[PATCH] Add multiple language testcase

[Paolo Bonzini]

Much to my surprise, the only testcase that tries using multiple
languages in the Autoconf testsuite is... the Libtool integration test!

And I'm not even sure it does with Libtool 2.x.

So, I'm pushing this one.

Paolo

2008-10-15  Paolo Bonzini  <address@hidden>

        * tests/compile.at (Multiple languages): New.

diff --git a/tests/compile.at b/tests/compile.at
index 715fde8..6ee22ae 100644
--- a/tests/compile.at
+++ b/tests/compile.at
@@ -150,3 +150,41 @@ AT_CHECK_MACRO([AC_TRY_LINK_FUNC],
                  [AC_MSG_ERROR([cannot find `printf'])])
 AC_TRY_LINK_FUNC(Be_doomed_if_your_libc_has_a_function_named_like_this,
                 [AC_MSG_ERROR([found a nonexistent function])])])
+
+## -------------------- ##
+## Multiple languages.  ##
+## -------------------- ##
+
+AT_SETUP([Multiple languages])
+
+AT_DATA([configure.ac],
+[[AC_INIT
+
+AC_PROG_CC
+AC_PROG_CXX
+
+AC_LANG_PUSH(C)
+AC_MSG_CHECKING([a simple C program that is not valid C++])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([enum a { A, B, C };
+                                   enum a f(enum a in) { return in++; }], [])],
+                 [AC_MSG_RESULT([ok])],
+                 [AC_MSG_RESULT([failed])
+                  AC_MSG_ERROR([could not compile test program])])
+AC_LANG_POP(C)
+
+AC_LANG_PUSH(C++)
+AC_MSG_CHECKING([a simple C++ program that is not valid C])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([class A {};], [])],
+                 [AC_MSG_RESULT([ok])],
+                 [AC_MSG_RESULT([failed])
+                  AC_MSG_ERROR([could not compile test program])])
+
+AC_CHECK_HEADER([cstring])
+AC_LANG_POP(C++)
+]])
+
+AT_CHECK_AUTOCONF
+AT_CHECK_CONFIGURE([-q])
+
+AT_CLEANUP
+