[Order Files] On Darwin use DTrace's oneshot probe

The oneshot probe only gets executed the first time the probe is hit in the process. For order file generation this is really all we care about.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@279673 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/perf-training/order-files.lit.cfg b/utils/perf-training/order-files.lit.cfg
index 75501f8c629799a22fe37f0394d87aa800431803..e38d264595b635ec09ae5f2a0344ca1d911bc7a6 100644 (file)
--- a/utils/perf-training/order-files.lit.cfg
+++ b/utils/perf-training/order-files.lit.cfg
@@ -30,6 +30,11 @@ config.suffixes = ['.c', '.cpp', '.m', '.mm', '.cu', '.ll', '.cl', '.s', '.S', '
 dtrace_wrapper = '%s %s/perf-helper.py dtrace' % (config.python_exe, config.test_source_root)
 dtrace_wrapper_cc1 = '%s %s/perf-helper.py dtrace --cc1' % (config.python_exe, config.test_source_root)
 
+if 'darwin' in config.target_triple:
+    lit_config.note('using DTrace oneshot probe')
+    dtrace_wrapper = '%s --use-oneshot' % dtrace_wrapper
+    dtrace_wrapper_cc1 = '%s --use-oneshot' % dtrace_wrapper_cc1
+
 use_lit_shell = os.environ.get("LIT_USE_INTERNAL_SHELL")
 config.test_format = lit.formats.ShTest(use_lit_shell == "0")
 config.substitutions.append( ('%clang_cpp_skip_driver', ' %s %s --driver-mode=cpp %s ' % (dtrace_wrapper_cc1, config.clang, sysroot_flags)))