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Target C++ 17 (#1327)

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Summary:
X-link: https://github.com/facebook/react-native/pull/38303

Pull Request resolved: https://github.com/facebook/yoga/pull/1327

This bumps Yoga to C++ 17 for a few reasons:
1. New versions of C++ may introduce behavior changes (e.g. evaluation order) and deprecations. Keeping the version closer to the version of large users helps avoid that.
2. C++ 17 unblocks some new bits I have wanted to use at times, like `std::optional`, `std::variant`, `if constexpr`, `[[nodiscard]]`.
3. There are already changes in C++ 20 that would be directly useful to Yoga, like `std::bit_cast` to avoid `memcpy` style type punning.

There has been some contention around C++ versions before, but by the time the next stable version of Yoga is out, it will have been more than 6 years (~2 C++ versions) since a stable version of Clang/LLVM with C++ 17 support. I would not like to go back further than n-2.

Changelog: [Internal]

Reviewed By: christophpurrer

Differential Revision: D47383922

fbshipit-source-id: eb95d4853f2168b68d6df5fddb797236eac55870
This commit is contained in:
Nick Gerleman
2023-07-12 09:38:40 -07:00
committed by Facebook GitHub Bot
parent dbd8e915d5
commit 423dc155d8
4 changed files with 4 additions and 4 deletions
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2
README.md
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@@ -4,7 +4,7 @@ Yoga is an embeddable and performant flexbox layout engine with bindings for mul
## Building
Yoga's main implementation targets C++ 14 with accompanying build logic in CMake. A wrapper is provided to build the main library and run unit tests.
Yoga's main implementation targets C++ 17 with accompanying build logic in CMake. A wrapper is provided to build the main library and run unit tests.
```sh
./unit_tests <Debug|Release>

2
Yoga.podspec
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@@ -32,7 +32,7 @@ Pod::Spec.new do |spec|
'-Wall',
'-Werror',
'-Wextra',
'-std=c++14',
'-std=c++17',
'-fPIC'
]
spec.source_files = 'yoga/**/*.{h,cpp}'

2
cmake/project-defaults.cmake
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@@ -3,7 +3,7 @@
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_VISIBILITY_PRESET hidden)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)

2
javascript/CMakeLists.txt
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@@ -14,7 +14,7 @@ file(GLOB SOURCES CONFIGURE_DEPENDS
include_directories(..)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD 17)
add_compile_definitions(
EMSCRIPTEN_HAS_UNBOUND_TYPE_NAMES=0)