Entry from Jonathan Thornburg

E12 I'm getting wierd syntax errors in Fortran code, with an extra
    garbage character (often $ or &) stuck in the middle of a CCTK_INFO()
    or CCTK_WARN() or CCTK_EQUALS() call after it has been processed.

    You have probably used Fortran (either 77 or 90) line continuation
    in a macro call

        c example of broken Fortran code fragment
        if      (CCTK_EQUALS(test,"on")) then
           test_state = 1
        else if (CCTK_EQUALS(test,
     $                       "off")) then
           test_state = 3
        end if

    The $ is in column 6 is the Fortran 77 standard way of doing
    a line continuation.  This doesn't work, because CCTK_EQUALS()
    is a macro, and macros use C lexical conventions (regardless of
    what language your code is written in).  To continue a line in a
    macro, use the same technique you would in C, i.e. put a backslash
    ( \ ) at the end of the line to be continued (note there must *not*
    be any whitespace after the \ !!).  For example, the above code
    should be written

        c example of valid Fortran code fragment
        if      (CCTK_EQUALS(test,"on")) then
           test_state = 1
        else if (CCTK_EQUALS(test, \
                             "off")) then
           test_state = 0
        end if


git-svn-id: http://svn.cactuscode.org/flesh/trunk@3125 17b73243-c579-4c4c-a9d2-2d5706c11dac

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