Remove CXX_STD and inherit CMAKE_CXX_STANDARD from parent project #2005
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The comment states that "We don't use CMAKE_CXX_STANDARD [...]", however, the toplevel CMakeLists.txt sets `CMAKE_CXX_STANDARD`, which makes the use of `CXX_STD` redundant. When checking the actual compiler invocation, two distinct `-std=` options are passed to the compiler as a result.
This allows projects that include folly through `add_subdirectory` to be built with a different (newer) standard and have folly inherit the standard from the parent project.
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eugene536
reviewed
Jul 8, 2023
| set(CMAKE_CXX_STANDARD 17) | ||
| set(CMAKE_CXX_STANDARD_REQUIRED ON) | ||
| if(NOT CMAKE_CXX_STANDARD) | ||
| set(CMAKE_CXX_STANDARD 17) |
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fwiw) we can set CMAKE_CXX_STANDARD as a CACHE variable and remove the if
set(CMAKE_CXX_STANDARD "17" CACHE STRING "folly C++ standard")
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@Orvid has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator. |
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Summary: This follows up on a discussion in facebook/folly#1949 and the comment by ot that the C++ standard for folly should be (easily) settable by a parent project. There are two commits in this PR: - The first commit removes the redundant `CXX_STD`, which causes `-std=` to be passed to the compiler twice. - The second commit introduces a check before setting `CMAKE_CXX_STANDARD`, so a value set by a parent project won't be overridden. X-link: facebook/folly#2005 Reviewed By: Gownta Differential Revision: D47343926 Pulled By: Orvid fbshipit-source-id: a712d117a6d6e2d125ee71f5f8d47ee5ceb3106b
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This follows up on a discussion in #1949 and the comment by @ot that the C++ standard for folly should be (easily) settable by a parent project.
There are two commits in this PR:
CXX_STD, which causes-std=to be passed to the compiler twice.CMAKE_CXX_STANDARD, so a value set by a parent project won't be overridden.