2.69: missing "checking for C++ compiler"

[Akim Demaille]

When CXX is specified, configure does not report that
it is looking for a C++ compiler, nor its answer.

$ cat configure.ac
AC_INIT
AC_PROG_CC
AC_PROG_CXX
$ autoconf
$ diff -U 100 =(./configure) =(./configure CC=gcc CXX=g++)
--- /tmp/zshIZDChp      2012-10-26 13:39:32.000000000 +0200
+++ /tmp/zshIxgQgH      2012-10-26 13:39:33.000000000 +0200
@@ -1,12 +1,11 @@
 checking for gcc... gcc
 checking whether the C compiler works... yes
 checking for C compiler default output file name... a.out
 checking for suffix of executables... 
 checking whether we are cross compiling... no
 checking for suffix of object files... o
 checking whether we are using the GNU C compiler... yes
 checking whether gcc accepts -g... yes
 checking for gcc option to accept ISO C89... none needed
-checking for g++... g++
 checking whether we are using the GNU C++ compiler... yes
 checking whether g++ accepts -g... yes


FWIW, I think configure should say "checking for a C++ compiler",
"checking for a C compiler" instead of "checking for gcc".