[CarpetLib] add option to omit Fortran 90 files by adding -DOMIT_F90 to compiler flags

Carpet is _almost_ entirely written in C, C++, and Fortran 77, but
there are a few Fortran 90 files in CarpetLib defining the ENO and
WENO prolongation operators.  This patch allows Carpet to be compiled
without a Fortran 90 compiler if these (ENO/WENO) operators are not
needed, by defining the C preprocessor symbol OMIT_F90.  For example,
you could do this by putting
  CFLAGS=-DOMIT_F90
  CXXFLAGS=-DOMIT_F90
  F77FLAGS=-DOMIT_F90
  F90FLAGS=-DOMIT_F90
in a ~/.cactus/config file.

I emphasize that in the default case, where OMIT_F90 is not defined,
this patch is a no-op: the ENO and WENO prolongation operators are still
defined, a Fortran 90 compiler is still needed to compile CarpetLib, you
still pass go, you still collect $200. :)  This patch only changes the
behavior of Carpet in the non-default case where OMIT_F90 is defined.

darcs-hash:20060829170502-b0a3f-0d423f190bd7388faa9e1a6e0a980694b044516b.gz

1 files changed, 2 insertions, 0 deletions

diff --git a/Carpet/CarpetLib/src/prolongate_3d_real8_eno.F90 b/Carpet/CarpetLib/src/prolongate_3d_real8_eno.F90
index e5f1c53ae..105b06148 100644
--- a/Carpet/CarpetLib/src/prolongate_3d_real8_eno.F90
+++ b/Carpet/CarpetLib/src/prolongate_3d_real8_eno.F90
@@ -1,3 +1,4 @@
+#ifndef OMIT_F90
 !!$     -*-Fortran-*-
 
 #include "cctk.h"
@@ -291,3 +292,4 @@ subroutine prolongate_3d_real8_eno (src, srciext, srcjext, &
   end do
 
 end subroutine prolongate_3d_real8_eno
+#endif	/* !OMIT_F90 */