Make some Fortran features mandatory.

configure

@@ -6744,10 +6744,6 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-#
-# Optional features
-#
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking support for Fortran VOLATILE" >&5
 $as_echo_n "checking support for Fortran VOLATILE... " >&6; }
  ac_ext=${ac_fc_srcext-f}
@@ -6767,12 +6763,13 @@ _ACEOF
 if ac_fn_fc_try_compile "$LINENO"; then :
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-		      FDEFINES="$psblas_cv_define_prepend-DHAVE_VOLATILE $FDEFINES"
+		     :
 else
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 		     echo "configure: failed program was:" >&5
 		     cat conftest.$ac_ext >&5
+		      as_fn_error $? "Sorry, cannot build PSBLAS without support for	VOLATILE" "$LINENO" 5
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
@@ -6784,31 +6781,36 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking test GENERIC interfaces" >&5
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking support for Fortran FINAL" >&5
-$as_echo_n "checking test GENERIC interfaces... " >&6; }
+$as_echo_n "checking support for Fortran FINAL... " >&6; }
-ac_ext=${ac_fc_srcext-f}
+ ac_ext=${ac_fc_srcext-f}
 ac_compile='$FC -c $FCFLAGS $ac_fcflags_srcext conftest.$ac_ext >&5'
 ac_link='$FC -o conftest$ac_exeext $FCFLAGS $LDFLAGS $ac_fcflags_srcext conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_fc_compiler_gnu
 
  ac_exeext=''
- ac_ext='F90'
+ ac_ext='f90'
   ac_fc=${MPIFC-$FC};
  cat > conftest.$ac_ext <<_ACEOF
 
-module conftest
+module conftest_mod
-
+  type foo
-  interface foo
+    integer :: i
-    subroutine i_sub_foo(v)
+  contains
-      integer, intent(inout) :: v(:)
+    final  :: destroy_foo
-    end subroutine i_sub_foo
+  end type foo
-  end interface foo
-
-  interface bar
-    procedure i_sub_foo
-  end interface bar
 
-end module conftest
+  private destroy_foo
+contains
+  subroutine destroy_foo(a)
+    type(foo) :: a
+     ! Just a test
+  end subroutine destroy_foo
+end module conftest_mod
+program conftest
+  use conftest_mod
+  type(foo) :: foovar
+end program conftest
 _ACEOF
 if ac_fn_fc_try_compile "$LINENO"; then :
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
@@ -6819,7 +6821,7 @@ else
 $as_echo "no" >&6; }
 		     echo "configure: failed program was:" >&5
 		     cat conftest.$ac_ext >&5
-		      FDEFINES="$psblas_cv_define_prepend-DHAVE_BUGGY_GENERICS $FDEFINES"
+		      as_fn_error $? "Sorry, cannot build PSBLAS without support for FINAL" "$LINENO" 5
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
@@ -6831,35 +6833,48 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking support for Fortran FLUSH statement" >&5
+
-$as_echo_n "checking support for Fortran FLUSH statement... " >&6; }
+#
- ac_ext=${ac_fc_srcext-f}
+# Optional features
+#
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking test GENERIC interfaces" >&5
+$as_echo_n "checking test GENERIC interfaces... " >&6; }
+ac_ext=${ac_fc_srcext-f}
 ac_compile='$FC -c $FCFLAGS $ac_fcflags_srcext conftest.$ac_ext >&5'
 ac_link='$FC -o conftest$ac_exeext $FCFLAGS $LDFLAGS $ac_fcflags_srcext conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_fc_compiler_gnu
 
  ac_exeext=''
- ac_ext='f90'
+ ac_ext='F90'
   ac_fc=${MPIFC-$FC};
  cat > conftest.$ac_ext <<_ACEOF
 
