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[libc++abi] Improve error message when libunwind is missing from LLVM_ENABLE_RUNTIMES (#77991)

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This doesn't actually prevent the build from failing, but it provides a
better diagnostic that explains what is needed in order to fix the build.

Fixes #77846
Fixes #77843
This commit is contained in:
Louis Dionne 2024-01-15 10:16:32 -05:00 committed by GitHub
parent f112cafa1f
commit 48e5b5ea92
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libcxxabi/CMakeLists.txt
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@ -47,6 +47,9 @@ option(LIBCXXABI_ENABLE_ASSERTIONS "Enable assertions independent of build mode.
option(LIBCXXABI_ENABLE_PEDANTIC "Compile with pedantic enabled." OFF)
option(LIBCXXABI_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
option(LIBCXXABI_USE_LLVM_UNWINDER "Build and use the LLVM unwinder." ON)
if (LIBCXXABI_USE_LLVM_UNWINDER AND NOT "libunwind" IN_LIST LLVM_ENABLE_RUNTIMES)
message(FATAL_ERROR "LIBCXXABI_USE_LLVM_UNWINDER is set to ON, but libuwnind is not specified in LLVM_ENABLE_RUNTIMES.")
endif()
option(LIBCXXABI_ENABLE_STATIC_UNWINDER "Statically link the LLVM unwinder." OFF)
option(LIBCXXABI_USE_COMPILER_RT "Use compiler-rt instead of libgcc" OFF)
option(LIBCXXABI_ENABLE_THREADS "Build with threads enabled" ON)