Fortran/OpenACC: Permit PARAMETER as 'var' in clauses (+ ignore)

It turned out that other compilers permit (require?) named constants
to appear in clauses - and programs actually use this. OpenACC 3.4
added therefore the following:
  In this spec, a _var_ (in italics) is one of the following:
  ...
  * a named constant in Fortran.
plus
  If during an optimization phase _var_ is removed by the compiler,
  appearances of var in data clauses are ignored.

Thus, all errors related to PARAMETER are now downgraded, most
to a -Wsurprising warning, but for 'acc declare device_resident'
(which kind of makes sense), no warning is printed.

In trans-openmp.cc, those are ignored, unless I missed some code
path. (If so, I hope the middle end removes them; but before
removing them for the covered cases, the program just compiled &
linked fine.)

Note that 'ignore PARAMETER inside clauses' in trans-openmp.cc
would in principle also apply to expressions ('if (var)') but
those should be evaluated during 'resolve.cc' + 'openmp.cc' to
their (numeric, logical, string) value such that there should
be no issue.

gcc/fortran/ChangeLog:

	* invoke.texi (-Wsurprising): Note about OpenACC warning
	related to PARAMATER.
	* openmp.cc (resolve_omp_clauses, gfc_resolve_oacc_declare):
	Accept PARAMETER for OpenACC but add surprising warning.
	* trans-openmp.cc (gfc_trans_omp_variable_list,
	gfc_trans_omp_clauses): Ignore PARAMETER inside clauses.

gcc/testsuite/ChangeLog:

	* gfortran.dg/goacc/parameter.f95: Add -Wsurprising flag
	and update expected diagnostic.
	* gfortran.dg/goacc/parameter-3.f90: New test.
	* gfortran.dg/goacc/parameter-4.f90: New test.

0 files changed, 0 insertions, 0 deletions