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Streamline the mentions of grep and FileCheck in TestingGuide.rst

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grep is now only mentioned once in a sentence that explicitly says it's
deprecated. For FileCheck, there's no reason to repeat part of the
documentation that exists in CommandGuide/FileCheck.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172835 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky 2013-01-18 19:01:34 +00:00
parent 8d3c9014f9
commit 317794939c
1 changed files with 7 additions and 37 deletions
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docs/TestingGuide.rst
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@ -231,33 +231,21 @@ what you can use in yours. The major differences are:
- You can't do ``2>&1``. That will cause :program:`lit` to write to a file
named ``&1``. Usually this is done to get stderr to go through a pipe. You
can do that with ``|&`` so replace this idiom:
``... 2>&1 | grep`` with ``... |& grep``
``... 2>&1 | FileCheck`` with ``... |& FileCheck``
- You can only redirect to a file, not to another descriptor and not
from a here document.
There are some quoting rules that you must pay attention to when writing
your RUN lines. In general nothing needs to be quoted. :program:`lit` won't
strip off any quote characters so they will get passed to the invoked program.
For example:
.. code-block:: bash
... | grep 'find this string'
This will fail because the ``'`` characters are passed to ``grep``. This would
make ``grep`` to look for ``'find`` in the files ``this`` and
``string'``. To avoid this use curly braces to tell :program:`lit` that it
should treat everything enclosed as one value. So our example would become:
.. code-block:: bash
... | grep {find this string}
To avoid this use curly braces to tell :program:`lit` that it should treat
everything enclosed as one value.
In general, you should strive to keep your RUN lines as simple as possible,
using them only to run tools that generate the output you can then examine. The
recommended way to examine output to figure out if the test passes it using the
:doc:`FileCheck tool <CommandGuide/FileCheck>`. The usage of ``grep`` in RUN
lines is discouraged.
using them only to run tools that generate textual output you can then examine.
The recommended way to examine output to figure out if the test passes it using
the :doc:`FileCheck tool <CommandGuide/FileCheck>`. *[The usage of grep in RUN
lines is deprecated - please do not send or commit patches that use it.]*
Fragile tests
-------------
@ -296,24 +284,6 @@ This test will fail if placed into a ``download`` directory.
To make your tests robust, always use ``opt ... < %s`` in the RUN line.
:program:`opt` does not output a ``ModuleID`` when input comes from stdin.
The FileCheck utility
---------------------
A powerful feature of the RUN lines is that it allows any arbitrary
commands to be executed as part of the test harness. While standard
(portable) unix tools like ``grep`` work fine on run lines, as you see
above, there are a lot of caveats due to interaction with shell syntax,
and we want to make sure the run lines are portable to a wide range of
systems. Another major problem is that ``grep`` is not very good at checking
to verify that the output of a tools contains a series of different
output in a specific order. The :program:`FileCheck` tool was designed to
help with these problems.
:program:`FileCheck` is designed to read a file to check from standard input,
and the set of things to verify from a file specified as a command line
argument. :program:`FileCheck` is described in :doc:`the FileCheck man page
<CommandGuide/FileCheck>`.
Variables and substitutions
---------------------------