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

[Matthias Braun via llvm-dev]

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

> On Aug 2, 2017, at 4:22 PM, don hinton via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Btw, this works on *nix type systems, but I'm not sure about Windows.
> 
> 
> On Wed, Aug 2, 2017 at 4:06 PM, don hinton <hintonda at gmail.com <mailto:hintonda at gmail.com>> wrote:
> 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: {{^[0-9]+$}}
> // INVERSE: some_arg 
> 
> thanks...
> don
> 
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