check if EXTRA_EXPORT is set, fix cmake builds on OpenBSD

1 files changed, 6 insertions, 4 deletions

diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 45765d4..38c0b27 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -785,10 +785,12 @@ foreach(SYM IN LISTS CRYPTO_UNEXPORT)
         string(REPLACE "${SYM}\n" "" SYMS ${SYMS})
 endforeach()
 file(WRITE ${CMAKE_CURRENT_SOURCE_DIR}/crypto_p.sym ${SYMS})
-list(SORT EXTRA_EXPORT)
-foreach(SYM IN LISTS EXTRA_EXPORT)
-        file(APPEND ${CMAKE_CURRENT_SOURCE_DIR}/crypto_p.sym "${SYM}\n")
-endforeach()
+if(EXTRA_EXPORT)
+        list(SORT EXTRA_EXPORT)
+        foreach(SYM IN LISTS EXTRA_EXPORT)
+                file(APPEND ${CMAKE_CURRENT_SOURCE_DIR}/crypto_p.sym "${SYM}\n")
+        endforeach()
+endif()
 
 add_library(crypto-objects OBJECT ${CRYPTO_SRC})
 if (BUILD_SHARED)