Cut some outdated lines in docs and comments

Summary: [Folly] Cut some outdated lines in docs and comments which refer to no-longer supported versions of gcc.

Reviewed By: Orvid

Differential Revision: D19229059

fbshipit-source-id: c8abb81c292091339622e9cc3d4e5fd3cd6459b4

folly/docs/Benchmark.md

@@ -6,10 +6,6 @@ executing benchmarks. Currently the framework targets only
 single-threaded testing (though you can internally use fork-join
 parallelism and measure total run time).
 
-To use this library, you need to be using gcc 4.6 or later. Include
-`folly/Benchmark.h` and make sure `folly/benchmark.cpp` is part of the
-build (either directly or packaged with a library).
-
 ### Overview
 ***
 

folly/docs/Dynamic.md

@@ -8,9 +8,6 @@ C++, similar to the way languages with runtime type systems work
 `boost::variant`, but the syntax is intended to be a little more like
 using the native type directly.
 
-To use `dynamic`, you need to be using gcc 4.6 or later. You'll want to
-include `folly/dynamic.h` (or perhaps also `folly/json.h`).
-
 ### Overview
 ***
 

folly/docs/Format.md

@@ -9,9 +9,6 @@ and dynamically-typed `folly::dynamic` objects, and can extract values from
 random-access containers and string-keyed maps.  In many cases, `format` is
 faster than `sprintf` as well as being fully type-safe.
 
-To use `format`, you need to be using gcc 4.6 or later.  You'll want to include
-`folly/Format.h`.
-
 ### Overview
 ***
 

folly/gen/Combine-inl.h

@@ -194,8 +194,7 @@ class MergeTuples {
 
 } // namespace detail
 
-// TODO(mcurtiss): support zip() for N>1 operands. Because of variadic problems,
-// this might not be easily possible until gcc4.8 is available.
+// TODO(mcurtiss): support zip() for N>1 operands.
 template <
     class Source,
     class Zip = detail::Zip<typename std::decay<Source>::type>>

folly/test/ExpectedTest.cpp

@@ -549,8 +549,6 @@ class ContainsExpected {
 
 /**
  * Test that a class containing an Expected can be copy and move assigned.
- * This was broken under gcc 4.7 until assignment operators were explicitly
- * defined.
  */
 TEST(Expected, AssignmentContained) {
   {

folly/test/OptionalTest.cpp

@@ -715,8 +715,6 @@ class ContainsOptional {
 
 /**
  * Test that a class containing an Optional can be copy and move assigned.
- * This was broken under gcc 4.7 until assignment operators were explicitly
- * defined.
  */
 TEST(Optional, AssignmentContained) {
   {

folly/test/stl_tests/StlVectorTest.cpp

@@ -21,8 +21,6 @@
 This file contains an extensive STL compliance test suite for an STL vector
 implementation (such as FBVector).
 
-GCC 4.7 is required.
-
 */
 
 #if 0