[llvm] b52820e - [lit] Support reading arguments from a file

[Petr Hosek via llvm-commits]

Author: Petr Hosek
Date: 2022-08-24T08:01:58Z
New Revision: b52820edec6f3d95edef7859a56ef30878b08382

URL: https://github.com/llvm/llvm-project/commit/b52820edec6f3d95edef7859a56ef30878b08382
DIFF: https://github.com/llvm/llvm-project/commit/b52820edec6f3d95edef7859a56ef30878b08382.diff

LOG: [lit] Support reading arguments from a file

This allows reading arguments from file using the response file syntax.
We would like to use this in the LLVM build to pass test suites from
subbuilds.

Differential Revision: https://reviews.llvm.org/D132437

Added: 
    

Modified: 
    llvm/docs/CommandGuide/lit.rst
    llvm/utils/lit/lit/cl_arguments.py

Removed: 
    


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diff  --git a/llvm/docs/CommandGuide/lit.rst b/llvm/docs/CommandGuide/lit.rst
index cda6de4f0c8c9..31e272636bab8 100644
--- a/llvm/docs/CommandGuide/lit.rst
+++ b/llvm/docs/CommandGuide/lit.rst
@@ -43,6 +43,9 @@ parsing options from the command line.  ``LIT_OPTS`` is primarily useful for
 supplementing or overriding the command-line options supplied to :program:`lit`
 by ``check`` targets defined by a project's build system.
 
+:program:`lit` can also read options from response files which are specified as
+inputs using the ``@path/to/file.rsp`` syntax.
+
 Users interested in the :program:`lit` architecture or designing a
 :program:`lit` testing implementation should see :ref:`lit-infrastructure`.
 

diff  --git a/llvm/utils/lit/lit/cl_arguments.py b/llvm/utils/lit/lit/cl_arguments.py
index a7488774802fd..43bbd6fdaa96c 100644
--- a/llvm/utils/lit/lit/cl_arguments.py
+++ b/llvm/utils/lit/lit/cl_arguments.py
@@ -16,7 +16,7 @@ class TestOrder(enum.Enum):
 
 
 def parse_args():
-    parser = argparse.ArgumentParser(prog='lit')
+    parser = argparse.ArgumentParser(prog='lit', fromfile_prefix_chars='@')
     parser.add_argument('test_paths',
             nargs='+',
             metavar="TEST_PATH",