[libunwind] unw_* alias fixes for ELF and Mach-O
Rename the CMake option, LIBUNWIND_HERMETIC_STATIC_LIBRARY, to
LIBUNWIND_HIDE_SYMBOLS. Rename the C macro define,
_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS, to _LIBUNWIND_HIDE_SYMBOLS,
because now the macro adds a .hidden directive rather than merely
suppress visibility annotations.
For ELF, when LIBUNWIND_HIDE_SYMBOLS is enabled, mark unw_getcontext as
hidden. This symbol is the only one defined using src/assembly.h's
WEAK_ALIAS macro. Other unw_* weak aliases are defined in C++ and are
already hidden.
Mach-O doesn't support weak aliases, so remove .weak_reference and
weak_import. When LIBUNWIND_HIDE_SYMBOLS is enabled, output
.private_extern for the unw_* aliases.
In assembly.h, add missing SYMBOL_NAME macro invocations, which are
used to prefix symbol names with '_' on some targets.
Fixes PR46709.
Reviewed By: #libunwind, phosek, compnerd, steven_wu
Differential Revision: https://reviews.llvm.org/D93003
diff --git a/libunwind/CMakeLists.txt b/libunwind/CMakeLists.txt
index 1407000..628f0aa 100644
--- a/libunwind/CMakeLists.txt
+++ b/libunwind/CMakeLists.txt
@@ -102,7 +102,7 @@
message(FATAL_ERROR "LIBUNWIND_BUILD_32_BITS=ON is not supported on this platform.")
endif()
-option(LIBUNWIND_HERMETIC_STATIC_LIBRARY
+option(LIBUNWIND_HIDE_SYMBOLS
"Do not export any symbols from the static library." OFF)
#===============================================================================
@@ -321,7 +321,7 @@
# Disable DLL annotations on Windows for static builds.
if (WIN32 AND LIBUNWIND_ENABLE_STATIC AND NOT LIBUNWIND_ENABLE_SHARED)
- add_definitions(-D_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS)
+ add_definitions(-D_LIBUNWIND_HIDE_SYMBOLS)
endif()
if (LIBUNWIND_HAS_COMMENT_LIB_PRAGMA)
