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-rw-r--r--libcxx/cmake/Modules/HandleLibCXXABI.cmake2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcxx/cmake/Modules/HandleLibCXXABI.cmake b/libcxx/cmake/Modules/HandleLibCXXABI.cmake
index 54b1e128617..ef3b4f5dde2 100644
--- a/libcxx/cmake/Modules/HandleLibCXXABI.cmake
+++ b/libcxx/cmake/Modules/HandleLibCXXABI.cmake
@@ -48,7 +48,7 @@ macro(setup_abi_lib abidefines abilib abifiles abidirs)
COMMENT "Copying C++ ABI header ${fpath}...")
list(APPEND abilib_headers "${dst}")
- if (NOT LIBCXX_USING_INSTALLED_LLVM)
+ if (NOT LIBCXX_USING_INSTALLED_LLVM AND LIBCXX_HEADER_DIR)
set(dst "${LIBCXX_HEADER_DIR}/include/c++/v1/${dstdir}/${fpath}")
add_custom_command(OUTPUT ${dst}
DEPENDS ${src}
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