fix some of the warning/errors clang 3.1 reports - 2

Test Plan:
fbconfig -r folly && fbmake opt -j32

to make sure gcc is still able to compile it

Reviewed By: tudorb@fb.com

FB internal diff: D678500

folly/AtomicHashMap.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2013 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -394,7 +394,7 @@ class AtomicHashMap : boost::noncopyable {
 
   SimpleRetT findInternal(const KeyT k) const;
 
-  SimpleRetT findAtInternal(const uint32_t idx) const;
+  SimpleRetT findAtInternal(uint32_t idx) const;
 
   std::atomic<SubMap*> subMaps_[kNumSubMaps_];
   std::atomic<uint32_t> numMapsAllocated_;

folly/experimental/exception_tracer/ExceptionTracer.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2013 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,8 +20,9 @@
 #ifndef FOLLY_EXPERIMENTAL_EXCEPTION_TRACER_EXCEPTIONTRACER_H_
 #define FOLLY_EXPERIMENTAL_EXCEPTION_TRACER_EXCEPTIONTRACER_H_
 
-#include <vector>
 #include <iostream>
+#include <typeinfo>
+#include <vector>
 
 namespace folly {
 namespace exception_tracer {

folly/experimental/exception_tracer/ExceptionTracerLib.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2013 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-
 #include <dlfcn.h>
 #include <pthread.h>
 #include <stdlib.h>
@@ -45,19 +44,22 @@ __thread StackTraceStack* caughtExceptions;
 pthread_once_t initialized = PTHREAD_ONCE_INIT;
 
 extern "C" {
-typedef void (*CxaThrowType)(void*, std::type_info*, void (*)(void));
+typedef void (*CxaThrowType)(void*, std::type_info*, void (*)(void))
+  __attribute__((noreturn));
 typedef void* (*CxaBeginCatchType)(void*);
-typedef void (*CxaRethrowType)(void);
+typedef void (*CxaRethrowType)(void)
+  __attribute__((noreturn));
 typedef void (*CxaEndCatchType)(void);
 
-CxaThrowType orig_cxa_throw __attribute__((noreturn));
+CxaThrowType orig_cxa_throw;
 CxaBeginCatchType orig_cxa_begin_catch;
-CxaRethrowType orig_cxa_rethrow __attribute__((noreturn));
+CxaRethrowType orig_cxa_rethrow;
 CxaEndCatchType orig_cxa_end_catch;
 }  // extern "C"
 
-typedef void (*RethrowExceptionType)(std::exception_ptr);
-RethrowExceptionType orig_rethrow_exception __attribute__((noreturn));
+typedef void (*RethrowExceptionType)(std::exception_ptr)
+  __attribute__((noreturn));
+RethrowExceptionType orig_rethrow_exception;
 
 void initialize() {
   orig_cxa_throw = (CxaThrowType)dlsym(RTLD_NEXT, "__cxa_throw");

folly/experimental/test/GenTest.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2013 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -251,8 +251,8 @@ TEST(Gen, OrderTake) {
 
 TEST(Gen, MinBy) {
   EXPECT_EQ(7, seq(1, 10)
-             | minBy([](int i) {
-                 auto d = i - 6.8;
+             | minBy([](int i) -> double {
+                 double d = i - 6.8;
                  return d * d;
                }));
 }

folly/test/DynamicConverterTest.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2013 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,8 @@
 // @author Nicholas Ormrod <njormrod@fb.com>
 
 #include "folly/DynamicConverter.h"
+
+#include <algorithm>
 #include <gtest/gtest.h>
 #include <gflags/gflags.h>
 #include "folly/Benchmark.h"
@@ -143,6 +145,7 @@ TEST(DynamicConverter, map_keyed_by_string) {
 TEST(DynamicConverter, map_to_vector_of_pairs) {
   dynamic d1 = dynamic::object("1", "one")("2", "two");
   auto i1 = convertTo<std::vector<std::pair<std::string, std::string>>>(d1);
+  std::sort(i1.begin(), i1.end());
   decltype(i1) i1b = { { "1", "one" }, { "2", "two" } };
   EXPECT_EQ(i1, i1b);
 }