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[libcxxabi] Automatically use static libunwind when required

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If we attempt to use unwind_shared when LIBUNWIND_ENABLE_SHARED is OFF,
we'll get link errors. LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY
avoids that, but it seems redundant to have to specify it manually.
Automatically switch libunwind statically when its shared build is
disabled, which also matches compiler-rt [1].

[1] 71bfec762b/compiler-rt/CMakeLists.txt (L238-L240)

Reviewed By: #libc_abi, phosek

Differential Revision: https://reviews.llvm.org/D158789
This commit is contained in:
Shoaib Meenai 2023-08-24 15:49:54 -07:00
parent 2e53e15480
commit 3789c236bb
1 changed files with 2 additions and 1 deletions
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3
libcxxabi/src/CMakeLists.txt
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@ -160,7 +160,8 @@ include(WarningFlags)
add_library(cxxabi_shared_objects OBJECT EXCLUDE_FROM_ALL ${LIBCXXABI_SOURCES} ${LIBCXXABI_HEADERS})
cxx_add_warning_flags(cxxabi_shared_objects ${LIBCXXABI_ENABLE_WERROR} ${LIBCXXABI_ENABLE_PEDANTIC})
if (LIBCXXABI_USE_LLVM_UNWINDER)
if (LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY)
if (LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY OR
(DEFINED LIBUNWIND_ENABLE_SHARED AND NOT LIBUNWIND_ENABLE_SHARED))
target_link_libraries(cxxabi_shared_objects PUBLIC unwind_shared_objects) # propagate usage requirements
target_sources(cxxabi_shared_objects PUBLIC $<TARGET_OBJECTS:unwind_shared_objects>)
else()