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-rw-r--r--test/lit.site.cfg.in4
1 files changed, 4 insertions, 0 deletions
diff --git a/test/lit.site.cfg.in b/test/lit.site.cfg.in
index 9ef21489..6bb0e297 100644
--- a/test/lit.site.cfg.in
+++ b/test/lit.site.cfg.in
@@ -21,6 +21,10 @@ config.llvmgxx = "@LLVMCXX@"
 config.cc = "@NATIVE_CC@"
 config.cxx = "@NATIVE_CXX@"
 
+config.O0opt = "-O0"
+if @LLVM_VERSION_MAJOR@ >= 5:
+  config.O0opt += " -Xclang -disable-O0-optnone"
+
 # Features
 config.enable_uclibc = True if @ENABLE_UCLIBC@ == 1 else False
 config.enable_posix_runtime = True if @ENABLE_POSIX_RUNTIME@ == 1 else False