[Bug fortran/33317] CSHIFT/EOSHIFT: Rejects optional dummy for DIM=

["jvdelisle at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from jvdelisle at gcc dot gnu dot org  2007-11-17 18:22 -------
The problem here is that when we resolve cshift and eoshift we convert dim from
a EXPR_VARIABLE to a EXPR_FUNCTION that converts the type to match up with the
runtime function.

Later in trans-expr.c, code is not built to test for NULL and set dim to the
default of 1 since dim is no longer a variable and there is nothing in
gfc_conv_function_call to handle it.  It is normally handled by
gfc_conv_missing_dummy.

Further complicating this, the conversion of type function, such as
convert_i8_i4 which gets simplified to a cast segfaults when dim is NULL.

I think the solution is to build the type conversion later in
gfc_conv_missing_dummy after building the test for NULL.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33317