https://llvm.org/bugs/show_bug.cgi?id=31932
Bug ID: 31932
Summary: PIC references to __dso_handle should behave as with
hidden visibility
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: rol...@hack.frob.com
CC: llvm-bugs@lists.llvm.org, pho...@chromium.org
Classification: Unclassified
When Clang emits calls to __cxa_atexit, it generates references to the symbol
__dso_handle. The sole purpose of this symbol is that it have a different
address in each linked module (shared library or the executable). To that end,
its definition is always made with hidden visibility. So using the GOT
indirection table in PIC mode just adds extra indirection overhead and an extra
dynamic reloc that will always be relaxed into a simple R_*_RELATIVE.
GCC emits references to __dso_handle that do not use the GOT.
I have a patch to fix this, though it might need some cleanup.
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