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CMake: allow overriding CMAKE_CXX_VISIBILITY_PRESET

This allows overriding the `CMAKE_CXX_VISIBILITY_PRESET` on the command line. For example, setting the value to `default` lets PIC LLVM static libraries be converted to DSOs, without the need to rebuild LLVM with BUILD_SHARED_LIBS=ON.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D104168
This commit is contained in:
Wenlei He 2021-06-15 15:50:52 -07:00
parent 2685e7847d
commit 5b18faff1a

View File

@ -21,7 +21,8 @@ add_llvm_component_library(LLVMTarget
# When building shared objects for each target there are some internal APIs
# that are used across shared objects which we can't hide.
if (NOT BUILD_SHARED_LIBS AND NOT APPLE)
if (NOT BUILD_SHARED_LIBS AND NOT APPLE AND
NOT DEFINED CMAKE_CXX_VISIBILITY_PRESET)
# Set default visibility to hidden, so we don't export all the Target classes
# in libLLVM.so.
set(CMAKE_CXX_VISIBILITY_PRESET hidden)