InstrProf: lit.cfg magic for running tests from source

Implement magic in compiler-rt to enable llvm-lit to be invoked on the
source tree in lib/profile.  This relies on a paired commit in the llvm
tree that exposes a new built-in parameter.

<rdar://problem/16458307>

llvm-svn: 205263

compiler-rt/test/profile/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(PROFILE_LIT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+set(PROFILE_LIT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
 set(PROFILE_TEST_DEPS)
 if(NOT COMPILER_RT_STANDALONE_BUILD)

compiler-rt/test/profile/lit.cfg

@@ -8,6 +8,22 @@ config.name = 'Profile'
 # Setup source root.
 config.test_source_root = os.path.dirname(__file__)
 
+# Setup executable root.
+if hasattr(config, 'profile_lit_binary_dir') and \
+        config.profile_lit_binary_dir is not None:
+    config.test_exec_root = config.profile_lit_binary_dir
+
+# If the above check didn't work, we're probably in the source tree.  Use some
+# magic to re-execute from the build tree.
+if config.test_exec_root is None:
+    # The magic relies on knowing compilerrt_site_basedir.
+    compilerrt_basedir = lit_config.params.get('compilerrt_site_basedir', None)
+    if compilerrt_basedir:
+        site_cfg = os.path.join(compilerrt_basedir, 'profile', 'lit.site.cfg')
+        if os.path.exists(site_cfg):
+            lit_config.load_config(config, site_cfg)
+            raise SystemExit
+
 # Test suffixes.
 config.suffixes = ['.c', '.cc', '.cpp', '.m', '.mm', '.ll', '.test']
 

compiler-rt/test/profile/lit.site.cfg.in

@@ -1,6 +1,9 @@
 ## Autogenerated by LLVM/Clang configuration.
 # Do not edit!
 
+# Tool-specific config options.
+config.profile_lit_binary_dir = "@PROFILE_LIT_BINARY_DIR@"
+
 # Load common config for all compiler-rt lit tests.
 lit_config.load_config(config, "@COMPILER_RT_BINARY_DIR@/test/lit.common.configured")