https://bugs.llvm.org/show_bug.cgi?id=50237
Bug ID: 50237
Summary: hidden visibility with shared objects lead to subtle
bugs
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: Target Description Classes
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
We should not set CMAKE_CXX_VISIBILITY_PRESET to hidden for llvm Targets
Using this feature is error prone and interacts in subtle ways with the LLVM
codebase.
As an example, llvm::Any::TypeId::Id relies on the uniqueness of the address of
a
static variable defined in a template function. hidden visibility implies vague
linkage for that variable, which does not guarantee the uniqueness of the
address
across a binary and a shared library. This totally breaks the implementation of
llvm::Any.
See https://gcc.gnu.org/wiki/Visibility and
https://gcc.gnu.org/onlinedocs/gcc/Vague-Linkage.html
for more information on that topic.
Proposed patch: https://reviews.llvm.org/D101972
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