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[CMake] : Add precompiled header support with FLATBUFFERS_ENABLE_PCH (#5827)

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* [CMake] : Add precompiled header support with FLATBUFFERS_ENABLE_PCH

FLATBUFFERS_ENABLE_PCH enable precompile headers support for 'flatbuffers' and 'flatc'. Default if OFF.
You need to set it to ON to make it work. 'cmake -DFLATBUFFERS_ENABLE_PCH=ON ..'
This will only work if CMake version is >= 3.16, because target_precompile_headers is used.
If CMake doesn't have target_precompile_headers, then nothing will happen.
This can speed up compilation time.
Precompiled header file for 'flatbuffers' is 'pch.h'
Precompiled header file for 'flatc' is 'flatc_pch.h'

* Enable FLATBUFFERS_ENABLE_PCH for VC 2017 and VS2019 builds

* [CMake]: Fix error in FLATBUFFERS_ENABLE_PCH description

* Add a function add_pch_to_target to avoid copy and pasting the same code like add_fsanitize_to_target
Move pch.h and flatc_pch.h from include/flatbuffers to include/flatbuffers/pch
Make flatc_pch.h depends on pch.h since it extend it
This commit is contained in:
Olivier Le Doeuff
2020-03-27 16:35:44 +01:00
committed by GitHub
parent e9d4532401
commit d9fecc3327
4 changed files with 102 additions and 0 deletions
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appveyor.yml
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@@ -28,10 +28,12 @@ environment:
- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
CMAKE_VS_VERSION: "15 2017"
CMAKE_OPTIONS: "-DFLATBUFFERS_ENABLE_PCH=1"
MONSTER_EXTRA: ""
- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
CMAKE_VS_VERSION: "16 2019"
CMAKE_OPTIONS: "-DFLATBUFFERS_ENABLE_PCH=1"
MONSTER_EXTRA: ""
platform: