Hi Jakub,
this version adjusts the patch to let sections/parallel sections also use
strictly-structured blocks, making it more towards 5.2.

Because of this change, some of the testcases using the sections-construct need
a bit of adjustment too, since "block; end block" at the start of the construct
now means something different than before.

There are now three new testcases, with the non-dg-error/dg-error cases separated,
and a third testcase containing a few cases listed in prior emails. I hope this is
enough.

The implementation status entry in libgomp/libgomp.texi for strictly-structured blocks
has also been changed to "Y" in this patch.

Tested without regressions, is this now okay for trunk?

Thanks,
Chung-Lin

2021-10-20  Chung-Lin Tang  <cltang@codesourcery.com>

gcc/fortran/ChangeLog:

	* decl.c (gfc_match_end): Add COMP_OMP_STRICTLY_STRUCTURED_BLOCK case
	together with COMP_BLOCK.
	* parse.c (parse_omp_structured_block): Change return type to
	'gfc_statement', add handling for strictly-structured block case, adjust
	recursive calls to parse_omp_structured_block.
	(parse_executable): Adjust calls to parse_omp_structured_block.
	* parse.h (enum gfc_compile_state): Add
	COMP_OMP_STRICTLY_STRUCTURED_BLOCK.
	* trans-openmp.c (gfc_trans_omp_workshare): Add EXEC_BLOCK case
	handling.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/cancel-1.f90: Adjust testcase.
	* gfortran.dg/gomp/nesting-3.f90: Adjust testcase.
	* gfortran.dg/gomp/strictly-structured-block-1.f90: New test.
	* gfortran.dg/gomp/strictly-structured-block-2.f90: New test.
	* gfortran.dg/gomp/strictly-structured-block-3.f90: New test.

libgomp/ChangeLog:

	* libgomp.texi (Support of strictly structured blocks in Fortran):
	Adjust to 'Y'.
	* testsuite/libgomp.fortran/task-reduction-16.f90: Adjust testcase.