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Fix usage of USE_RTTI flag in CMakeLists. (#9760)

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Summary:
By default, rocksdb release compiles with `-fno-rtti`. This causes issues when linking with other code that requires RTTI. Documentation indicate that setting the environment variable `USE_RTTI=1` when compiling rocksdb can override this behavior so that `-fno-rtti` is not used (http://rocksdb.org/blog/2017/09/28/rocksdb-5-8-released.html). However, this environment flag had no effect due to a bug in how `CMakeLists.txt` refers to `USE_RTTI`. This PR fixes this issue.

Now, running `USE_RTTI=1 cmake <......>` is correctly recognized by cmake, and causes `ROCKSDB_USE_RTTI `to be defined and `-fno-rtti` not to be issued for release builds. Behavior when USE_RTTI=0 or USE_RTTI is not provided is unchanged.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9760

Reviewed By: jay-zhuang

Differential Revision: D35334552

Pulled By: mrambacher

fbshipit-source-id: e405fcac4e14b246642e52bc7e73b04bf143e5b6
This commit is contained in:
Kinan Dak Albab 2022-04-12 12:12:23 -07:00 committed by Facebook GitHub Bot
parent 0b81efed1d
commit 1eee99fc8c
1 changed files with 20 additions and 18 deletions
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38
CMakeLists.txt
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@ -433,30 +433,32 @@ if (ASSERT_STATUS_CHECKED)
add_definitions(-DROCKSDB_ASSERT_STATUS_CHECKED)
endif()
if(DEFINED USE_RTTI)
if(USE_RTTI)
message(STATUS "Enabling RTTI")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DROCKSDB_USE_RTTI")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DROCKSDB_USE_RTTI")
else()
if(MSVC)
message(STATUS "Disabling RTTI in Release builds. Always on in Debug.")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DROCKSDB_USE_RTTI")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GR-")
else()
message(STATUS "Disabling RTTI in Release builds")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-rtti")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-rtti")
endif()
endif()
else()
# RTTI is by default AUTO which enables it in debug and disables it in release.
set(USE_RTTI AUTO CACHE STRING "Enable RTTI in builds")
set_property(CACHE USE_RTTI PROPERTY STRINGS AUTO ON OFF)
if(USE_RTTI STREQUAL "AUTO")
message(STATUS "Enabling RTTI in Debug builds only (default)")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DROCKSDB_USE_RTTI")
if(MSVC)
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GR-")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GR-")
else()
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-rtti")
endif()
elseif(USE_RTTI)
message(STATUS "Enabling RTTI in all builds")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DROCKSDB_USE_RTTI")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DROCKSDB_USE_RTTI")
else()
if(MSVC)
message(STATUS "Disabling RTTI in Release builds. Always on in Debug.")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DROCKSDB_USE_RTTI")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GR-")
else()
message(STATUS "Disabling RTTI in all builds")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-rtti")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-rtti")
endif()
endif()
# Used to run CI build and tests so we can run faster