Make the huge_val test run a C++ program not C


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31422 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index 6699d67..7240657 100755
--- a/configure
+++ b/configure
@@ -29183,13 +29183,13 @@
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
 
-    ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
+    ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
-    CPPFLAGS=-pedantic
+    CXXFLAGS=-pedantic
     if test "$cross_compiling" = yes; then
   ac_cv_huge_val_sanity=yes
 else