folly, tao: don't impose C constraints on folly's Portability.h

Summary:
* folly/Portability.h: Move the definitions that Tao uses
into a new file, and include that new file here.
* folly/AddressSanitizer.h: New file.
* tao/server/config.h: Include that small new file, rather
than all of folly's Portability.h

Test Plan:
fbconfig -r tao/server &&
tao/server/tests/run_unit_tests.sh -d --save-log=log
For folly, watch the arc-run tests.

Reviewed By: pgriess@fb.com

FB internal diff: D1011800

@override-unit-failures

folly/CPortability.h

+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CPORTABILITY_H
+#define CPORTABILITY_H
+
+/* These definitions are in a separate file so that they
+ * may be included from C- as well as C++-based projects. */
+
+/* Define a convenience macro to test when address sanitizer is being used
+ * across the different compilers (e.g. clang, gcc) */
+#if defined(__clang__)
+# if __has_feature(address_sanitizer)
+#  define FOLLY_SANITIZE_ADDRESS 1
+# endif
+#elif defined (__GNUC__) && \
+      (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) || (__GNUC__ >= 5)) && \
+      __SANITIZE_ADDRESS__
+# define FOLLY_SANITIZE_ADDRESS 1
+#endif
+
+/* Define attribute wrapper for function attribute used to disable
+ * address sanitizer instrumentation. Unfortunately, this attribute
+ * has issues when inlining is used, so disable that as well. */
+#ifdef FOLLY_SANITIZE_ADDRESS
+# if defined(__clang__)
+#  if __has_attribute(__no_address_safety_analysis__)
+#   define FOLLY_DISABLE_ADDRESS_SANITIZER \
+      __attribute__((__no_address_safety_analysis__, __noinline__))
+#  elif __has_attribute(__no_sanitize_address__)
+#   define FOLLY_DISABLE_ADDRESS_SANITIZER \
+      __attribute__((__no_sanitize_address__, __noinline__))
+#  endif
+# elif defined(__GNUC__)
+#  define FOLLY_DISABLE_ADDRESS_SANITIZER \
+     __attribute__((__no_address_safety_analysis__, __noinline__))
+# endif
+#endif
+#ifndef FOLLY_DISABLE_ADDRESS_SANITIZER
+# define FOLLY_DISABLE_ADDRESS_SANITIZER
+#endif
+
+#endif

folly/Portability.h

@@ -25,6 +25,7 @@
 #include <features.h>
 #endif
 
+#include "CPortability.h"
 
 #if FOLLY_HAVE_SCHED_H
  #include <sched.h>
@@ -84,40 +85,6 @@ struct MaxAlign { char c; } __attribute__((aligned));
 # endif
 #endif
 
-
-/* Define a convenience macro to test when address sanitizer is being used
- * across the different compilers (e.g. clang, gcc) */
-#if defined(__clang__)
-# if __has_feature(address_sanitizer)
-#  define FOLLY_SANITIZE_ADDRESS 1
-# endif
-#elif defined (__GNUC__) && \
-      (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) || (__GNUC__ >= 5)) && \
-      __SANITIZE_ADDRESS__
-# define FOLLY_SANITIZE_ADDRESS 1
-#endif
-
-/* Define attribute wrapper for function attribute used to disable
- * address sanitizer instrumentation. Unfortunately, this attribute
- * has issues when inlining is used, so disable that as well. */
-#ifdef FOLLY_SANITIZE_ADDRESS
-# if defined(__clang__)
-#  if __has_attribute(__no_address_safety_analysis__)
-#   define FOLLY_DISABLE_ADDRESS_SANITIZER \
-      __attribute__((__no_address_safety_analysis__, __noinline__))
-#  elif __has_attribute(__no_sanitize_address__)
-#   define FOLLY_DISABLE_ADDRESS_SANITIZER \
-      __attribute__((__no_sanitize_address__, __noinline__))
-#  endif
-# elif defined(__GNUC__)
-#  define FOLLY_DISABLE_ADDRESS_SANITIZER \
-     __attribute__((__no_address_safety_analysis__, __noinline__))
-# endif
-#endif
-#ifndef FOLLY_DISABLE_ADDRESS_SANITIZER
-# define FOLLY_DISABLE_ADDRESS_SANITIZER
-#endif
-
 // It turns out that GNU libstdc++ and LLVM libc++ differ on how they implement
 // the 'std' namespace; the latter uses inline namepsaces. Wrap this decision
 // up in a macro to make forward-declarations easier.