[libcxxabi][CMake] Set --unwindlib=none when using LLVM libunwind
We already link libunwind explicitly so avoid trying to link toolchain's
default libunwind which may be missing. This matches what we already do
for libcxx.
Differential Revision: https://reviews.llvm.org/D129469
GitOrigin-RevId: 1f3f4833eae7ec276530ad0c0018d46a01563420
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a8c79aa..248acc6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -99,6 +99,13 @@
add_link_flags_if_supported(-nodefaultlibs)
endif()
+if (CXX_SUPPORTS_UNWINDLIB_EQ_NONE_FLAG AND LIBCXXABI_USE_LLVM_UNWINDER)
+ # If we're linking directly against the libunwind that we're building
+ # in the same invocation, don't try to link in the toolchain's
+ # default libunwind (which may be missing still).
+ add_link_flags_if_supported(--unwindlib=none)
+endif()
+
if ( APPLE )
if (LLVM_USE_SANITIZER)
if (("${LLVM_USE_SANITIZER}" STREQUAL "Address") OR
