It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/m4/link_use_r.m4 b/autoconf/m4/link_use_r.m4
new file mode 100644
index 0000000..30c964e
--- /dev/null
+++ b/autoconf/m4/link_use_r.m4
@@ -0,0 +1,19 @@
+#
+# Determine if the system can handle the -R option being passed to the linker.
+#
+# This macro is specific to LLVM.
+#
+AC_DEFUN([AC_LINK_USE_R],
+[AC_CACHE_CHECK([for compiler -Wl,-R<path> option],[llvm_cv_link_use_r],
+[ AC_LANG_PUSH([C])
+ oldcflags="$CFLAGS"
+ CFLAGS="$CFLAGS -Wl,-R."
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])],
+ [llvm_cv_link_use_r=yes],[llvm_cv_link_use_r=no])
+ CFLAGS="$oldcflags"
+ AC_LANG_POP([C])
+])
+if test "$llvm_cv_link_use_r" = yes ; then
+ AC_DEFINE([HAVE_LINK_R],[1],[Define if you can use -Wl,-R. to pass -R. to the linker, in order to add the current directory to the dynamic linker search path.])
+ fi
+])