New Issue: Use of outside variable (unexpectedly) gpuizes and fails later in codegen when 'CHPL_COMM=gasnet'

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1

20641, "stonea", "Use of outside variable (unexpectedly) gpuizes and fails later in codegen when 'CHPL_COMM=gasnet'", "2022-09-06T23:33:59Z"

The following errors out in an unexpected way when using CHP_COMM=gasnet:

use GPU;

var globalVar = 42;

proc usesOutsideVar() { return globalVar; }

on here.gpus[0] {
  foreach i in 0..10 {
    assertOnGpu();
    usesOutsideVar();
  }
}

foo.chpl:1: In module 'foo':
foo.chpl:3: error: Could not find C variable globalVar_chpl - perhaps it is a complex macro?
+ ./foo -nl 1

This is somewhat confusing as I would have expected the loop to fail to gpuize since it calls a function that uses an outside (global) variable. This is what happens when CHPL_COMM=none.

Even more fun this doesn't produce a non-zero error code (see: Erroring in gpu fork of compilation does not result in us returning a non-zero error code for chpl · Issue #20639 · chapel-lang/chapel · GitHub).