From 00a665751d0fc185b8470cd300f3f9d830575ccf Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Thu, 1 Oct 2009 13:33:33 +0000
Subject: [PATCH] Move the "needs exception support" logic to clang. This also
 fixes -fno-exceptions in C++ code. We used to always define __EXCEPTIONS in
 C++.

llvm-svn: 83199
---
 clang/lib/Driver/Tools.cpp              | 38 +++++++++++++++++++------
 clang/lib/Frontend/InitPreprocessor.cpp |  5 ++--
 2 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 1044e0229270..ac7df866d743 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -472,6 +472,31 @@ void Clang::AddX86TargetArgs(const ArgList &Args,
   }
 }
 
+static bool needsExceptions(const ArgList &Args,  types::ID InputType) {
+  if (Arg *A = Args.getLastArg(options::OPT_fexceptions,
+                               options::OPT_fno_exceptions)) {
+    if (A->getOption().matches(options::OPT_fexceptions))
+      return true;
+    else
+      return false;
+  }
+  switch (InputType) {
+  case types::TY_CXX: case types::TY_CXXHeader:
+  case types::TY_PP_CXX: case types::TY_PP_CXXHeader:
+  case types::TY_ObjCXX: case types::TY_ObjCXXHeader:
+  case types::TY_PP_ObjCXX: case types::TY_PP_ObjCXXHeader:
+    return true;
+  case types::TY_ObjC: case types::TY_ObjCHeader:
+  case types::TY_PP_ObjC: case types::TY_PP_ObjCHeader:
+    if (Args.hasArg(options::OPT_fobjc_nonfragile_abi))
+      return true;
+    else
+      return false;
+  default:
+    return false;
+  }
+}
+
 void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                          Job &Dest,
                          const InputInfo &Output,
@@ -808,15 +833,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("-fblocks=0");
   }
 
-  // -fexceptions default varies depending on platform and language; only
-  // pass if specified.
- if (Arg *A = Args.getLastArg(options::OPT_fexceptions,
-                               options::OPT_fno_exceptions)) {
-    if (A->getOption().matches(options::OPT_fexceptions))
-      CmdArgs.push_back("-fexceptions");
-    else
-      CmdArgs.push_back("-fexceptions=0");
-  }
+  if (needsExceptions(Args, InputType))
+    CmdArgs.push_back("-fexceptions");
+  else
+    CmdArgs.push_back("-fexceptions=0");
 
   // -frtti is default, only pass non-default.
   if (!Args.hasFlag(options::OPT_frtti, options::OPT_fno_rtti))
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 6c8a8c190126..0f3b4b8236be 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -274,7 +274,6 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
     if (LangOpts.ObjCNonFragileABI) {
       DefineBuiltinMacro(Buf, "__OBJC2__=1");
       DefineBuiltinMacro(Buf, "OBJC_ZEROCOST_EXCEPTIONS=1");
-      DefineBuiltinMacro(Buf, "__EXCEPTIONS=1");
     }
 
     if (LangOpts.getGCMode() != LangOptions::NonGC)
@@ -299,9 +298,11 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
     DefineBuiltinMacro(Buf, "__BLOCKS__=1");
   }
 
+  if (LangOpts.Exceptions)
+    DefineBuiltinMacro(Buf, "__EXCEPTIONS=1");
+
   if (LangOpts.CPlusPlus) {
     DefineBuiltinMacro(Buf, "__DEPRECATED=1");
-    DefineBuiltinMacro(Buf, "__EXCEPTIONS=1");
     DefineBuiltinMacro(Buf, "__GNUG__=4");
     DefineBuiltinMacro(Buf, "__GXX_WEAK__=1");
     if (LangOpts.GNUMode)