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[flang][runtime] Add ACCESS library procedure (#88395)
This is a GNU extension: https://gcc.gnu.org/onlinedocs/gfortran/ACCESS.html Used in SALMON: https://salmon-tddft.jp/download.html Unfortunately the intrinsic takes a file path to operate on so there isn't an easy way to make the test robust. The unit test expects to be able to create, set read write and execute permissions, and delete files called `std::filesystem::temp_directory_path() / <test_name>.<pid>` The test will fail if a file already exists with that name. I have not implemented the intrinsic on Windows because this is wrapping a POSIX system call and Windows doesn't support all of the permission bits tested by the intrinsic. I don't have a Windows machine easily available to check if Gfortran implements this intrinsic on Windows.
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