can llvm-lit pass output of one RUN command as an argument to another RUN command

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1

Is there a way to do this with llvm-lit, i.e., use the equivalent of backticks?

foo takes a single argument, but doesn’t read from stdin.

// RUN foo some_arg > %t; FileCheck %s < %t
// RUN foo cat %t | FileCheck --check-prefix=INVERSE

// CHECK: {{[1]+$}}
// INVERSE: some_arg

thanks…
don

  1. 0-9 ↩︎

2

Btw, this works on *nix type systems, but I’m not sure about Windows.

3

lit run lines are written in posix shell. However as you suspect the situation on windows is special, lit comes with its own shell parser/interpreter which doesn’t support the full range of posix shell features. Glancing at the code in llvm/utils/lit/lit/ShUtils.sh I don’t see anything supporting command substitution.

  • Matthias
4

Thanks. I grep’d all the tests and found a few cases using xargs, i.e., “cat %t | xargs”. They don’t set windows as unsupported, so I’m going to try that.

thanks again…
don