[ASan] Make -fsanitize=address imply -fsanitize=init-order (if the latter is not explicitly disabled).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177061 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/Tools.cpp

@@ -1483,6 +1483,8 @@ SanitizerArgs::SanitizerArgs(const Driver &D, const ArgList &Args)
       AsanZeroBaseShadow(false) {
   unsigned AllKinds = 0;  // All kinds of sanitizers that were turned on
                           // at least once (possibly, disabled further).
+  unsigned AllRemovedKinds = 0;  // All kinds of sanitizers that were explicitly
+                                 // removed at least once.
   for (ArgList::const_iterator I = Args.begin(), E = Args.end(); I != E; ++I) {
     unsigned Add, Remove;
     if (!parse(D, Args, *I, Add, Remove, true))
@@ -1491,6 +1493,12 @@ SanitizerArgs::SanitizerArgs(const Driver &D, const ArgList &Args)
     Kind |= Add;
     Kind &= ~Remove;
     AllKinds |= Add;
+    AllRemovedKinds |= Remove;
+  }
+  // Assume -fsanitize=address implies -fsanitize=init-order, if the latter is
+  // not disabled explicitly.
+  if ((Kind & Address) != 0 && (AllRemovedKinds & InitOrder) == 0) {
+    Kind |= InitOrder;
   }
 
   UbsanTrapOnError =

test/Driver/fsanitize.c

@@ -16,6 +16,12 @@
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=address-full %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-FULL
 // CHECK-ASAN-FULL: "-fsanitize={{((address|init-order|use-after-return|use-after-scope),?){4}"}}
 
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address %s -### 2>&1 |  FileCheck %s --check-prefix=CHECK-ASAN-IMPLIED-INIT-ORDER
+// CHECK-ASAN-IMPLIED-INIT-ORDER: "-fsanitize={{((address|init-order),?){2}"}}
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fno-sanitize=init-order %s -### 2>&1 |  FileCheck %s --check-prefix=CHECK-ASAN-NO-IMPLIED-INIT-ORDER
+// CHECK-ASAN-NO-IMPLIED-INIT-ORDER-NOT: init-order
+
 // RUN: %clang -target x86_64-linux-gnu -fcatch-undefined-behavior -fno-sanitize-undefined-trap-on-error %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-UNDEFINED-NO-TRAP-ERROR
 // CHECK-UNDEFINED-NO-TRAP-ERROR: '-fcatch-undefined-behavior' not allowed with '-fno-sanitize-undefined-trap-on-error'