4')
| -rw-r--r-- | m4/pdns_relro.m4 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/m4/pdns_relro.m4 b/m4/pdns_relro.m4 new file mode 100644 index 0000000..4f93629 --- /dev/null +++ b/m4/pdns_relro.m4 @@ -0,0 +1,37 @@ +dnl +dnl Check for -z now and -z relro linker flags +dnl +dnl Copyright (C) 2013 Red Hat, 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, see +dnl <http://www.gnu.org/licenses/>. +dnl + +AC_DEFUN([AC_LD_RELRO],[ + AC_MSG_CHECKING([for how to force completely read-only GOT table]) + + RELRO_LDFLAGS= + ld_help=`$CXX -Wl,-help 2>&1` + case $ld_help in + *"-z relro"*) RELRO_LDFLAGS="-Wl,-z -Wl,relro" ;; + esac + case $ld_help in + *"-z now"*) RELRO_LDFLAGS="$RELRO_LDFLAGS -Wl,-z -Wl,now" ;; + esac + AC_SUBST([RELRO_LDFLAGS]) + AS_IF([test "x$RELRO_LDFLAGS" != "x"], + [AC_MSG_RESULT([$RELRO_LDFLAGS])], + [AC_MSG_RESULT([unknown])] + ) +]) |