[driver] Fix unused argument warnings.

1. Don't short-circuit conditional statements that are checking flags.
Otherwise, the driver emits warnings about unused arguments.

2. -mkernel and -fapple-kext imply no exceptions, so claim exception related
 arguments now to avoid warnings about unused arguments.

rdar://11120518


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153478 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/Tools.cpp

@@ -1081,8 +1081,17 @@ static void addExceptionArgs(const ArgList &Args, types::ID InputType,
                              bool KernelOrKext, bool IsRewriter,
                              unsigned objcABIVersion,
                              ArgStringList &CmdArgs) {
-  if (KernelOrKext)
+  if (KernelOrKext) {
+    // -mkernel and -fapple-kext imply no exceptions, so claim exception related
+    // arguments now to avoid warnings about unused arguments.
+    Args.ClaimAllArgs(options::OPT_fexceptions);
+    Args.ClaimAllArgs(options::OPT_fno_exceptions);
+    Args.ClaimAllArgs(options::OPT_fobjc_exceptions);
+    Args.ClaimAllArgs(options::OPT_fno_objc_exceptions);
+    Args.ClaimAllArgs(options::OPT_fcxx_exceptions);
+    Args.ClaimAllArgs(options::OPT_fno_cxx_exceptions);
     return;
+  }
 
   // Exceptions are enabled by default.
   bool ExceptionsEnabled = true;
@@ -1965,9 +1974,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   Args.AddLastArg(CmdArgs, options::OPT_fvisibility_inlines_hidden);
 
   // -fhosted is default.
-  if (KernelOrKext || Args.hasFlag(options::OPT_ffreestanding,
-                                   options::OPT_fhosted,
-                                   false))
+  if (Args.hasFlag(options::OPT_ffreestanding, options::OPT_fhosted, false) ||
+      KernelOrKext)
     CmdArgs.push_back("-ffreestanding");
 
   // Forward -f (flag) options which we can pass directly.
@@ -2123,8 +2131,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-fno-elide-constructors");
 
   // -frtti is default.
-  if (KernelOrKext ||
-      !Args.hasFlag(options::OPT_frtti, options::OPT_fno_rtti))
+  if (!Args.hasFlag(options::OPT_frtti, options::OPT_fno_rtti) ||
+      KernelOrKext)
     CmdArgs.push_back("-fno-rtti");
 
   // -fshort-enums=0 is default for all architectures except Hexagon.
@@ -2145,12 +2153,12 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-fno-threadsafe-statics");
 
   // -fuse-cxa-atexit is default.
-  if (KernelOrKext ||
-    !Args.hasFlag(options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
-                  getToolChain().getTriple().getOS() != llvm::Triple::Cygwin &&
+  if (!Args.hasFlag(options::OPT_fuse_cxa_atexit,
+                    options::OPT_fno_use_cxa_atexit,
+                   getToolChain().getTriple().getOS() != llvm::Triple::Cygwin &&
                   getToolChain().getTriple().getOS() != llvm::Triple::MinGW32 &&
-                  getToolChain().getTriple().getArch() !=
-                  llvm::Triple::hexagon))
+              getToolChain().getTriple().getArch() != llvm::Triple::hexagon) ||
+      KernelOrKext)
     CmdArgs.push_back("-fno-use-cxa-atexit");
 
   // -fms-extensions=0 is default.