Re: AC_PROG_CXX_C_O

[Ralf Wildenhues]

* Ralf Wildenhues wrote on Sat, May 20, 2006 at 07:39:29AM CEST:
> * Paul Eggert wrote on Fri, May 19, 2006 at 11:33:51PM CEST:
> > That looks good to me[...]

> OK, applied[...]

And applied this followup patch (dummy me; the testsuite even exposes
this) to really make this macro work reasonably.  Sorry about that.

Cheers,
Ralf

        * lib/autoconf/c.m4 (AC_PROG_CXX_C_O): Require AC_PROG_CXX,
        and set the language to C++ (analogous to the equivalent Fortran
        tests).

Index: lib/autoconf/c.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/c.m4,v
retrieving revision 1.225
diff -u -r1.225 c.m4
--- lib/autoconf/c.m4   20 May 2006 05:39:03 -0000      1.225
+++ lib/autoconf/c.m4   20 May 2006 15:44:08 -0000
@@ -829,7 +829,8 @@
 # Test if the C++ compiler accepts the options `-c' and `-o'
 # simultaneously, and define `CXX_NO_MINUS_C_MINUS_O' if it does not.
 AC_DEFUN([AC_PROG_CXX_C_O],
-[AC_LANG_ASSERT([C++])dnl
+[AC_REQUIRE([AC_PROG_CXX])dnl
+AC_LANG_PUSH([C++])dnl
 AC_CACHE_CHECK([whether $CXX understands -c and -o together],
                [ac_cv_prog_cxx_c_o],
 [AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
@@ -850,6 +851,7 @@
             [Define to 1 if your C++ compiler doesn't accept
              -c and -o together.])
 fi
+AC_LANG_POP([C++])dnl
 ])# AC_PROG_CXX_C_O