Add a runtime diagnostics library for Clang's -fcatch-undefined-behavior.

llvm-svn: 165533

1 files changed, 7 insertions, 0 deletions

diff --git a/compiler-rt/lib/ubsan/lit_tests/Integer/negate-overflow.cpp b/compiler-rt/lib/ubsan/lit_tests/Integer/negate-overflow.cpp
new file mode 100644
index 00000000000..58f1b4870dd
--- /dev/null
+++ b/compiler-rt/lib/ubsan/lit_tests/Integer/negate-overflow.cpp
@@ -0,0 +1,7 @@
+// RUN: %clang -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s
+
+int main() {
+  -unsigned(-0x7fffffff - 1); // ok
+  // CHECK: negate-overflow.cpp:6:10: fatal error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
+  return -(-0x7fffffff - 1);
+}