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Use constexpr more with VC++ 2017 (#3707)

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* Use constexpr more with VC++ 2017

Chrome's official builds have over 170 dynamic initializers for
variables of the form *::TableStruct::aux. Defining
PROTOBUF_CONSTEXPR_VAR to be constexpr for VS 2017 gets rid of all of
these and saves about 10 KB of binary size.

* Update generated_message_table_driven.h

Restore accidentally deleted line.
This commit is contained in:
Bruce Dawson 2017-10-02 14:43:05 -07:00 committed by Feng Xiao
parent fc5aa5d910
commit 210be267fd
1 changed files with 2 additions and 1 deletions
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src/google/protobuf/generated_message_table_driven.h
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@ -44,7 +44,8 @@
// We require C++11 and Clang to use constexpr for variables, as GCC 4.8
// requires constexpr to be consistent between declarations of variables
// unnecessarily (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58541).
#ifdef __clang__
// VS 2017 Update 3 also supports this usage of constexpr.
#if defined(__clang__) || (defined(_MSC_VER) && _MSC_VER >= 1911)
#define PROTOBUF_CONSTEXPR_VAR constexpr
#else // !__clang__
#define PROTOBUF_CONSTEXPR_VAR