[PATCH] D112698: [flang] Implement GET_ENVIRONMENT_VARIABLE(VALUE)

[Diana Picus via Phabricator via llvm-commits]

rovka created this revision.
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Implement the second entry point for GET_ENVIRONMENT_VARIABLE. Reuse
existing bits and pieces wherever possible.

This patch also increases CFI_* error codes in order to avoid conflicts.
GET_ENVIRONMENT_VARIABLE is required to return a status of 1 if an
environment variable does not exist and 2 if environment variables are
not supported. However, if we add status codes for that they will
conflict with CFI_ERROR_BASE_ADDR_NULL and CFI_ERROR_BASE_ADDR_NOT_NULL,
which are also 1 and 2 at the moment. We therefore move all CFI error
codes up (an arbitrary) 10 spots to make room. Hopefully this isn't
a problem, since we weren't matching the CFI error codes that gfortran
uses anyway. It may still be an issue if any other runtime functions
will need to return a status of 1 or 2, but we should probably deal with
that when/if it occurs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D112698

Files:
  flang/include/flang/ISO_Fortran_binding.h
  flang/include/flang/Runtime/command.h
  flang/include/flang/Runtime/magic-numbers.h
  flang/runtime/command.cpp
  flang/runtime/stat.cpp
  flang/runtime/stat.h
  flang/unittests/Runtime/CommandTest.cpp

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