1 files changed, 55 insertions, 0 deletions
diff --git a/m4/pdns_pie.m4 b/m4/pdns_pie.m4
new file mode 100644
index 0000000..98d3923
--- /dev/null
+++ b/m4/pdns_pie.m4
@@ -0,0 +1,55 @@
+dnl
+dnl Check for support for position independent executables
+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_CC_PIE],[
+    AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS])
+    PIE_CFLAGS=
+    PIE_LDFLAGS=
+    OLD_CXXFLAGS=$CXXFLAGS
+    case "$host" in
+      *-*-mingw* | *-*-msvc* | *-*-cygwin* )
+         ;; dnl All code is position independent on Win32 target
+      *)
+        CXXFLAGS="-fPIE -DPIE"
+        gl_COMPILER_OPTION_IF([-pie], [
+          PIE_CFLAGS="-fPIE -DPIE"
+          PIE_LDFLAGS="-pie"
+          ], [
+            dnl some versions of clang require -Wl,-pie instead of -pie
+            gl_COMPILER_OPTION_IF([[-Wl,-pie]], [
+              PIE_CFLAGS="-fPIE -DPIE"
+              PIE_LDFLAGS="-Wl,-pie"
+              ], [],
+              [AC_LANG_PROGRAM([[
+#include <pthread.h>
+__thread unsigned int t_id;
+                ]], [[t_id = 1;]])]
+            )
+          ],
+          [AC_LANG_PROGRAM([[
+#include <pthread.h>
+__thread unsigned int t_id;
+            ]], [[t_id = 1;]])]
+        )
+    esac
+    CXXFLAGS=$OLD_CXXFLAGS
+    AC_SUBST([PIE_CFLAGS])
+    AC_SUBST([PIE_LDFLAGS])
+])