[asan] Turn -fsanitize-address-use-after-scope on by default [compiler-rt part]
AddressSanitizer has an optional compile-time flag, -fsanitize-address-use-after-scope, which enables detection of use-after-scope bugs. We'd like to have this feature on by default, because it is already very well tested, it's used in several projects already (LLVM automatically enables it when using -DLLVM_USE_SANITIZER=Address), it's low overhead and there are no known issues or incompatibilities.
This patch enables use-after-scope by default via the Clang driver, where we set true as the default value for AsanUseAfterScope. This also causes the lifetime markers to be generated whenever fsanitize=address is used. This has some nice consequences, e.g. we now have line numbers for all local variables.
Differential Revision: https://reviews.llvm.org/D31479
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299175 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/asan/TestCases/use-after-scope.cc b/test/asan/TestCases/use-after-scope.cc
index d92dae6..4c5998a 100644
--- a/test/asan/TestCases/use-after-scope.cc
+++ b/test/asan/TestCases/use-after-scope.cc
@@ -1,6 +1,10 @@
// RUN: %clangxx_asan -O1 -fsanitize-address-use-after-scope %s -o %t && \
// RUN: not %run %t 2>&1 | FileCheck %s
+// -fsanitize-address-use-after-scope is now on by default:
+// RUN: %clangxx_asan -O1 %s -o %t && \
+// RUN: not %run %t 2>&1 | FileCheck %s
+
volatile int *p = 0;
int main() {
