update C++11 docs

BUG=skia:
NOTRY=true
DOCS_PREVIEW= https://skia.org/dev/contrib/c++11?cl=1263793002

Review URL: https://codereview.chromium.org/1263793002

diff --git a/site/dev/contrib/c++11.md b/site/dev/contrib/c++11.md
index 0df1506..a8fc11d 100644 (file)
--- a/site/dev/contrib/c++11.md
+++ b/site/dev/contrib/c++11.md
@@ -1,8 +1,8 @@
 C++11 in Skia
 =============
 
-Skia is exploring the use of C++11.  As a library, we are technically limited
-by what our clients support and what our build bots support.
+Skia uses C++11.  But as a library, we are technically limited by what our
+clients support and what our build bots support.
 
 Skia may also be limited by restrictions we choose put on ourselves.  This
 document is not concerned with C++11 policy in Skia, only its technical
@@ -10,7 +10,7 @@ feasibility.  This is about what we can use, a superset of what we may use.
 
 The gist:
 
--   C++11 the language as supported by GCC 4.4 or later is probably usable.
+-   C++11 the language as supported by GCC 4.7 or later is probably usable.
 -   If you break a bot, that feature is not usable.
 -   The C++11 standard library can't generally be used.
 -   Local statics are not thread safe.
@@ -39,12 +39,12 @@ not a weak link for C++11 language features.  Android's C++ standard library
 has always been a pain, but since we can't use it anyway (see Chrome), don't
 worry about it.
 
-Mozilla's current weak link is a minimum requirement of GCC 4.6.  Most features
+Mozilla's current weak link is a minimum requirement of GCC 4.7.  Most features
 marked in red on Mozilla's C++11 [feature
 matrix](https://developer.mozilla.org/en-US/docs/Using_CXX_in_Mozilla_code) are
-marked that way because they arrived in GCC 4.7 or GCC 4.8.  Their
-minimum-supported Clang and MSVC toolchains are great.  They also appear to ban
-the C++ standard library.
+marked that way because they arrived in GCC 4.8.  Their minimum-supported Clang
+and MSVC toolchains are great.  They also appear to ban the C++ standard
+library.
 
 Internal Google projects tend to support C++11 completely, including the
 full C++11 standard library.
@@ -59,10 +59,4 @@ bots use a recent toolchain from Android (see above), and our Chrome bots use
 Chrome's toolchains (see above).  I'm not exactly sure what our Chrome OS bots
 are using, but they've never been a problem.
 
-A few miscellaneous compile-only bots are actually our current overall weak link:
-
--   Our iOS builds are driven from a Mac 10.7 machine using some unknown old Clang.
-    Who knows how old that is or what it supports?  It's probably due for an update.
-
-If we were to eliminate the problems of iOS bots, our ability to
-use C++11 would match Mozilla's list nearly identically.
+I believe our bots' ability to use C++11 matches Mozilla's list nearly identically.