AC_REQUIRE_CPP should fail with Fortran

[Pavel Roskin]

Hello!

The following configure.in tests C++ for no reason:

AC_INIT
AC_LANG(Fortran 77)
AC_CHECK_HEADER(unistd.h)
AC_OUTPUT

ChangeLog:
        * aclang.m4 (AC_REQUIRE_CPP): Don't default to C++ - call AC_FATAL
        for unsupported languages.

______________________
Index: aclang.m4
--- aclang.m4   Tue Oct 24 13:49:58 2000
+++ aclang.m4   Fri Oct 27 16:13:30 2000
@@ -512,7 +512,8 @@
 # current language.
 AC_DEFUN([AC_REQUIRE_CPP],
 [AC_LANG_CASE(C, [AC_REQUIRE([AC_PROG_CPP])],
-                 [AC_REQUIRE([AC_PROG_CXXCPP])])])
+              C++, [AC_REQUIRE([AC_PROG_CXXCPP])],
+              [AC_FATAL([No preprocessor defined for ]_AC_LANG)])])
 
 
 # _AC_LANG_COMPILER_WORKS
______________________

Regards,
Pavel Roskin