From 2e1afe5232674cab6edf1efefd0c8c88fb63a594 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Mon, 6 Apr 2020 10:47:41 -0400
Subject: [PATCH] try to fix tsan bot

---
 llvm/utils/llvm-lit/CMakeLists.txt | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/llvm/utils/llvm-lit/CMakeLists.txt b/llvm/utils/llvm-lit/CMakeLists.txt
index 158d10988ffd..5c00f39ab4a5 100644
--- a/llvm/utils/llvm-lit/CMakeLists.txt
+++ b/llvm/utils/llvm-lit/CMakeLists.txt
@@ -13,13 +13,15 @@ if("${CMAKE_CFG_INTDIR}" STREQUAL ".")
 endif()
 
 set(LLVM_LIT_CONFIG_MAP "${LLVM_LIT_PATH_FUNCTION}\n")
-foreach(i RANGE 0 ${file_last} 2)
-  list(GET LLVM_LIT_CONFIG_FILES ${i} main_config)
-  math(EXPR i1 "${i} + 1")
-  list(GET LLVM_LIT_CONFIG_FILES ${i1} site_out)
-  set(map "map_config(path('${main_config}'), path('${site_out}'))")
-  set(LLVM_LIT_CONFIG_MAP "${LLVM_LIT_CONFIG_MAP}\n${map}")
-endforeach()
+if (${file_last} GREATER -1)
+  foreach(i RANGE 0 ${file_last} 2)
+    list(GET LLVM_LIT_CONFIG_FILES ${i} main_config)
+    math(EXPR i1 "${i} + 1")
+    list(GET LLVM_LIT_CONFIG_FILES ${i1} site_out)
+    set(map "map_config(path('${main_config}'), path('${site_out}'))")
+    set(LLVM_LIT_CONFIG_MAP "${LLVM_LIT_CONFIG_MAP}\n${map}")
+  endforeach()
+endif()
 
 set(LLVM_SOURCE_DIR ${LLVM_MAIN_SRC_DIR})