Apparently the applink code has to be linked into the test app rather than the lib

Author: absurdfarce

.github/workflows/test.yml

@@ -33,7 +33,6 @@ jobs:
         run: |
           mkdir build
           cd build
-          dir ${{ env.OPENSSL_APPLINK_DIR }}
           cmake -G "NMake Makefiles" -DCASS_BUILD_UNIT_TESTS=On -DCASS_OPENSSL_APPLINK=${{ env.OPENSSL_APPLINK_DIR }}/applink.c ..
           nmake
           ls .

src/CMakeLists.txt

@@ -13,11 +13,6 @@ endif()
 
 if(CASS_USE_OPENSSL)
   list(APPEND SOURCES ssl/ssl_openssl_impl.cpp ssl/ring_buffer_bio.cpp)
-  # Allow user to specify the location of applink.c.  Some Windows builds require this as an
-  # interface into OpenSSL BIO ops.  See https://docs.openssl.org/1.1.1/man3/OPENSSL_Applink/
-  if(WIN32 AND (NOT CASS_OPENSSL_APPLINK STREQUAL ""))
-    list(APPEND SOURCES "${CASS_OPENSSL_APPLINK}")
-  endif()
 else()
   list(APPEND SOURCES ssl/ssl_no_impl.cpp)
 endif()

tests/src/unit/CMakeLists.txt

@@ -21,6 +21,12 @@ source_group("Header Files" FILES ${UNIT_TESTS_INCLUDE_FILES})
 source_group("Source Files" FILES ${UNIT_TESTS_SOURCE_FILES})
 source_group("Source Files\\tests" FILES ${UNIT_TESTS_TESTS_SOURCE_FILES})
 
+if(CASS_USE_OPENSSL AND WIN32 AND (NOT CASS_OPENSSL_APPLINK STREQUAL ""))
+  # Allow user to specify the location of applink.c.  Some Windows builds require this as an
+  # interface into OpenSSL BIO ops.  See https://docs.openssl.org/1.1.1/man3/OPENSSL_Applink/
+  list(APPEND UNIT_TESTS_SOURCE_FILES "${CASS_OPENSSL_APPLINK}")
+endif()
+
 add_executable(cassandra-unit-tests
   ${MINIZIP_SOURCE_FILES}
   ${UNIT_TESTS_SOURCE_FILES}