AC_FC_LITERAL_BACKSLASH
Check whether the compiler regards the backslash character as an
escape character. The backslash is not in the Fortran character set,
so ISO-1539 does not specify how this is to be interpreted, but
many Unix Fortran compilers interpret '\n', for example,
as a newline, and '\\' as a single backslash. Many
Unix compilers have switches which allow you to choose between these
two modes.
This macro tests the behaviour of the currently selected compiler,
and defines FC_LITERAL_BACKSLASH to 1 if backslashes are
treated literally -- that is if '\\' is interpreted as a
pair of backslashes and thus that '\n' is
interpreted as a pair of characters rather than a newline.
Note that, if you simply want to have a character constant which contains a single backslash, then the following initialisation will do that for you without any need for this macro (thanks to Peter Draper).
* Printable backslash: some compilers need '\\' to get '\', which
* isn't a problem as Fortran will truncate the string '\\' to '\'
* on the occasions when that isn't needed.
CHARACTER * ( 1 ) CCD1__BKSLH
PARAMETER ( CCD1__BKSLH = '\\' )