Revert r142311, -mios-simulator-version-min does not work correctly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142322 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 12c263aad0..825a83d8b8 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -454,6 +454,35 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
   }
 }
 
+static inline StringRef SimulatorVersionDefineName() {
+  return "__IPHONE_OS_VERSION_MIN_REQUIRED";
+}
+
+/// \brief Parse the simulator version define:
+/// __IPHONE_OS_VERSION_MIN_REQUIRED=([0-9])([0-9][0-9])([0-9][0-9])
+// and return the grouped values as integers, e.g:
+//   __IPHONE_OS_VERSION_MIN_REQUIRED=40201
+// will return Major=4, Minor=2, Micro=1.
+static bool GetVersionFromSimulatorDefine(StringRef define,
+                                          unsigned &Major, unsigned &Minor,
+                                          unsigned &Micro) {
+  assert(define.startswith(SimulatorVersionDefineName()));
+  StringRef name, version;
+  llvm::tie(name, version) = define.split('=');
+  if (version.empty())
+    return false;
+  std::string verstr = version.str();
+  char *end;
+  unsigned num = (unsigned) strtol(verstr.c_str(), &end, 10);
+  if (*end != '\0')
+    return false;
+  Major = num / 10000;
+  num = num % 10000;
+  Minor = num / 100;
+  Micro = num % 100;
+  return true;
+}
+
 void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
   const OptTable &Opts = getDriver().getOpts();
 
@@ -462,6 +491,28 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
   Arg *iOSSimVersion = Args.getLastArg(
     options::OPT_mios_simulator_version_min_EQ);
 
+  // FIXME: HACK! When compiling for the simulator we don't get a
+  // '-miphoneos-version-min' to help us know whether there is an ARC runtime
+  // or not; try to parse a __IPHONE_OS_VERSION_MIN_REQUIRED
+  // define passed in command-line.
+  if (!iOSVersion) {
+    for (arg_iterator it = Args.filtered_begin(options::OPT_D),
+           ie = Args.filtered_end(); it != ie; ++it) {
+      StringRef define = (*it)->getValue(Args);
+      if (define.startswith(SimulatorVersionDefineName())) {
+        unsigned Major = 0, Minor = 0, Micro = 0;
+        if (GetVersionFromSimulatorDefine(define, Major, Minor, Micro) &&
+            Major < 10 && Minor < 100 && Micro < 100) {
+          ARCRuntimeForSimulator = Major < 5 ? ARCSimulator_NoARCRuntime
+                                             : ARCSimulator_HasARCRuntime;
+          LibCXXForSimulator = Major < 5 ? LibCXXSimulator_NotAvailable
+                                         : LibCXXSimulator_Available;
+        }
+        break;
+      }
+    }
+  }
+
   if (OSXVersion && (iOSVersion || iOSSimVersion)) {
     getDriver().Diag(diag::err_drv_argument_not_allowed_with)
           << OSXVersion->getAsString(Args)