diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 38b6078..531f72b 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -568,7 +568,7 @@
 [llvm_cv_llvmgcc_sanity="no"
 if test -x "$LLVMGCC" ; then
   cp /dev/null conftest.c
-  "$LLVMGCC" -S -o - conftest.c | grep implementation > /dev/null 2>&1
+  "$LLVMGCC" -emit-llvm -S -o - conftest.c | grep implementation > /dev/null 2>&1
   if test $? -eq 0 ; then
     llvm_cv_llvmgcc_sanity="yes"
   fi
diff --git a/configure b/configure
index 1a04edd..ec46bd3 100755
--- a/configure
+++ b/configure
@@ -30613,7 +30613,7 @@
   llvm_cv_llvmgcc_sanity="no"
 if test -x "$LLVMGCC" ; then
   cp /dev/null conftest.c
-  "$LLVMGCC" -S -o - conftest.c | grep implementation > /dev/null 2>&1
+  "$LLVMGCC" -emit-llvm -S -o - conftest.c | grep implementation > /dev/null 2>&1
   if test $? -eq 0 ; then
     llvm_cv_llvmgcc_sanity="yes"
   fi