* Ensure to pass the C++ exceptions flags to the C and Fortran

compilers as well.   Not doing this was causing problems with
   MPI::ERRORS_THROW_EXCEPTIONS with gcc in 32 bit (but not 64 bit!). 
 * Ensure that the C and Fortran compilers actually like the C++
   exceptions flags.  If not, currently just abort.  Let's see if
   anyone complains about this -- I doubt they will because a) C++
   exception support is not enabled by default, and b) I think C++
   exceptions really only make sense within the same compiler family.

This commit was SVN r19783.

config/ompi_setup_cxx.m4

@@ -116,8 +116,24 @@ AC_DEFUN([OMPI_SETUP_CXX],[
         OMPI_CXX_FIND_EXCEPTION_FLAGS
         if test "$OMPI_CXX_EXCEPTIONS" = "1"; then
             HAVE_CXX_EXCEPTIONS=1
-            CFLAGS="$CFLAGS $OMPI_CXX_EXCEPTIONS_CFLAGS"
-            FFLAGS="$FFLAGS $OMPI_CXX_EXCEPTIONS_FFLAGS"
+
+            # Test to see if the C compiler likes these flags
+            AC_MSG_CHECKING([to see if C compiler likes the exception flags])
+            CFLAGS="$CFLAGS $OMPI_CXX_EXCEPTIONS_CXXFLAGS"
+            AC_LANG_SAVE
+            AC_LANG_C
+            AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[]], [[int i = 0;]]),
+                              [AC_MSG_RESULT([yes])],
+                              [AC_MSG_RESULT([no])
+                               AC_MSG_WARN([C++ exception flags are different between the C and C++ compilers; this configure script cannot currently handle this scenario.  Either disable C++ exception support or send mail to the Open MPI users list.])
+                               AC_MSG_ERROR([*** Cannot continue])])
+            AC_LANG_RESTORE
+
+            # We can't test the F77 and F90 compilers now because we
+            # haven't found/set the up yet.  So just save the flags
+            # and test them later (in ompi_setup_f77.m4 and
+            # ompi_setup_f90.m4).
+
             CXXFLAGS="$CXXFLAGS $OMPI_CXX_EXCEPTIONS_CXXFLAGS"
             LDFLAGS="$LDFLAGS $OMPI_CXX_EXCEPTIONS_LDFLAGS"
 

config/ompi_setup_f77.m4

@@ -108,6 +108,27 @@ directory.
 EOF
      AC_MSG_ERROR([C and Fortran 77 compilers are not link compatible.  Can not continue.])])])
 
+# Test to see if the F90 compilers likes the C++ exceptions flags.  If
+# it doesn't, just abort.  We *could* handle this scenario (e.g.,
+# probe the F90 compiler for what flags would be necessary), but we're
+# kinda assuming that no one will care.  If they do, they'll e-mail us.
+AC_MSG_CHECKING([to see if F77 compiler likes the C++ exception flags])
+if test $OMPI_WANT_F77_BINDINGS -eq 0; then
+    AC_MSG_RESULT([skipped (no F77 bindings)])
+elif test "$OMPI_CXX_EXCEPTIONS_CXXFLAGS" = ""; then
+    AC_MSG_RESULT([skipped (no C++ exceptions flags)])
+else
+    FFLAGS="$FFLAGS $OMPI_CXX_EXCEPTIONS_CXXFLAGS"
+    AC_LANG_PUSH(Fortran 77)
+    AC_COMPILE_IFELSE(AC_LANG_PROGRAM([], [[        INTEGER I
+        I = 3]]),
+                      [AC_MSG_RESULT([yes])],
+                      [AC_MSG_RESULT([no])
+                       AC_MSG_WARN([C++ exception flags are different between the C and C++ compilers; this configure script cannot currently handle this scenario.  Either disable C++ exception support or send mail to the Open MPI users list.])
+                       AC_MSG_ERROR([*** Cannot continue])])
+    AC_LANG_POP
+fi
+
 AC_DEFINE_UNQUOTED(OMPI_WANT_F77_BINDINGS, $OMPI_WANT_F77_BINDINGS,
     [Whether we want the MPI f77 bindings or not])
 AC_DEFINE_UNQUOTED(OMPI_F77, "$OMPI_F77", [OMPI underlying F77 compiler])

config/ompi_setup_f90.m4

@@ -172,6 +172,27 @@ AS_IF([test $OMPI_WANT_F90_BINDINGS -eq 1],
         AC_FC_SRCEXT(f90)
         AC_LANG_POP(Fortran)])
 
+# Test to see if the F90 compilers likes the C++ exceptions flags.  If
+# it doesn't, just abort.  We *could* handle this scenario (e.g.,
+# probe the F90 compiler for what flags would be necessary), but we're
+# kinda assuming that no one will care.  If they do, they'll e-mail us.
+AC_MSG_CHECKING([to see if F90 compiler likes the C++ exception flags])
+if test "$OMPI_WANT_F90_BINDINGS" = "0"; then
+    AC_MSG_RESULT([skipped (no F90 bindings)])
+elif test "$OMPI_CXX_EXCEPTIONS_CXXFLAGS" = ""; then
+    AC_MSG_RESULT([skipped (no C++ exceptions flags)])
+else
+    FCFLAGS="$FFLAGS $OMPI_CXX_EXCEPTIONS_CXXFLAGS"
+    AC_LANG_PUSH(Fortran)
+    AC_COMPILE_IFELSE(AC_LANG_PROGRAM([], [[ INTEGER I
+ I = 3]]),
+                      [AC_MSG_RESULT([yes])],
+                      [AC_MSG_RESULT([no])
+                       AC_MSG_WARN([C++ exception flags are different between the C and C++ compilers; this configure script cannot currently handle this scenario.  Either disable C++ exception support or send mail to the Open MPI users list.])
+                       AC_MSG_ERROR([*** Cannot continue])])
+    AC_LANG_POP
+fi
+
 # All done -- save values
 AC_DEFINE_UNQUOTED(OMPI_WANT_F90_BINDINGS, $OMPI_WANT_F90_BINDINGS,
     [Whether we want the MPI f90 bindings or not])