-program conftest
+module conftest
-   integer :: iunit=10
+
-   open(10)
+  interface foo
-   write(10,*) 'Test '
+    subroutine i_sub_foo(v)
-   flush(10)
+      integer, intent(inout) :: v(:)
-   close(10)
+    end subroutine i_sub_foo
-end program conftest
+  end interface foo
+
+  interface bar
+    procedure i_sub_foo
+  end interface bar
+
+end module conftest
 _ACEOF
 if ac_fn_fc_try_compile "$LINENO"; then :
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-		      FDEFINES="$psblas_cv_define_prepend-DHAVE_FLUSH_STMT $FDEFINES"
+		     :
 else
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 		     echo "configure: failed program was:" >&5
 		     cat conftest.$ac_ext >&5
+		      FDEFINES="$psblas_cv_define_prepend-DHAVE_BUGGY_GENERICS $FDEFINES"
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
@@ -6871,9 +6886,8 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking support for Fortran FLUSH statement" >&5
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking support for Fortran FINAL" >&5
+$as_echo_n "checking support for Fortran FLUSH statement... " >&6; }
-$as_echo_n "checking support for Fortran FINAL... " >&6; }
  ac_ext=${ac_fc_srcext-f}
 ac_compile='$FC -c $FCFLAGS $ac_fcflags_srcext conftest.$ac_ext >&5'
 ac_link='$FC -o conftest$ac_exeext $FCFLAGS $LDFLAGS $ac_fcflags_srcext conftest.$ac_ext $LIBS >&5'
@@ -6884,29 +6898,18 @@ ac_compiler_gnu=$ac_cv_fc_compiler_gnu
   ac_fc=${MPIFC-$FC};
  cat > conftest.$ac_ext <<_ACEOF
 
-module conftest_mod
-  type foo
-    integer :: i
-  contains
-    final  :: destroy_foo
-  end type foo
-
-  private destroy_foo
-contains
-  subroutine destroy_foo(a)
-    type(foo) :: a
-     ! Just a test
-  end subroutine destroy_foo
-end module conftest_mod
 program conftest
-  use conftest_mod
+   integer :: iunit=10
-  type(foo) :: foovar
+   open(10)
+   write(10,*) 'Test '
+   flush(10)
+   close(10)
 end program conftest
 _ACEOF
 if ac_fn_fc_try_compile "$LINENO"; then :
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-		      FDEFINES="$psblas_cv_define_prepend-DHAVE_FINAL $FDEFINES"
+		      FDEFINES="$psblas_cv_define_prepend-DHAVE_FLUSH_STMT $FDEFINES"
 else
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -6923,6 +6926,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking support for Fortran SAME_TYPE_AS" >&5
 $as_echo_n "checking support for Fortran SAME_TYPE_AS... " >&6; }
  ac_ext=${ac_fc_srcext-f}

configure.ac

@@ -573,13 +573,21 @@ PAC_FORTRAN_TEST_ISO_FORTRAN_ENV(
  Please get a Fortran compiler that supports it, e.g. GNU Fortran 4.8.])]
 )
 
+PAC_FORTRAN_TEST_VOLATILE(
+	[],
+        [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for	VOLATILE])]	
+)
+
+PAC_FORTRAN_TEST_FINAL( 
+	[],
+        [AC_MSG_ERROR([Sorry, cannot build PSBLAS without support for FINAL])]	
+)
+
+
 #
 # Optional features
 #
 
-PAC_FORTRAN_TEST_VOLATILE( 
-	[FDEFINES="$psblas_cv_define_prepend-DHAVE_VOLATILE $FDEFINES"],
-)
 
 PAC_FORTRAN_TEST_GENERICS( 
 	[],
@@ -591,10 +599,6 @@ PAC_FORTRAN_TEST_FLUSH(
 )
 
 
-PAC_FORTRAN_TEST_FINAL( 
-	[FDEFINES="$psblas_cv_define_prepend-DHAVE_FINAL $FDEFINES"],
-)
-
 PAC_FORTRAN_TEST_SAME_TYPE( 
 	[FDEFINES="$psblas_cv_define_prepend-DHAVE_SAME_TYPE_AS $FDEFINES"],
 )