libgomp.fortran/map-subarray-6.f90: Fix and robustify
Fixed and improved the `map-subarray-6.f90` test in libgomp.fortran, addressing initialization issues and adding more checks for pointer handling.
This commit addresses issues within the map-subarray-6.f90 test in libgomp.fortran. The changes include correctly initializing variables, explicitly handling different mapping scenarios (self-mapping, host accessibility), and adding checks to prevent pointer attaching using values outside the mapped range. These fixes and enhancements improve the robustness and reliability of the test, ensuring proper behavior in various scenarios.
In Details
This patch modifies the map-subarray-6.f90 test in libgomp.fortran to address initialization issues and improve robustness. The changes involve correctly initializing variables and adding explicit handling for self-mapping/host fallback scenarios, as well as checks for pointer attaching using values outside the mapped range. The patch also handles cases where 'tgt' is removed during gimplification.
For Context
Libgomp is GCC's implementation of the OpenMP API, which provides a standardized way to write parallel programs. This commit focuses on improving a specific test case for Fortran code that utilizes OpenMP's data mapping features, which control how data is shared between the main program and parallel regions. The changes ensure the test case is more reliable and handles different scenarios correctly, contributing to the overall stability of the OpenMP implementation in GCC.