[gparted] Make ./configure fail when C++ compiler is missing (#732803)

[Curtis Gedak <gedakc src gnome org>]

commit b1c64fdf0d9008f7f619723c5b8a7f92f58254f6
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sun Jul 6 18:57:22 2014 +0100

    Make ./configure fail when C++ compiler is missing (#732803)
    
    Currently ./configure passes successfully even if a C++ compiler is not
    installed.  The first time building the code fails is when make tries
    to compile the first C++ source file and the compiler executable is not
    found.
    
    Also because there is no C++ compiler the autoconf generated test for
    Gtk::Window::set_default_icon_name() will always fail, leaving
    HAVE_SET_DEFAULT_ICON_NAME unset.  Therefore as well as installing a
    C++ compiler, ./configure must be run again to correctly test for
    set_default_icon_name().
    
    This is as a result of a little known consequence of having AC_PROG_CC
    proceed AC_PROG_CXX in the autoconf file configure.ac.
        Subject: AC_PROG_CXX behaviour when no C++ compiler is found
        http://lists.gnu.org/archive/html/bug-autoconf/2010-05/msg00001.html
    
    Reverse the order, placing AC_PROG_CXX before AC_PROG_CC, so that the
    generated ./configure script fails with an error if there is no C++
    compiler available.
    
    Bug #732803 - ./configure is successful even when C++ compile is missing

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6b3d672..5d31663 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,8 +12,8 @@ AM_MAINTAINER_MODE
 dnl======================
 dnl checks for programs
 dnl======================
-AC_PROG_CC
 AC_PROG_CXX
+AC_PROG_CC
 AM_PROG_LIBTOOL