2009-09-03 Magnus Granberg <zorry@ume.nu>

* aclocal.m4: Add grub_CHECK_PIE. It check if the compiler
        include -fPIE in the default specs.
        * configure.ac: Check if pie_possible is yes and add -fno-PIE
        to TARGET_CFLAGS.

ChangeLog

@@ -1,3 +1,10 @@
+2009-09-03  Magnus Granberg  <zorry@ume.nu>
+
+	* aclocal.m4: Add grub_CHECK_PIE. It check if the compiler
+	include -fPIE in the default specs.
+	* configure.ac: Check if pie_possible is yes and add -fno-PIE
+	to TARGET_CFLAGS.
+
 2009-09-03  Felix Zielcke  <fzielcke@z-51.de>
 
 	* INSTALL: Note that GNU Bison 2.3 or later is required.

aclocal.m4

@@ -413,3 +413,31 @@ else
 [fi
 rm -rf testdir]
 ])
+
+dnl Check if the C compiler supports `-fPIE'.
+AC_DEFUN(grub_CHECK_PIE,[
+[# Position independent executable.
+pie_possible=yes]
+AC_MSG_CHECKING([whether `$CC' has `-fPIE' as default])
+# Is this a reliable test case?
+AC_LANG_CONFTEST([[
+#ifdef __PIE__
+int main() {
+	return 0;
+}
+#else
+#error NO __PIE__ DEFINED
+#endif
+]])
+
+[# `$CC -c -o ...' might not be portable.  But, oh, well...  Is calling
+# `ac_compile' like this correct, after all?
+if eval "$ac_compile -S -o conftest.s" 2> /dev/null; then]
+  AC_MSG_RESULT([yes])
+  [# Should we clear up other files as well, having called `AC_LANG_CONFTEST'?
+  rm -f conftest.s
+else
+  pie_possible=no]
+  AC_MSG_RESULT([no])
+[fi]
+])

configure.ac

@@ -346,6 +346,14 @@ fi
 # Need __enable_execute_stack() for nested function trampolines?
 grub_CHECK_ENABLE_EXECUTE_STACK
 
+# Position independent executable.
+grub_CHECK_PIE
+[# Need that, because some distributions ship compilers that include
+# `-fPIE' in the default specs.
+if [ x"$pie_possible" = xyes ]; then
+  TARGET_CFLAGS="$TARGET_CFLAGS -fno-PIE"
+fi]
+
 # Smashing stack protector.
 grub_CHECK_STACK_PROTECTOR
 # Need that, because some distributions ship compilers that include