X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=docs%2FTestingGuide.rst;h=3463156495a9c85588789a942aaf68c0b3c7f302;hb=81ab23434402703603b7f99ca036f21c27c9c100;hp=f9222372c2afd6c5bc9bd622d74f024d60a06643;hpb=4b3ec1763c22130fb91380413a8c3ddbdf044c3e;p=oota-llvm.git

diff --git a/docs/TestingGuide.rst b/docs/TestingGuide.rst
index f9222372c2a..3463156495a 100644
--- a/docs/TestingGuide.rst
+++ b/docs/TestingGuide.rst
@@ -22,7 +22,7 @@ Requirements
 ============
 
 In order to use the LLVM testing infrastructure, you will need all of the
-software required to build LLVM, as well as `Python <http://python.org>`_ 2.5 or
+software required to build LLVM, as well as `Python <http://python.org>`_ 2.7 or
 later.
 
 LLVM testing infrastructure organization
@@ -240,6 +240,58 @@ The recommended way to examine output to figure out if the test passes is 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.]*
 
+Extra files
+-----------
+
+If your test requires extra files besides the file containing the ``RUN:``
+lines, the idiomatic place to put them is in a subdirectory ``Inputs``.
+You can then refer to the extra files as ``%S/Inputs/foo.bar``.
+
+For example, consider ``test/Linker/ident.ll``. The directory structure is
+as follows::
+
+  test/
+    Linker/
+      ident.ll
+      Inputs/
+        ident.a.ll
+        ident.b.ll
+
+For convenience, these are the contents:
+
+.. code-block:: llvm
+
+  ;;;;; ident.ll:
+
+  ; RUN: llvm-link %S/Inputs/ident.a.ll %S/Inputs/ident.b.ll -S | FileCheck %s
+
+  ; Verify that multiple input llvm.ident metadata are linked together.
+
+  ; CHECK-DAG: !llvm.ident = !{!0, !1, !2}
+  ; CHECK-DAG: "Compiler V1"
+  ; CHECK-DAG: "Compiler V2"
+  ; CHECK-DAG: "Compiler V3"
+
+  ;;;;; Inputs/ident.a.ll:
+
+  !llvm.ident = !{!0, !1}
+  !0 = metadata !{metadata !"Compiler V1"}
+  !1 = metadata !{metadata !"Compiler V2"}
+
+  ;;;;; Inputs/ident.b.ll:
+
+  !llvm.ident = !{!0}
+  !0 = metadata !{metadata !"Compiler V3"}
+
+For symmetry reasons, ``ident.ll`` is just a dummy file that doesn't
+actually participate in the test besides holding the ``RUN:`` lines.
+
+.. note::
+
+  Some existing tests use ``RUN: true`` in extra files instead of just
+  putting the extra files in an ``Inputs/`` directory. This pattern is
+  deprecated.
+
 Fragile tests
 -------------
 
@@ -304,8 +356,7 @@ For instance, on ``test/CodeGen/ARM``, the ``lit.local.cfg`` is:
 .. code-block:: python
 
   config.suffixes = ['.ll', '.c', '.cpp', '.test']
-  targets = set(config.root.targets_to_build.split())
-  if not 'ARM' in targets:
+  if not 'ARM' in config.root.targets:
     config.unsupported = True
 
 Other platform-specific tests are those that depend on a specific feature