void-packages/srcpkgs/llvm12/patches/libcxxabi-dl.patch

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Also link to -ldl to prevent undefined references.
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -73,6 +73,7 @@
endif()
add_library_flags_if(LIBCXXABI_HAS_C_LIB c)
+ add_library_flags_if(LIBCXXABI_HAS_C_LIB dl)
endif()
if (LIBCXXABI_USE_LLVM_UNWINDER)
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -745,6 +745,10 @@
target_link_libraries(${target} PRIVATE m)
endif()
+ if (LIBCXX_HAS_C_LIB)
+ target_link_libraries(${target} PRIVATE dl)
+ endif()
+
if (LIBCXX_HAS_RT_LIB)
target_link_libraries(${target} PRIVATE rt)
endif()