Avoid undefined behavior in signed integer negation. Patch by Ahmed Charles.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141905 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index c9cf249..4927e9a 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -121,7 +121,8 @@
raw_ostream &raw_ostream::operator<<(long N) {
if (N < 0) {
*this << '-';
- N = -N;
+ // Avoid undefined behavior on LONG_MIN with a cast.
+ N = -(unsigned long)N;
}
return this->operator<<(static_cast<unsigned long>(N));